--- @meta _
--
-- DO NOT EDIT. GENERATED BY: src/gen/gen_eval_files.lua
--
error('Cannot require a meta file')

--- Return the absolute value of {expr}.  When {expr} evaluates to
--- a |Float| abs() returns a |Float|.  When {expr} can be
--- converted to a |Number| abs() returns a |Number|.  Otherwise
--- abs() gives an error message and returns -1.
--- Examples: >vim
---   echo abs(1.456)
--- <  1.456  >vim
---   echo abs(-5.456)
--- <  5.456  >vim
---   echo abs(-4)
--- <  4
---
--- @param expr number
--- @return number
function vim.fn.abs(expr) end

--- Return the arc cosine of {expr} measured in radians, as a
--- |Float| in the range of [0, pi].
--- {expr} must evaluate to a |Float| or a |Number| in the range
--- [-1, 1].
--- Returns NaN if {expr} is outside the range [-1, 1].  Returns
--- 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo acos(0)
--- <  1.570796 >vim
---   echo acos(-0.5)
--- <  2.094395
---
--- @param expr number
--- @return number
function vim.fn.acos(expr) end

--- Append the item {expr} to |List| or |Blob| {object}.  Returns
--- the resulting |List| or |Blob|.  Examples: >vim
---   let alist = add([1, 2, 3], item)
---   call add(mylist, "woodstock")
--- <Note that when {expr} is a |List| it is appended as a single
--- item.  Use |extend()| to concatenate |Lists|.
--- When {object} is a |Blob| then {expr} must be a number.
--- Use |insert()| to add an item at another position.
--- Returns 1 if {object} is not a |List| or a |Blob|.
---
--- @param object any
--- @param expr any
--- @return any # Resulting |List| or |Blob|, or 1 if {object} is not a |List| or a |Blob|.
function vim.fn.add(object, expr) end

--- Bitwise AND on the two arguments.  The arguments are converted
--- to a number.  A List, Dict or Float argument causes an error.
--- Also see |or()| and |xor()|.
--- Example: >vim
---   let flag = and(bits, 0x80)
--- <
---
--- @param expr number
--- @param expr1 number
--- @return integer
vim.fn['and'] = function(expr, expr1) end

--- Returns Dictionary of |api-metadata|.
---
--- View it in a nice human-readable format: >vim
---        lua vim.print(vim.fn.api_info())
--- <
---
--- @return table
function vim.fn.api_info() end

--- When {text} is a |List|: Append each item of the |List| as a
--- text line below line {lnum} in the current buffer.
--- Otherwise append {text} as one text line below line {lnum} in
--- the current buffer.
--- Any type of item is accepted and converted to a String.
--- {lnum} can be zero to insert a line before the first one.
--- {lnum} is used like with |getline()|.
--- Returns 1 for failure ({lnum} out of range or out of memory),
--- 0 for success.  When {text} is an empty list zero is returned,
--- no matter the value of {lnum}.  Example: >vim
---   let failed = append(line('$'), "# THE END")
---   let failed = append(0, ["Chapter 1", "the beginning"])
--- <
---
--- @param lnum integer|string
--- @param text string|string[]
--- @return 0|1
function vim.fn.append(lnum, text) end

--- Like |append()| but append the text in buffer {buf}.
---
--- This function works only for loaded buffers.  First call
--- |bufload()| if needed.
---
--- For the use of {buf}, see |bufname()|.
---
--- {lnum} is the line number to append below.  Note that using
--- |line()| would use the current buffer, not the one appending
--- to.  Use "$" to append at the end of the buffer.  Other string
--- values are not supported.
---
--- On success 0 is returned, on failure 1 is returned.
---
--- If {buf} is not a valid buffer or {lnum} is not valid, an
--- error message is given.  Example: >vim
---   let failed = appendbufline(13, 0, "# THE START")
--- <However, when {text} is an empty list then no error is given
--- for an invalid {lnum}, since {lnum} isn't actually used.
---
--- @param buf integer|string
--- @param lnum integer
--- @param text string
--- @return 0|1
function vim.fn.appendbufline(buf, lnum, text) end

--- The result is the number of files in the argument list.  See
--- |arglist|.
--- If {winid} is not supplied, the argument list of the current
--- window is used.
--- If {winid} is -1, the global argument list is used.
--- Otherwise {winid} specifies the window of which the argument
--- list is used: either the window number or the window ID.
--- Returns -1 if the {winid} argument is invalid.
---
--- @param winid? integer
--- @return integer
function vim.fn.argc(winid) end

--- The result is the current index in the argument list.  0 is
--- the first file.  |argc()| - 1 is the last one.  See |arglist|.
---
--- @return integer
function vim.fn.argidx() end

--- Return the argument list ID.  This is a number which
--- identifies the argument list being used.  Zero is used for the
--- global argument list.  See |arglist|.
--- Returns -1 if the arguments are invalid.
---
--- Without arguments use the current window.
--- With {winnr} only use this window in the current tab page.
--- With {winnr} and {tabnr} use the window in the specified tab
--- page.
--- {winnr} can be the window number or the |window-ID|.
---
--- @param winnr? integer
--- @param tabnr? integer
--- @return integer
function vim.fn.arglistid(winnr, tabnr) end

--- The result is the {nr}th file in the argument list.  See
--- |arglist|.  "argv(0)" is the first one.  Example: >vim
---   let i = 0
---   while i < argc()
---     let f = escape(fnameescape(argv(i)), '.')
---     exe 'amenu Arg.' .. f .. ' :e ' .. f .. '<CR>'
---     let i = i + 1
---   endwhile
--- <Without the {nr} argument, or when {nr} is -1, a |List| with
--- the whole |arglist| is returned.
---
--- The {winid} argument specifies the window ID, see |argc()|.
--- For the Vim command line arguments see |v:argv|.
---
--- Returns an empty string if {nr}th argument is not present in
--- the argument list.  Returns an empty List if the {winid}
--- argument is invalid.
---
--- @param nr? integer
--- @param winid? integer
--- @return string|string[]
function vim.fn.argv(nr, winid) end

--- Return the arc sine of {expr} measured in radians, as a |Float|
--- in the range of [-pi/2, pi/2].
--- {expr} must evaluate to a |Float| or a |Number| in the range
--- [-1, 1].
--- Returns NaN if {expr} is outside the range [-1, 1].  Returns
--- 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo asin(0.8)
--- <  0.927295 >vim
---   echo asin(-0.5)
--- <  -0.523599
---
--- @param expr any
--- @return number
function vim.fn.asin(expr) end

--- Run {cmd} and add an error message to |v:errors| if it does
--- NOT produce a beep or visual bell.
--- Also see |assert_fails()|, |assert_nobeep()| and
--- |assert-return|.
---
--- @param cmd string
--- @return 0|1
function vim.fn.assert_beeps(cmd) end

--- When {expected} and {actual} are not equal an error message is
--- added to |v:errors| and 1 is returned.  Otherwise zero is
--- returned. |assert-return|
--- The error is in the form "Expected {expected} but got
--- {actual}".  When {msg} is present it is prefixed to that,
--- along with the location of the assert when run from a script.
---
--- There is no automatic conversion, the String "4" is different
--- from the Number 4.  And the number 4 is different from the
--- Float 4.0.  The value of 'ignorecase' is not used here, case
--- always matters.
--- Example: >vim
---   call assert_equal('foo', 'bar', 'baz')
--- <Will add the following to |v:errors|: >
---   test.vim line 12: baz: Expected 'foo' but got 'bar'
--- <
---
--- @param expected any
--- @param actual any
--- @param msg? any
--- @return 0|1
function vim.fn.assert_equal(expected, actual, msg) end

--- When the files {fname_one} and {fname_two} do not contain
--- exactly the same text an error message is added to |v:errors|.
--- Also see |assert-return|.
--- When {fname_one} or {fname_two} does not exist the error will
--- mention that.
---
--- @param fname_one string
--- @param fname_two string
--- @return 0|1
function vim.fn.assert_equalfile(fname_one, fname_two) end

--- When v:exception does not contain the string {error} an error
--- message is added to |v:errors|.  Also see |assert-return|.
--- This can be used to assert that a command throws an exception.
--- Using the error number, followed by a colon, avoids problems
--- with translations: >vim
---   try
---     commandthatfails
---     call assert_false(1, 'command should have failed')
---   catch
---     call assert_exception('E492:')
---   endtry
--- <
---
--- @param error any
--- @param msg? any
--- @return 0|1
function vim.fn.assert_exception(error, msg) end

--- Run {cmd} and add an error message to |v:errors| if it does
--- NOT produce an error or when {error} is not found in the
--- error message.  Also see |assert-return|.
---
--- When {error} is a string it must be found literally in the
--- first reported error. Most often this will be the error code,
--- including the colon, e.g. "E123:". >vim
---   call assert_fails('bad cmd', 'E987:')
--- <
--- When {error} is a |List| with one or two strings, these are
--- used as patterns.  The first pattern is matched against the
--- first reported error: >vim
---   call assert_fails('cmd', ['E987:.*expected bool'])
--- <The second pattern, if present, is matched against the last
--- reported error.  To only match the last error use an empty
--- string for the first error: >vim
---   call assert_fails('cmd', ['', 'E987:'])
--- <
--- If {msg} is empty then it is not used.  Do this to get the
--- default message when passing the {lnum} argument.
---           *E1115*
--- When {lnum} is present and not negative, and the {error}
--- argument is present and matches, then this is compared with
--- the line number at which the error was reported. That can be
--- the line number in a function or in a script.
---           *E1116*
--- When {context} is present it is used as a pattern and matched
--- against the context (script name or function name) where
--- {lnum} is located in.
---
--- Note that beeping is not considered an error, and some failing
--- commands only beep.  Use |assert_beeps()| for those.
---
--- @param cmd string
--- @param error? any
--- @param msg? any
--- @param lnum? integer
--- @param context? any
--- @return 0|1
function vim.fn.assert_fails(cmd, error, msg, lnum, context) end

--- When {actual} is not false an error message is added to
--- |v:errors|, like with |assert_equal()|.
--- The error is in the form "Expected False but got {actual}".
--- When {msg} is present it is prefixed to that, along with the
--- location of the assert when run from a script.
--- Also see |assert-return|.
---
--- A value is false when it is zero. When {actual} is not a
--- number the assert fails.
---
--- @param actual any
--- @param msg? any
--- @return 0|1
function vim.fn.assert_false(actual, msg) end

--- This asserts number and |Float| values.  When {actual}  is lower
--- than {lower} or higher than {upper} an error message is added
--- to |v:errors|.  Also see |assert-return|.
--- The error is in the form "Expected range {lower} - {upper},
--- but got {actual}".  When {msg} is present it is prefixed to
--- that.
---
--- @param lower number
--- @param upper number
--- @param actual number
--- @param msg? string
--- @return 0|1
function vim.fn.assert_inrange(lower, upper, actual, msg) end

--- When {pattern} does not match {actual} an error message is
--- added to |v:errors|.  Also see |assert-return|.
--- The error is in the form "Pattern {pattern} does not match
--- {actual}".  When {msg} is present it is prefixed to that,
--- along with the location of the assert when run from a script.
---
--- {pattern} is used as with |expr-=~|: The matching is always done
--- like 'magic' was set and 'cpoptions' is empty, no matter what
--- the actual value of 'magic' or 'cpoptions' is.
---
--- {actual} is used as a string, automatic conversion applies.
--- Use "^" and "$" to match with the start and end of the text.
--- Use both to match the whole text.
---
--- Example: >vim
---   call assert_match('^f.*o$', 'foobar')
--- <Will result in a string to be added to |v:errors|: >
---   test.vim line 12: Pattern '^f.*o$' does not match 'foobar'
--- <
---
--- @param pattern string
--- @param actual string
--- @param msg? string
--- @return 0|1
function vim.fn.assert_match(pattern, actual, msg) end

--- Run {cmd} and add an error message to |v:errors| if it
--- produces a beep or visual bell.
--- Also see |assert_beeps()|.
---
--- @param cmd string
--- @return 0|1
function vim.fn.assert_nobeep(cmd) end

--- The opposite of `assert_equal()`: add an error message to
--- |v:errors| when {expected} and {actual} are equal.
--- Also see |assert-return|.
---
--- @param expected any
--- @param actual any
--- @param msg? any
--- @return 0|1
function vim.fn.assert_notequal(expected, actual, msg) end

--- The opposite of `assert_match()`: add an error message to
--- |v:errors| when {pattern} matches {actual}.
--- Also see |assert-return|.
---
--- @param pattern string
--- @param actual string
--- @param msg? string
--- @return 0|1
function vim.fn.assert_notmatch(pattern, actual, msg) end

--- Report a test failure directly, using String {msg}.
--- Always returns one.
---
--- @param msg string
--- @return 0|1
function vim.fn.assert_report(msg) end

--- When {actual} is not true an error message is added to
--- |v:errors|, like with |assert_equal()|.
--- Also see |assert-return|.
--- A value is |TRUE| when it is a non-zero number or |v:true|.
--- When {actual} is not a number or |v:true| the assert fails.
--- When {msg} is given it is prefixed to the default message,
--- along with the location of the assert when run from a script.
---
--- @param actual any
--- @param msg? string
--- @return 0|1
function vim.fn.assert_true(actual, msg) end

--- Return the principal value of the arc tangent of {expr}, in
--- the range [-pi/2, +pi/2] radians, as a |Float|.
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo atan(100)
--- <  1.560797 >vim
---   echo atan(-4.01)
--- <  -1.326405
---
--- @param expr number
--- @return number
function vim.fn.atan(expr) end

--- Return the arc tangent of {expr1} / {expr2}, measured in
--- radians, as a |Float| in the range [-pi, pi].
--- {expr1} and {expr2} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr1} or {expr2} is not a |Float| or a
--- |Number|.
--- Examples: >vim
---   echo atan2(-1, 1)
--- <  -0.785398 >vim
---   echo atan2(1, -1)
--- <  2.356194
---
--- @param expr1 number
--- @param expr2 number
--- @return number
function vim.fn.atan2(expr1, expr2) end

--- Return a List containing the number value of each byte in Blob
--- {blob}.  Examples: >vim
---   blob2list(0z0102.0304)  " returns [1, 2, 3, 4]
---   blob2list(0z)    " returns []
--- <Returns an empty List on error.  |list2blob()| does the
--- opposite.
---
--- @param blob any
--- @return any[]
function vim.fn.blob2list(blob) end

--- Put up a file requester.  This only works when "has("browse")"
--- returns |TRUE| (only in some GUI versions).
--- The input fields are:
---     {save}  when |TRUE|, select file to write
---     {title}  title for the requester
---     {initdir}  directory to start browsing in
---     {default}  default file name
--- An empty string is returned when the "Cancel" button is hit,
--- something went wrong, or browsing is not possible.
---
--- @param save any
--- @param title string
--- @param initdir string
--- @param default string
--- @return 0|1
function vim.fn.browse(save, title, initdir, default) end

--- Put up a directory requester.  This only works when
--- "has("browse")" returns |TRUE| (only in some GUI versions).
--- On systems where a directory browser is not supported a file
--- browser is used.  In that case: select a file in the directory
--- to be used.
--- The input fields are:
---     {title}  title for the requester
---     {initdir}  directory to start browsing in
--- When the "Cancel" button is hit, something went wrong, or
--- browsing is not possible, an empty string is returned.
---
--- @param title string
--- @param initdir string
--- @return 0|1
function vim.fn.browsedir(title, initdir) end

--- Add a buffer to the buffer list with name {name} (must be a
--- String).
--- If a buffer for file {name} already exists, return that buffer
--- number.  Otherwise return the buffer number of the newly
--- created buffer.  When {name} is an empty string then a new
--- buffer is always created.
--- The buffer will not have 'buflisted' set and not be loaded
--- yet.  To add some text to the buffer use this: >vim
---   let bufnr = bufadd('someName')
---   call bufload(bufnr)
---   call setbufline(bufnr, 1, ['some', 'text'])
--- <Returns 0 on error.
---
--- @param name string
--- @return integer
function vim.fn.bufadd(name) end

--- Checks whether a buffer with the name or number {buf} exists.
--- Returns |TRUE| if the buffer exists, |FALSE| otherwise.
--- If the {buf} argument is a number, buffer numbers are used.
--- Number zero is the alternate buffer for the current window.
---
--- If the {buf} argument is a string it must match a buffer name
--- exactly.  The name can be:
--- - Relative to the current directory.
--- - A full path.
--- - The name of a buffer with 'buftype' set to "nofile".
--- - A URL name.
--- Unlisted buffers will be found.
--- Note that help files are listed by their short name in the
--- output of |:buffers|, but bufexists() requires using their
--- long name to be able to find them.
--- bufexists() may report a buffer exists, but to use the name
--- with a |:buffer| command you may need to use |expand()|.  Esp
--- for MS-Windows 8.3 names in the form "c:\DOCUME~1"
--- Use "bufexists(0)" to test for the existence of an alternate
--- file name.
---
--- @param buf any
--- @return 0|1
function vim.fn.bufexists(buf) end

--- @deprecated
--- Obsolete name for |bufexists()|.
---
--- @param ... any
--- @return 0|1
function vim.fn.buffer_exists(...) end

--- @deprecated
--- Obsolete name for |bufname()|.
---
--- @param ... any
--- @return string
function vim.fn.buffer_name(...) end

--- @deprecated
--- Obsolete name for |bufnr()|.
---
--- @param ... any
--- @return integer
function vim.fn.buffer_number(...) end

--- Checks whether a buffer called {buf} exists and is listed
--- (has the 'buflisted' option set).  Returns |TRUE| if so,
--- |FALSE| otherwise.
--- The {buf} argument is used like with |bufexists()|.
---
--- @param buf any
--- @return 0|1
function vim.fn.buflisted(buf) end

--- Ensure the buffer {buf} is loaded.  When the buffer name
--- refers to an existing file then the file is read.  Otherwise
--- the buffer will be empty.  If the buffer was already loaded
--- then there is no change.  If the buffer is not related to a
--- file then no file is read (e.g., when 'buftype' is "nofile").
--- If there is an existing swap file for the file of the buffer,
--- there will be no dialog, the buffer will be loaded anyway.
--- The {buf} argument is used like with |bufexists()|.
---
--- @param buf any
function vim.fn.bufload(buf) end

--- Checks whether a buffer called {buf} exists and is loaded
--- (shown in a window or hidden).  Returns |TRUE| if so,
--- |FALSE| otherwise.
--- The {buf} argument is used like with |bufexists()|.
---
--- @param buf any
--- @return 0|1
function vim.fn.bufloaded(buf) end

--- The result is the name of a buffer.  Mostly as it is displayed
--- by the `:ls` command, but not using special names such as
--- "[No Name]".
--- If {buf} is omitted the current buffer is used.
--- If {buf} is a Number, that buffer number's name is given.
--- Number zero is the alternate buffer for the current window.
--- If {buf} is a String, it is used as a |file-pattern| to match
--- with the buffer names.  This is always done like 'magic' is
--- set and 'cpoptions' is empty.  When there is more than one
--- match an empty string is returned.
--- "" or "%" can be used for the current buffer, "#" for the
--- alternate buffer.
--- A full match is preferred, otherwise a match at the start, end
--- or middle of the buffer name is accepted.  If you only want a
--- full match then put "^" at the start and "$" at the end of the
--- pattern.
--- Listed buffers are found first.  If there is a single match
--- with a listed buffer, that one is returned.  Next unlisted
--- buffers are searched for.
--- If the {buf} is a String, but you want to use it as a buffer
--- number, force it to be a Number by adding zero to it: >vim
---   echo bufname("3" + 0)
--- <If the buffer doesn't exist, or doesn't have a name, an empty
--- string is returned. >vim
---   echo bufname("#")  " alternate buffer name
---   echo bufname(3)    " name of buffer 3
---   echo bufname("%")  " name of current buffer
---   echo bufname("file2")  " name of buffer where "file2" matches.
--- <
---
--- @param buf? integer|string
--- @return string
function vim.fn.bufname(buf) end

--- The result is the number of a buffer, as it is displayed by
--- the `:ls` command.  For the use of {buf}, see |bufname()|
--- above.
--- If the buffer doesn't exist, -1 is returned.  Or, if the
--- {create} argument is present and TRUE, a new, unlisted,
--- buffer is created and its number is returned.  Example: >vim
---   let newbuf = bufnr('Scratch001', 1)
--- <Using an empty name uses the current buffer.  To create a new
--- buffer with an empty name use |bufadd()|.
---
--- bufnr("$") is the last buffer: >vim
---   let last_buffer = bufnr("$")
--- <The result is a Number, which is the highest buffer number
--- of existing buffers.  Note that not all buffers with a smaller
--- number necessarily exist, because ":bwipeout" may have removed
--- them.  Use |bufexists()| to test for the existence of a buffer.
---
--- @param buf? integer|string
--- @param create? any
--- @return integer
function vim.fn.bufnr(buf, create) end

--- Returns the |window-ID| of the first window associated with
--- buffer {buf}.  For the use of {buf}, see |bufname()| above.
--- If buffer {buf} doesn't exist or there is no such window, -1
--- is returned.  Example: >vim
---
---   echo "A window containing buffer 1 is " .. (bufwinid(1))
--- <
--- Only deals with the current tab page.  See |win_findbuf()| for
--- finding more.
---
--- @param buf any
--- @return integer
function vim.fn.bufwinid(buf) end

--- Like |bufwinid()| but return the window number instead of the
--- |window-ID|.
--- If buffer {buf} doesn't exist or there is no such window, -1
--- is returned.  Example: >vim
---
---   echo "A window containing buffer 1 is " .. (bufwinnr(1))
---
--- <The number can be used with |CTRL-W_w| and ":wincmd w"
--- |:wincmd|.
---
--- @param buf any
--- @return integer
function vim.fn.bufwinnr(buf) end

--- Return the line number that contains the character at byte
--- count {byte} in the current buffer.  This includes the
--- end-of-line character, depending on the 'fileformat' option
--- for the current buffer.  The first character has byte count
--- one.
--- Also see |line2byte()|, |go| and |:goto|.
---
--- Returns -1 if the {byte} value is invalid.
---
--- @param byte any
--- @return integer
function vim.fn.byte2line(byte) end

--- Return byte index of the {nr}th character in the String
--- {expr}.  Use zero for the first character, it then returns
--- zero.
--- If there are no multibyte characters the returned value is
--- equal to {nr}.
--- Composing characters are not counted separately, their byte
--- length is added to the preceding base character.  See
--- |byteidxcomp()| below for counting composing characters
--- separately.
--- When {utf16} is present and TRUE, {nr} is used as the UTF-16
--- index in the String {expr} instead of as the character index.
--- The UTF-16 index is the index in the string when it is encoded
--- with 16-bit words.  If the specified UTF-16 index is in the
--- middle of a character (e.g. in a 4-byte character), then the
--- byte index of the first byte in the character is returned.
--- Refer to |string-offset-encoding| for more information.
--- Example : >vim
---   echo matchstr(str, ".", byteidx(str, 3))
--- <will display the fourth character.  Another way to do the
--- same: >vim
---   let s = strpart(str, byteidx(str, 3))
---   echo strpart(s, 0, byteidx(s, 1))
--- <Also see |strgetchar()| and |strcharpart()|.
---
--- If there are less than {nr} characters -1 is returned.
--- If there are exactly {nr} characters the length of the string
--- in bytes is returned.
--- See |charidx()| and |utf16idx()| for getting the character and
--- UTF-16 index respectively from the byte index.
--- Examples: >vim
---   echo byteidx('a😊😊', 2)  " returns 5
---   echo byteidx('a😊😊', 2, 1)  " returns 1
---   echo byteidx('a😊😊', 3, 1)  " returns 5
--- <
---
--- @param expr any
--- @param nr integer
--- @param utf16? any
--- @return integer
function vim.fn.byteidx(expr, nr, utf16) end

--- Like |byteidx()|, except that a composing character is counted
--- as a separate character.  Example: >vim
---   let s = 'e' .. nr2char(0x301)
---   echo byteidx(s, 1)
---   echo byteidxcomp(s, 1)
---   echo byteidxcomp(s, 2)
--- <The first and third echo result in 3 ('e' plus composing
--- character is 3 bytes), the second echo results in 1 ('e' is
--- one byte).
---
--- @param expr any
--- @param nr integer
--- @param utf16? any
--- @return integer
function vim.fn.byteidxcomp(expr, nr, utf16) end

--- Call function {func} with the items in |List| {arglist} as
--- arguments.
--- {func} can either be a |Funcref| or the name of a function.
--- a:firstline and a:lastline are set to the cursor line.
--- Returns the return value of the called function.
--- {dict} is for functions with the "dict" attribute.  It will be
--- used to set the local variable "self". |Dictionary-function|
---
--- @param func any
--- @param arglist any
--- @param dict? any
--- @return any
function vim.fn.call(func, arglist, dict) end

--- Return the smallest integral value greater than or equal to
--- {expr} as a |Float| (round up).
--- {expr} must evaluate to a |Float| or a |Number|.
--- Examples: >vim
---   echo ceil(1.456)
--- <  2.0  >vim
---   echo ceil(-5.456)
--- <  -5.0  >vim
---   echo ceil(4.0)
--- <  4.0
---
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
---
--- @param expr number
--- @return number
function vim.fn.ceil(expr) end

--- Close a channel or a specific stream associated with it.
--- For a job, {stream} can be one of "stdin", "stdout",
--- "stderr" or "rpc" (closes stdin/stdout for a job started
--- with `"rpc":v:true`) If {stream} is omitted, all streams
--- are closed. If the channel is a pty, this will then close the
--- pty master, sending SIGHUP to the job process.
--- For a socket, there is only one stream, and {stream} should be
--- omitted.
---
--- @param id integer
--- @param stream? string
--- @return 0|1
function vim.fn.chanclose(id, stream) end

--- Return the number of the most recent change.  This is the same
--- number as what is displayed with |:undolist| and can be used
--- with the |:undo| command.
--- When a change was made it is the number of that change.  After
--- redo it is the number of the redone change.  After undo it is
--- one less than the number of the undone change.
--- Returns 0 if the undo list is empty.
---
--- @return integer
function vim.fn.changenr() end

--- Send data to channel {id}. For a job, it writes it to the
--- stdin of the process. For the stdio channel |channel-stdio|,
--- it writes to Nvim's stdout.  Returns the number of bytes
--- written if the write succeeded, 0 otherwise.
--- See |channel-bytes| for more information.
---
--- {data} may be a string, string convertible, |Blob|, or a list.
--- If {data} is a list, the items will be joined by newlines; any
--- newlines in an item will be sent as NUL. To send a final
--- newline, include a final empty string. Example: >vim
---   call chansend(id, ["abc", "123\n456", ""])
--- <will send "abc<NL>123<NUL>456<NL>".
---
--- chansend() writes raw data, not RPC messages.  If the channel
--- was created with `"rpc":v:true` then the channel expects RPC
--- messages, use |rpcnotify()| and |rpcrequest()| instead.
---
--- @param id number
--- @param data string|string[]
--- @return 0|1
function vim.fn.chansend(id, data) end

--- Return Number value of the first char in {string}.
--- Examples: >vim
---   echo char2nr(" ")  " returns 32
---   echo char2nr("ABC")  " returns 65
---   echo char2nr("á")  " returns 225
---   echo char2nr("á"[0])  " returns 195
---   echo char2nr("\<M-x>")  " returns 128
--- <Non-ASCII characters are always treated as UTF-8 characters.
--- {utf8} is ignored, it exists only for backwards-compatibility.
--- A combining character is a separate character.
--- |nr2char()| does the opposite.
---
--- Returns 0 if {string} is not a |String|.
---
--- @param string string
--- @param utf8? any
--- @return 0|1
function vim.fn.char2nr(string, utf8) end

--- Return the character class of the first character in {string}.
--- The character class is one of:
---   0  blank
---   1  punctuation
---   2  word character (depends on 'iskeyword')
---   3  emoji
---   other  specific Unicode class
--- The class is used in patterns and word motions.
--- Returns 0 if {string} is not a |String|.
---
--- @param string string
--- @return 0|1|2|3|'other'
function vim.fn.charclass(string) end

--- Same as |col()| but returns the character index of the column
--- position given with {expr} instead of the byte position.
---
--- Example:
--- With the cursor on '세' in line 5 with text "여보세요": >vim
---   echo charcol('.')  " returns 3
---   echo col('.')    " returns 7
--- <
---
--- @param expr string|any[]
--- @param winid? integer
--- @return integer
function vim.fn.charcol(expr, winid) end

--- Return the character index of the byte at {idx} in {string}.
--- The index of the first character is zero.
--- If there are no multibyte characters the returned value is
--- equal to {idx}.
---
--- When {countcc} is omitted or |FALSE|, then composing characters
--- are not counted separately, their byte length is added to the
--- preceding base character.
--- When {countcc} is |TRUE|, then composing characters are
--- counted as separate characters.
---
--- When {utf16} is present and TRUE, {idx} is used as the UTF-16
--- index in the String {expr} instead of as the byte index.
---
--- Returns -1 if the arguments are invalid or if there are less
--- than {idx} bytes.  If there are exactly {idx} bytes the length
--- of the string in characters is returned.
---
--- An error is given and -1 is returned if the first argument is
--- not a string, the second argument is not a number or when the
--- third argument is present and is not zero or one.
---
--- See |byteidx()| and |byteidxcomp()| for getting the byte index
--- from the character index and |utf16idx()| for getting the
--- UTF-16 index from the character index.
--- Refer to |string-offset-encoding| for more information.
--- Examples: >vim
---   echo charidx('áb́ć', 3)    " returns 1
---   echo charidx('áb́ć', 6, 1)  " returns 4
---   echo charidx('áb́ć', 16)    " returns -1
---   echo charidx('a😊😊', 4, 0, 1)  " returns 2
--- <
---
--- @param string string
--- @param idx integer
--- @param countcc? boolean
--- @param utf16? boolean
--- @return integer
function vim.fn.charidx(string, idx, countcc, utf16) end

--- Changes the current working directory to {dir}.  The scope of
--- the change is determined as follows:
--- If {scope} is not present, the current working directory is
--- changed to the scope of the current directory:
---     - If the window local directory (|:lcd|) is set, it
---       changes the current working directory for that scope.
---     - Otherwise, if the tab page local directory (|:tcd|) is
---       set, it changes the current directory for that scope.
---     - Otherwise, changes the global directory for that scope.
---
--- If {scope} is present, changes the current working directory
--- for the specified scope:
---     "window"  Changes the window local directory.  |:lcd|
---     "tabpage"  Changes the tab page local directory.  |:tcd|
---     "global"  Changes the global directory.  |:cd|
---
--- {dir} must be a String.
--- If successful, returns the previous working directory.  Pass
--- this to another chdir() to restore the directory.
--- On failure, returns an empty string.
---
--- Example: >vim
---   let save_dir = chdir(newdir)
---   if save_dir != ""
---      " ... do some work
---      call chdir(save_dir)
---   endif
--- <
---
--- @param dir string
--- @param scope? string
--- @return string
function vim.fn.chdir(dir, scope) end

--- Get the amount of indent for line {lnum} according the
--- |C-indenting| rules, as with 'cindent'.
--- The indent is counted in spaces, the value of 'tabstop' is
--- relevant.  {lnum} is used just like in |getline()|.
--- When {lnum} is invalid -1 is returned.
---
--- To get or set indent of lines in a string, see |vim.text.indent()|.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.cindent(lnum) end

--- Clears all matches previously defined for the current window
--- by |matchadd()| and the |:match| commands.
--- If {win} is specified, use the window with this number or
--- window ID instead of the current window.
---
--- @param win? integer
function vim.fn.clearmatches(win) end

--- Returns a |Dictionary| with information about cmdline
--- completion.  See |cmdline-completion|.
--- The items are:
---    cmdline_orig  The original command-line string before
---     completion began.
---    pum_visible  |TRUE| if popup menu is visible.
---     See |pumvisible()|.
---    matches  List of all completion candidates.  Each item
---     is a string.
---    selected  Selected item index.  First index is zero.
---     Index is -1 if no item is selected (showing
---     typed text only, or the last completion after
---     no item is selected when using the <Up> or
---     <Down> keys)
---
--- Returns an empty |Dictionary| if no completion was attempted,
--- if there was only one candidate and it was fully completed, or
--- if an error occurred.
---
--- @return table<string,any>
function vim.fn.cmdcomplete_info() end

--- Returns the byte index of the column position given with
--- {expr}.
--- For accepted positions see |getpos()|.
--- When {expr} is "$", it means the end of the cursor line, so
--- the result is the number of bytes in the cursor line plus one.
--- Additionally {expr} can be [lnum, col]: a |List| with the line
--- and column number.  Most useful when the column is "$", to get
--- the last column of a specific line.  When "lnum" or "col" is
--- out of range then col() returns zero.
---
--- With the optional {winid} argument the values are obtained for
--- that window instead of the current window.
---
--- To get the line number use |line()|.  To get both use
--- |getpos()|.
---
--- For the screen column position use |virtcol()|.  For the
--- character position use |charcol()|.
---
--- Note that only marks in the current file can be used.
---
--- Examples: >vim
---   echo col(".")      " column of cursor
---   echo col("$")      " length of cursor line plus one
---   echo col("'t")      " column of mark t
---   echo col("'" .. markname)  " column of mark markname
--- <
--- The first column is 1.  Returns 0 if {expr} is invalid or when
--- the window with ID {winid} is not found.
--- For an uppercase mark the column may actually be in another
--- buffer.
--- For the cursor position, when 'virtualedit' is active, the
--- column is one higher if the cursor is after the end of the
--- line.  Also, when using a <Cmd> mapping the cursor isn't
--- moved, this can be used to obtain the column in Insert mode: >vim
---   imap <F2> <Cmd>echo col(".").."\n"<CR>
--- <
---
--- @param expr string|any[]
--- @param winid? integer
--- @return integer
function vim.fn.col(expr, winid) end

--- Set the matches for Insert mode completion.  Can only be used
--- in Insert mode.  Typically invoked from a mapping with
--- CTRL-R = (see |i_CTRL-R|), but may also be called from a
--- |<Cmd>| mapping.  It does not work after CTRL-O or with an
--- expression mapping.
--- {startcol} is the byte offset in the line where the completed
--- text start.  The text up to the cursor is the original text
--- that will be replaced by the matches.  Use col('.') for an
--- empty string.  "col('.') - 1" will replace one character by a
--- match.
--- {matches} must be a |List|.  Each |List| item is one match.
--- See |complete-items| for the kind of items that are possible.
--- "longest" in 'completeopt' is ignored.
--- Note that the after calling this function you need to avoid
--- inserting anything that would cause completion to stop.
--- The match can be selected with CTRL-N and CTRL-P as usual with
--- Insert mode completion.  The popup menu will appear if
--- specified, see |ins-completion-menu|.
--- Example: >vim
---
--- inoremap <F5> <C-R>=ListMonths()<CR>
---
--- func ListMonths()
---   call complete(col('.'), ['January', 'February', 'March',
---   \ 'April', 'May', 'June', 'July', 'August',
---   \ 'September', 'October', 'November', 'December'])
---   return ''
--- endfunc
---
--- <This isn't very useful, but it shows how it works.  Note that
--- an empty string is returned to avoid a zero being inserted.
---
--- @param startcol integer
--- @param matches any[]
function vim.fn.complete(startcol, matches) end

--- Add {expr} to the list of matches.  Only to be used by the
--- function specified with the 'completefunc' option.
--- Returns 0 for failure (empty string or out of memory),
--- 1 when the match was added, 2 when the match was already in
--- the list.
--- See |complete-functions| for an explanation of {expr}.  It is
--- the same as one item in the list that 'omnifunc' would return.
---
--- @param expr any
--- @return 0|1|2
function vim.fn.complete_add(expr) end

--- Check for a key typed while looking for completion matches.
--- This is to be used when looking for matches takes some time.
--- Returns |TRUE| when searching for matches is to be aborted,
--- zero otherwise.
--- Only to be used by the function specified with the
--- 'completefunc' option.
---
--- @return 0|1
function vim.fn.complete_check() end

--- Returns a |Dictionary| with information about Insert mode
--- completion.  See |ins-completion|.
--- The items are:
---    completed  Return a dictionary containing the entries of
---     the currently selected index item.
---    items  List of all completion candidates.  Each item
---     is a dictionary containing the entries "word",
---     "abbr", "menu", "kind", "info" and
---     "user_data".
---     See |complete-items|.
---    matches  Same as "items", but only returns items that
---     are matching current query.  If both "matches"
---     and "items" are in "what", the returned list
---     will still be named "items", but each item
---     will have an additional "match" field.
---    mode    Current completion mode name string.
---     See |complete_info_mode| for the values.
---    preinserted_text
---     The actual text that is pre-inserted, see
---     |preinserted()|.
---    pum_visible  |TRUE| if popup menu is visible.
---     See |pumvisible()|.
---    selected  Selected item index.  First index is zero.
---     Index is -1 if no item is selected (showing
---     typed text only, or the last completion after
---     no item is selected when using the <Up> or
---     <Down> keys)
---    preview_winid     Info floating preview window id.
---    preview_bufnr     Info floating preview buffer id.
---
---           *complete_info_mode*
--- mode values are:
---    ""         Not in completion mode
---    "keyword"       Keyword completion |i_CTRL-X_CTRL-N|
---    "ctrl_x"       Just pressed CTRL-X |i_CTRL-X|
---    "scroll"       Scrolling with |i_CTRL-X_CTRL-E| or
---          |i_CTRL-X_CTRL-Y|
---    "whole_line"       Whole lines |i_CTRL-X_CTRL-L|
---    "files"       File names |i_CTRL-X_CTRL-F|
---    "tags"       Tags |i_CTRL-X_CTRL-]|
---    "path_defines"    Definition completion |i_CTRL-X_CTRL-D|
---    "path_patterns"   Include completion |i_CTRL-X_CTRL-I|
---    "dictionary"       Dictionary |i_CTRL-X_CTRL-K|
---    "thesaurus"       Thesaurus |i_CTRL-X_CTRL-T|
---    "cmdline"       Vim Command line |i_CTRL-X_CTRL-V|
---    "function"       User defined completion |i_CTRL-X_CTRL-U|
---    "omni"       Omni completion |i_CTRL-X_CTRL-O|
---    "spell"       Spelling suggestions |i_CTRL-X_s|
---    "eval"       |complete()| completion
---    "register"       Words from registers |i_CTRL-X_CTRL-R|
---    "unknown"       Other internal modes
---
--- If the optional {what} list argument is supplied, then only
--- the items listed in {what} are returned.  Unsupported items in
--- {what} are silently ignored.
---
--- To get the position and size of the popup menu, see
--- |pum_getpos()|.  It's also available in |v:event| during the
--- |CompleteChanged| event.
---
--- Returns an empty |Dictionary| on error.
---
--- Examples: >vim
---   " Get all items
---   call complete_info()
---   " Get only 'mode'
---   call complete_info(['mode'])
---   " Get only 'mode' and 'pum_visible'
---   call complete_info(['mode', 'pum_visible'])
--- <
---
--- @param what? any[]
--- @return table
function vim.fn.complete_info(what) end

--- confirm() offers the user a dialog, from which a choice can be
--- made.  It returns the number of the choice.  For the first
--- choice this is 1.
---
--- {msg} is displayed in a dialog with {choices} as the
--- alternatives.  When {choices} is missing or empty, "&OK" is
--- used (and translated).
--- {msg} is a String, use '\n' to include a newline.  Only on
--- some systems the string is wrapped when it doesn't fit.
---
--- {choices} is a String, with the individual choices separated
--- by '\n', e.g. >vim
---   confirm("Save changes?", "&Yes\n&No\n&Cancel")
--- <The letter after the '&' is the shortcut key for that choice.
--- Thus you can type 'c' to select "Cancel".  The shortcut does
--- not need to be the first letter: >vim
---   confirm("file has been modified", "&Save\nSave &All")
--- <For the console, the first letter of each choice is used as
--- the default shortcut key.  Case is ignored.
---
--- The optional {type} String argument gives the type of dialog.
--- It can be one of these values: "Error", "Question", "Info",
--- "Warning" or "Generic".  Only the first character is relevant.
--- When {type} is omitted, "Generic" is used.
---
--- The optional {type} argument gives the type of dialog.  This
--- is only used for the icon of the Win32 GUI.  It can be one of
--- these values: "Error", "Question", "Info", "Warning" or
--- "Generic".  Only the first character is relevant.
--- When {type} is omitted, "Generic" is used.
---
--- If the user aborts the dialog by pressing <Esc>, CTRL-C,
--- or another valid interrupt key, confirm() returns 0.
---
--- An example: >vim
---    let choice = confirm("What do you want?",
---       \ "&Apples\n&Oranges\n&Bananas", 2)
---    if choice == 0
---   echo "make up your mind!"
---    elseif choice == 3
---   echo "tasteful"
---    else
---   echo "I prefer bananas myself."
---    endif
--- <In a GUI dialog, buttons are used.  The layout of the buttons
--- depends on the 'v' flag in 'guioptions'.  If it is included,
--- the buttons are always put vertically.  Otherwise,  confirm()
--- tries to put the buttons in one horizontal line.  If they
--- don't fit, a vertical layout is used anyway.  For some systems
--- the horizontal layout is always used.
---
--- @param msg string
--- @param choices? string
--- @param default? integer
--- @param type? string
--- @return integer
function vim.fn.confirm(msg, choices, default, type) end

--- Make a copy of {expr}.  For Numbers and Strings this isn't
--- different from using {expr} directly.
--- When {expr} is a |List| a shallow copy is created.  This means
--- that the original |List| can be changed without changing the
--- copy, and vice versa.  But the items are identical, thus
--- changing an item changes the contents of both |Lists|.
--- A |Dictionary| is copied in a similar way as a |List|.
--- Also see |deepcopy()|.
---
--- @generic T
--- @param expr T
--- @return T
function vim.fn.copy(expr) end

--- Return the cosine of {expr}, measured in radians, as a |Float|.
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo cos(100)
--- <  0.862319 >vim
---   echo cos(-4.01)
--- <  -0.646043
---
--- @param expr number
--- @return number
function vim.fn.cos(expr) end

--- Return the hyperbolic cosine of {expr} as a |Float| in the range
--- [1, inf].
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo cosh(0.5)
--- <  1.127626 >vim
---   echo cosh(-0.5)
--- <  -1.127626
---
--- @param expr number
--- @return number
function vim.fn.cosh(expr) end

--- Return the number of times an item with value {expr} appears
--- in |String|, |List| or |Dictionary| {comp}.
---
--- If {start} is given then start with the item with this index.
--- {start} can only be used with a |List|.
---
--- When {ic} is given and it's |TRUE| then case is ignored.
---
--- When {comp} is a string then the number of not overlapping
--- occurrences of {expr} is returned.  Zero is returned when
--- {expr} is an empty string.
---
--- @param comp string|table|any[]
--- @param expr any
--- @param ic? boolean
--- @param start? integer
--- @return integer
function vim.fn.count(comp, expr, ic, start) end

--- Returns a |Dictionary| representing the |context| at {index}
--- from the top of the |context-stack| (see |context-dict|).
--- If {index} is not given, it is assumed to be 0 (i.e.: top).
---
--- @param index? integer
--- @return table
function vim.fn.ctxget(index) end

--- Pops and restores the |context| at the top of the
--- |context-stack|.
---
--- @return any
function vim.fn.ctxpop() end

--- Pushes the current editor state (|context|) on the
--- |context-stack|.
--- If {types} is given and is a |List| of |String|s, it specifies
--- which |context-types| to include in the pushed context.
--- Otherwise, all context types are included.
---
--- @param types? string[]
--- @return any
function vim.fn.ctxpush(types) end

--- Sets the |context| at {index} from the top of the
--- |context-stack| to that represented by {context}.
--- {context} is a Dictionary with context data (|context-dict|).
--- If {index} is not given, it is assumed to be 0 (i.e.: top).
---
--- @param context table
--- @param index? integer
--- @return integer
function vim.fn.ctxset(context, index) end

--- Returns the size of the |context-stack|.
---
--- @return any
function vim.fn.ctxsize() end

--- @param lnum integer|string
--- @param col? integer
--- @param off? integer
--- @return any
function vim.fn.cursor(lnum, col, off) end

--- Positions the cursor at the column (byte count) {col} in the
--- line {lnum}.  The first column is one.
---
--- When there is one argument {list} this is used as a |List|
--- with two, three or four item:
---   [{lnum}, {col}]
---   [{lnum}, {col}, {off}]
---   [{lnum}, {col}, {off}, {curswant}]
--- This is like the return value of |getpos()| or |getcurpos()|,
--- but without the first item.
---
--- To position the cursor using {col} as the character count, use
--- |setcursorcharpos()|.
---
--- Does not change the jumplist.
--- {lnum} is used like with |getline()|, except that if {lnum} is
--- zero, the cursor will stay in the current line.
--- If {lnum} is greater than the number of lines in the buffer,
--- the cursor will be positioned at the last line in the buffer.
--- If {col} is greater than the number of bytes in the line,
--- the cursor will be positioned at the last character in the
--- line.
--- If {col} is zero, the cursor will stay in the current column.
--- If {curswant} is given it is used to set the preferred column
--- for vertical movement.  Otherwise {col} is used.
---
--- When 'virtualedit' is used {off} specifies the offset in
--- screen columns from the start of the character.  E.g., a
--- position within a <Tab> or after the last character.
--- Returns 0 when the position could be set, -1 otherwise.
---
--- @param list integer[]
--- @return any
function vim.fn.cursor(list) end

--- Specifically used to interrupt a program being debugged.  It
--- will cause process {pid} to get a SIGTRAP.  Behavior for other
--- processes is undefined.  See |terminal-debug|.
--- (Sends a SIGINT to a process {pid} other than MS-Windows)
---
--- Returns |TRUE| if successfully interrupted the program.
--- Otherwise returns |FALSE|.
---
--- @param pid integer
--- @return any
function vim.fn.debugbreak(pid) end

--- Make a copy of {expr}.  For Numbers and Strings this isn't
--- different from using {expr} directly.
--- When {expr} is a |List| a full copy is created.  This means
--- that the original |List| can be changed without changing the
--- copy, and vice versa.  When an item is a |List|, a copy for it
--- is made, recursively.  Thus changing an item in the copy does
--- not change the contents of the original |List|.
---
--- When {noref} is omitted or zero a contained |List| or
--- |Dictionary| is only copied once.  All references point to
--- this single copy.  With {noref} set to 1 every occurrence of a
--- |List| or |Dictionary| results in a new copy.  This also means
--- that a cyclic reference causes deepcopy() to fail.
---           *E724*
--- Nesting is possible up to 100 levels.  When there is an item
--- that refers back to a higher level making a deep copy with
--- {noref} set to 1 will fail.
--- Also see |copy()|.
---
--- @generic T
--- @param expr T
--- @param noref? boolean
--- @return T
function vim.fn.deepcopy(expr, noref) end

--- Lua: see |vim.fs.rm()|.
---
--- Without {flags} or with {flags} empty: Deletes the file by the
--- name {fname}.
---
--- This also works when {fname} is a symbolic link.  The symbolic
--- link itself is deleted, not what it points to.
---
--- When {flags} is "d": Deletes the directory by the name
--- {fname}.  This fails when directory {fname} is not empty.
---
--- When {flags} is "rf": Deletes the directory by the name
--- {fname} and everything in it, recursively.  BE CAREFUL!
--- Note: on MS-Windows it is not possible to delete a directory
--- that is being used.
---
--- The result is a Number, which is 0/false if the delete
--- operation was successful and -1/true when the deletion failed
--- or partly failed.
---
--- @param fname string
--- @param flags? string
--- @return integer
function vim.fn.delete(fname, flags) end

--- Delete lines {first} to {last} (inclusive) from buffer {buf}.
--- If {last} is omitted then delete line {first} only.
--- On success 0 is returned, on failure 1 is returned.
---
--- This function works only for loaded buffers.  First call
--- |bufload()| if needed.
---
--- For the use of {buf}, see |bufname()| above.
---
--- {first} and {last} are used like with |getline()|.  Note that
--- when using |line()| this refers to the current buffer.  Use "$"
--- to refer to the last line in buffer {buf}.
---
--- @param buf integer|string
--- @param first integer|string
--- @param last? integer|string
--- @return any
function vim.fn.deletebufline(buf, first, last) end

--- Adds a watcher to a dictionary. A dictionary watcher is
--- identified by three components:
---
--- - A dictionary({dict});
--- - A key pattern({pattern}).
--- - A function({callback}).
---
--- After this is called, every change on {dict} and on keys
--- matching {pattern} will result in {callback} being invoked.
---
--- For example, to watch all global variables: >vim
---   silent! call dictwatcherdel(g:, '*', 'OnDictChanged')
---   function! OnDictChanged(d,k,z)
---     echomsg string(a:k) string(a:z)
---   endfunction
---   call dictwatcheradd(g:, '*', 'OnDictChanged')
--- <
--- For now {pattern} only accepts very simple patterns that can
--- contain a "*" at the end of the string, in which case it will
--- match every key that begins with the substring before the "*".
--- That means if "*" is not the last character of {pattern}, only
--- keys that are exactly equal as {pattern} will be matched.
---
--- The {callback} receives three arguments:
---
--- - The dictionary being watched.
--- - The key which changed.
--- - A dictionary containing the new and old values for the key.
---
--- The type of change can be determined by examining the keys
--- present on the third argument:
---
--- - If contains both `old` and `new`, the key was updated.
--- - If it contains only `new`, the key was added.
--- - If it contains only `old`, the key was deleted.
---
--- This function can be used by plugins to implement options with
--- validation and parsing logic.
---
--- @param dict table
--- @param pattern string
--- @param callback function
--- @return any
function vim.fn.dictwatcheradd(dict, pattern, callback) end

--- Removes a watcher added  with |dictwatcheradd()|. All three
--- arguments must match the ones passed to |dictwatcheradd()| in
--- order for the watcher to be successfully deleted.
---
--- @param dict any
--- @param pattern string
--- @param callback function
--- @return any
function vim.fn.dictwatcherdel(dict, pattern, callback) end

--- Returns |TRUE| when autocommands are being executed and the
--- FileType event has been triggered at least once.  Can be used
--- to avoid triggering the FileType event again in the scripts
--- that detect the file type. |FileType|
--- Returns |FALSE| when `:setf FALLBACK` was used.
--- When editing another file, the counter is reset, thus this
--- really checks if the FileType event has been triggered for the
--- current buffer.  This allows an autocommand that starts
--- editing another buffer to set 'filetype' and load a syntax
--- file.
---
--- @return integer
function vim.fn.did_filetype() end

--- Returns the number of filler lines above line {lnum}.
--- These are the lines that were inserted at this point in
--- another diff'ed window.  These filler lines are shown in the
--- display but don't exist in the buffer.
--- {lnum} is used like with |getline()|.  Thus "." is the current
--- line, "'m" mark m, etc.
--- Returns 0 if the current window is not in diff mode.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.diff_filler(lnum) end

--- Returns the highlight ID for diff mode at line {lnum} column
--- {col} (byte index).  When the current line does not have a
--- diff change zero is returned.
--- {lnum} is used like with |getline()|.  Thus "." is the current
--- line, "'m" mark m, etc.
--- {col} is 1 for the leftmost column, {lnum} is 1 for the first
--- line.
--- The highlight ID can be used with |synIDattr()| to obtain
--- syntax information about the highlighting.
---
--- @param lnum integer|string
--- @param col integer
--- @return any
function vim.fn.diff_hlID(lnum, col) end

--- Return the digraph of {chars}.  This should be a string with
--- exactly two characters.  If {chars} are not just two
--- characters, or the digraph of {chars} does not exist, an error
--- is given and an empty string is returned.
---
--- Also see |digraph_getlist()|.
---
--- Examples: >vim
--- " Get a built-in digraph
--- echo digraph_get('00')    " Returns '∞'
---
--- " Get a user-defined digraph
--- call digraph_set('aa', 'あ')
--- echo digraph_get('aa')    " Returns 'あ'
--- <
---
--- @param chars string
--- @return string
function vim.fn.digraph_get(chars) end

--- Return a list of digraphs.  If the {listall} argument is given
--- and it is TRUE, return all digraphs, including the default
--- digraphs.  Otherwise, return only user-defined digraphs.
---
--- Also see |digraph_get()|.
---
--- Examples: >vim
--- " Get user-defined digraphs
--- echo digraph_getlist()
---
--- " Get all the digraphs, including default digraphs
--- echo digraph_getlist(1)
--- <
---
--- @param listall? boolean
--- @return string[][]
function vim.fn.digraph_getlist(listall) end

--- Add digraph {chars} to the list.  {chars} must be a string
--- with two characters.  {digraph} is a string with one UTF-8
--- encoded character.  *E1215*
--- Be careful, composing characters are NOT ignored.  This
--- function is similar to |:digraphs| command, but useful to add
--- digraphs start with a white space.
---
--- The function result is v:true if |digraph| is registered.  If
--- this fails an error message is given and v:false is returned.
---
--- If you want to define multiple digraphs at once, you can use
--- |digraph_setlist()|.
---
--- Example: >vim
---   call digraph_set('  ', 'あ')
--- <
---
--- @param chars string
--- @param digraph string
--- @return any
function vim.fn.digraph_set(chars, digraph) end

--- Similar to |digraph_set()| but this function can add multiple
--- digraphs at once.  {digraphlist} is a list composed of lists,
--- where each list contains two strings with {chars} and
--- {digraph} as in |digraph_set()|. *E1216*
--- Example: >vim
---     call digraph_setlist([['aa', 'あ'], ['ii', 'い']])
--- <
--- It is similar to the following: >vim
---     for [chars, digraph] in [['aa', 'あ'], ['ii', 'い']]
---     call digraph_set(chars, digraph)
---     endfor
--- <Except that the function returns after the first error,
--- following digraphs will not be added.
---
--- @param digraphlist table<integer,string[]>
--- @return any
function vim.fn.digraph_setlist(digraphlist) end

--- Return the Number 1 if {expr} is empty, zero otherwise.
--- - A |List| or |Dictionary| is empty when it does not have any
---   items.
--- - A |String| is empty when its length is zero.
--- - A |Number| and |Float| are empty when their value is zero.
--- - |v:false| and |v:null| are empty, |v:true| is not.
--- - A |Blob| is empty when its length is zero.
---
--- @param expr any
--- @return integer
function vim.fn.empty(expr) end

--- Return all of environment variables as dictionary.  You can
--- check if an environment variable exists like this: >vim
---   echo has_key(environ(), 'HOME')
--- <Note that the variable name may be CamelCase; to ignore case
--- use this: >vim
---   echo index(keys(environ()), 'HOME', 0, 1) != -1
--- <
---
--- @return any
function vim.fn.environ() end

--- Escape the characters in {chars} that occur in {string} with a
--- backslash.  Example: >vim
---   echo escape('c:\program files\vim', ' \')
--- <results in: >
---   c:\\program\ files\\vim
--- <Also see |shellescape()| and |fnameescape()|.
---
--- @param string string
--- @param chars string
--- @return string
function vim.fn.escape(string, chars) end

--- Evaluate {string} and return the result.  Especially useful to
--- turn the result of |string()| back into the original value.
--- This works for Numbers, Floats, Strings, Blobs and composites
--- of them.  Also works for |Funcref|s that refer to existing
--- functions.
---
--- @param string string
--- @return any
function vim.fn.eval(string) end

--- Returns 1 when inside an event handler.  That is that Vim got
--- interrupted while waiting for the user to type a character,
--- e.g., when dropping a file on Vim.  This means interactive
--- commands cannot be used.  Otherwise zero is returned.
---
--- @return any
function vim.fn.eventhandler() end

--- This function checks if an executable with the name {expr}
--- exists.  {expr} must be the name of the program without any
--- arguments.
---
--- executable() uses the value of $PATH and/or the normal
--- searchpath for programs.
---           *PATHEXT*
--- On MS-Windows the ".exe", ".bat", etc. can optionally be
--- included.  Then the extensions in $PATHEXT are tried.  Thus if
--- "foo.exe" does not exist, "foo.exe.bat" can be found.  If
--- $PATHEXT is not set then ".com;.exe;.bat;.cmd" is used.  A dot
--- by itself can be used in $PATHEXT to try using the name
--- without an extension.  When 'shell' looks like a Unix shell,
--- then the name is also tried without adding an extension.
--- On MS-Windows it only checks if the file exists and is not a
--- directory, not if it's really executable.
---
--- On MS-Windows an executable in the same directory as the Vim
--- executable is always found (it's added to $PATH at |startup|).
---       *$NoDefaultCurrentDirectoryInExePath*
--- On MS-Windows when using cmd.exe as 'shell' an executable in
--- Vim's current working directory is also normally found, which
--- can be disabled by setting the
--- `$NoDefaultCurrentDirectoryInExePath` environment variable.
--- This variable is always set by Vim when executing external
--- commands (e.g., via |:!|, |:make|, or |system()|) for security
--- reasons.
---
--- The result is a Number:
---   1  exists
---   0  does not exist
--- |exepath()| can be used to get the full path of an executable.
---
--- @param expr string
--- @return 0|1
function vim.fn.executable(expr) end

--- Execute {command} and capture its output.
--- If {command} is a |String|, returns {command} output.
--- If {command} is a |List|, returns concatenated outputs.
--- Line continuations in {command} are not recognized.
--- Examples: >vim
---   echo execute('echon "foo"')
--- <  foo >vim
---   echo execute(['echon "foo"', 'echon "bar"'])
--- <  foobar
---
--- The optional {silent} argument can have these values:
---   ""    no `:silent` used
---   "silent"  `:silent` used
---   "silent!"  `:silent!` used
--- The default is "silent".  Note that with "silent!", unlike
--- `:redir`, error messages are dropped.
---
--- To get a list of lines use `split()` on the result: >vim
---   execute('args')->split("\n")
---
--- <This function is not available in the |sandbox|.
--- Note: If nested, an outer execute() will not observe output of
--- the inner calls.
--- Note: Text attributes (highlights) are not captured.
--- To execute a command in another window than the current one
--- use `win_execute()`.
---
--- @param command string|string[]
--- @param silent? ''|'silent'|'silent!'
--- @return string
function vim.fn.execute(command, silent) end

--- Returns the full path of {expr} if it is an executable and
--- given as a (partial or full) path or is found in $PATH.
--- Returns empty string otherwise.
--- If {expr} starts with "./" the |current-directory| is used.
---
--- @param expr string
--- @return string
function vim.fn.exepath(expr) end

--- Checks whether the expression {expr} is defined.
--- Returns |TRUE| if {expr} is defined, zero otherwise.
---
--- For checking for a supported feature use |has()|.
--- For checking if a file exists use |filereadable()|.
---
--- The {expr} argument is a string, which contains one of these:
---   varname    internal variable (see
---   dict.key  |internal-variables|).  Also works
---   list[i]    for |curly-braces-names|, |Dictionary|
---       entries, |List| items, etc.
---       Beware that evaluating an index may
---       cause an error message for an invalid
---       expression.  E.g.: >vim
---          let l = [1, 2, 3]
---          echo exists("l[5]")
--- <         0 >vim
---          echo exists("l[xx]")
--- <         E121: Undefined variable: xx
---          0
---   &option-name  Vim option (only checks if it exists,
---       not if it really works)
---   +option-name  Vim option that works.
---   $ENVNAME  environment variable (could also be
---       done by comparing with an empty
---       string)
---   `*funcname`  built-in function (see |functions|)
---       or user defined function (see
---       |user-function|). Also works for a
---       variable that is a Funcref.
---   :cmdname  Ex command: built-in command, user
---       command or command modifier |:command|.
---       Returns:
---       1  for match with start of a command
---       2  full match with a command
---       3  matches several user commands
---       To check for a supported command
---       always check the return value to be 2.
---   :2match    The |:2match| command.
---   :3match    The |:3match| command (but you
---       probably should not use it, it is
---       reserved for internal usage)
---   #event    autocommand defined for this event
---   #event#pattern  autocommand defined for this event and
---       pattern (the pattern is taken
---       literally and compared to the
---       autocommand patterns character by
---       character)
---   #group    autocommand group exists
---   #group#event  autocommand defined for this group and
---       event.
---   #group#event#pattern
---       autocommand defined for this group,
---       event and pattern.
---   ##event    autocommand for this event is
---       supported.
---
--- Examples: >vim
---   echo exists("&mouse")
---   echo exists("$HOSTNAME")
---   echo exists("*strftime")
---   echo exists("*s:MyFunc")
---   echo exists("*MyFunc")
---   echo exists("*v:lua.Func")
---   echo exists("bufcount")
---   echo exists(":Make")
---   echo exists("#CursorHold")
---   echo exists("#BufReadPre#*.gz")
---   echo exists("#filetypeindent")
---   echo exists("#filetypeindent#FileType")
---   echo exists("#filetypeindent#FileType#*")
---   echo exists("##ColorScheme")
--- <There must be no space between the symbol (&/$/*/#) and the
--- name.
--- There must be no extra characters after the name, although in
--- a few cases this is ignored.  That may become stricter in the
--- future, thus don't count on it!
--- Working example: >vim
---   echo exists(":make")
--- <NOT working example: >vim
---   echo exists(":make install")
---
--- <Note that the argument must be a string, not the name of the
--- variable itself.  For example: >vim
---   echo exists(bufcount)
--- <This doesn't check for existence of the "bufcount" variable,
--- but gets the value of "bufcount", and checks if that exists.
---
--- @param expr string
--- @return 0|1
function vim.fn.exists(expr) end

--- Return the exponential of {expr} as a |Float| in the range
--- [0, inf].
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo exp(2)
--- <  7.389056 >vim
---   echo exp(-1)
--- <  0.367879
---
--- @param expr number
--- @return any
function vim.fn.exp(expr) end

--- Expand wildcards and the following special keywords in
--- {string}.  'wildignorecase' applies.
---
--- If {list} is given and it is |TRUE|, a List will be returned.
--- Otherwise the result is a String and when there are several
--- matches, they are separated by <NL> characters.
---
--- If the expansion fails, the result is an empty string.  A name
--- for a non-existing file is not included, unless {string} does
--- not start with '%', '#' or '<', see below.
---
--- When {string} starts with '%', '#' or '<', the expansion is
--- done like for the |cmdline-special| variables with their
--- associated modifiers.  Here is a short overview:
---
---   %    Current file name
---   #    Alternate file name
---   #n    Alternate file name n
---   <cfile>    File name under the cursor
---   <afile>    Autocmd file name
---   <abuf>    Autocmd buffer number (as a String!)
---   <amatch>  Autocmd matched name
---   <cexpr>    C expression under the cursor
---   <sfile>    Deprecated, use <script> or <stack>
---   <slnum>    Sourced script line number or function
---       line number
---   <sflnum>  Script file line number, also when in
---       a function
---   <SID>    "<SNR>123_"  where "123" is the
---       current script ID  |<SID>|
---   <script>  Sourced script file, or script file
---       where the current function was defined.
---       Lua: see |lua-script-location|.
---   <stack>    Call stack
---   <cword>    Word under the cursor
---   <cWORD>    WORD under the cursor
---   <client>  The {clientid} of the last received
---       message
--- Modifiers:
---   :p    Expand to full path
---   :h    Head (last path component removed)
---   :t    Tail (last path component only)
---   :r    Root (one extension removed)
---   :e    Extension only
---
--- More modifiers are supported, for the full list see
--- |filename-modifiers|.
---
--- Example: >vim
---   let &tags = expand("%:p:h") .. "/tags"
--- <Note that when expanding a string that starts with '%', '#' or
--- '<', any following text is ignored.  This does NOT work: >vim
---   let doesntwork = expand("%:h.bak")
--- <Use this: >vim
---   let doeswork = expand("%:h") .. ".bak"
--- <Also note that expanding "<cfile>" and others only returns the
--- referenced file name without further expansion.  If "<cfile>"
--- is "~/.cshrc", you need to do another expand() to have the
--- "~/" expanded into the path of the home directory: >vim
---   echo expand(expand("<cfile>"))
--- <
--- There cannot be white space between the variables and the
--- following modifier.  The |fnamemodify()| function can be used
--- to modify normal file names.
---
--- When using '%' or '#', and the current or alternate file name
--- is not defined, an empty string is used.  Using "%:p" in a
--- buffer with no name, results in the current directory, with a
--- '/' added.
--- When 'verbose' is set then expanding '%', '#' and <> items
--- will result in an error message if the argument cannot be
--- expanded.
---
--- When {string} does not start with '%', '#' or '<', it is
--- expanded like a file name is expanded on the command line.
--- 'suffixes' and 'wildignore' are used, unless the optional
--- {nosuf} argument is given and it is |TRUE|.
--- Names for non-existing files are included.  The "**" item can
--- be used to search in a directory tree.  For example, to find
--- all "README" files in the current directory and below: >vim
---   echo expand("**/README")
--- <
--- expand() can also be used to expand variables and environment
--- variables that are only known in a shell.  But this can be
--- slow, because a shell may be used to do the expansion.  See
--- |expr-env-expand|.
--- The expanded variable is still handled like a list of file
--- names.  When an environment variable cannot be expanded, it is
--- left unchanged.  Thus ":echo expand('$FOOBAR')" results in
--- "$FOOBAR".
---
--- See |glob()| for finding existing files.  See |system()| for
--- getting the raw output of an external command.
---
--- @param string string
--- @param nosuf? boolean
--- @param list? nil|false
--- @return string
function vim.fn.expand(string, nosuf, list) end

--- @param string string
--- @param nosuf boolean
--- @param list true|number|string|table
--- @return string|string[]
function vim.fn.expand(string, nosuf, list) end

--- Expand special items in String {string} like what is done for
--- an Ex command such as `:edit`.  This expands special keywords,
--- like with |expand()|, and environment variables, anywhere in
--- {string}.  "~user" and "~/path" are only expanded at the
--- start.
---
--- The following items are supported in the {options} Dict
--- argument:
---     errmsg  If set to TRUE, error messages are displayed
---     if an error is encountered during expansion.
---     By default, error messages are not displayed.
---
--- Returns the expanded string.  If an error is encountered
--- during expansion, the unmodified {string} is returned.
---
--- Example: >vim
---   echo expandcmd('make %<.o')
--- < >
---   make /path/runtime/doc/builtin.o
--- < >vim
---   echo expandcmd('make %<.o', {'errmsg': v:true})
--- <
---
--- @param string string
--- @param options? table
--- @return any
function vim.fn.expandcmd(string, options) end

--- {expr1} and {expr2} must be both |Lists| or both
--- |Dictionaries|.
---
--- If they are |Lists|: Append {expr2} to {expr1}.
--- If {expr3} is given insert the items of {expr2} before the
--- item with index {expr3} in {expr1}.  When {expr3} is zero
--- insert before the first item.  When {expr3} is equal to
--- len({expr1}) then {expr2} is appended.
--- Examples: >vim
---   echo sort(extend(mylist, [7, 5]))
---   call extend(mylist, [2, 3], 1)
--- <When {expr1} is the same List as {expr2} then the number of
--- items copied is equal to the original length of the List.
--- E.g., when {expr3} is 1 you get N new copies of the first item
--- (where N is the original length of the List).
--- Use |add()| to concatenate one item to a list.  To concatenate
--- two lists into a new list use the + operator: >vim
---   let newlist = [1, 2, 3] + [4, 5]
--- <
--- If they are |Dictionaries|:
--- Add all entries from {expr2} to {expr1}.
--- If a key exists in both {expr1} and {expr2} then {expr3} is
--- used to decide what to do:
--- {expr3} = "keep": keep the value of {expr1}
--- {expr3} = "force": use the value of {expr2}
--- {expr3} = "error": give an error message    *E737*
--- When {expr3} is omitted then "force" is assumed.
---
--- {expr1} is changed when {expr2} is not empty.  If necessary
--- make a copy of {expr1} first or use |extendnew()| to return a
--- new List/Dictionary.
--- {expr2} remains unchanged.
--- When {expr1} is locked and {expr2} is not empty the operation
--- fails.
--- Returns {expr1}.  Returns 0 on error.
---
--- @param expr1 table
--- @param expr2 table
--- @param expr3? table
--- @return any
function vim.fn.extend(expr1, expr2, expr3) end

--- Like |extend()| but instead of adding items to {expr1} a new
--- List or Dictionary is created and returned.  {expr1} remains
--- unchanged.
---
--- @param expr1 table
--- @param expr2 table
--- @param expr3? table
--- @return any
function vim.fn.extendnew(expr1, expr2, expr3) end

--- Characters in {string} are queued for processing as if they
--- come from a mapping or were typed by the user.
---
--- By default the string is added to the end of the typeahead
--- buffer, thus if a mapping is still being executed the
--- characters come after them.  Use the 'i' flag to insert before
--- other characters, they will be executed next, before any
--- characters from a mapping.
---
--- The function does not wait for processing of keys contained in
--- {string}.
---
--- To include special keys into {string}, use double-quotes
--- and "\..." notation |expr-quote|.  For example,
--- feedkeys("\<CR>") simulates pressing of the <Enter> key.  But
--- feedkeys('\<CR>') pushes 5 characters.
--- The |<Ignore>| keycode may be used to exit the
--- wait-for-character without doing anything.
---
--- {mode} is a String, which can contain these character flags:
--- 'm'  Remap keys.  This is default.  If {mode} is absent,
---   keys are remapped.
--- 'n'  Do not remap keys.
--- 't'  Handle keys as if typed; otherwise they are handled as
---   if coming from a mapping.  This matters for undo,
---   opening folds, etc.
--- 'L'  Lowlevel input.  Other flags are not used.
--- 'i'  Insert the string instead of appending (see above).
--- 'x'  Execute commands until typeahead is empty.  This is
---   similar to using ":normal!".  You can call feedkeys()
---   several times without 'x' and then one time with 'x'
---   (possibly with an empty {string}) to execute all the
---   typeahead.  Note that when Vim ends in Insert mode it
---   will behave as if <Esc> is typed, to avoid getting
---   stuck, waiting for a character to be typed before the
---   script continues.
---   Note that if you manage to call feedkeys() while
---   executing commands, thus calling it recursively, then
---   all typeahead will be consumed by the last call.
--- '!'  When used with 'x' will not end Insert mode.  Can be
---   used in a test when a timer is set to exit Insert mode
---   a little later.  Useful for testing CursorHoldI.
---
--- Return value is always 0.
---
--- @param string string
--- @param mode? string
--- @return any
function vim.fn.feedkeys(string, mode) end

--- @deprecated
--- Obsolete name for |filereadable()|.
---
--- @param file string
--- @return any
function vim.fn.file_readable(file) end

--- Copy the file pointed to by the name {from} to {to}.  The
--- result is a Number, which is |TRUE| if the file was copied
--- successfully, and |FALSE| when it failed.
--- If a file with name {to} already exists, it will fail.
--- Note that it does not handle directories (yet).
---
--- This function is not available in the |sandbox|.
---
--- @param from string
--- @param to string
--- @return 0|1
function vim.fn.filecopy(from, to) end

--- Returns |TRUE| if {file} exists, can be read, and is not
--- a directory, else |FALSE|.
---
--- {file} is any expression, which is used as a String. If you
--- don't care about the file being readable you can use |glob()|.
---
--- {file} is used as-is, you may want to expand wildcards first: >vim
---   echo filereadable('~/.vimrc')
--- < >
---   0
--- < >vim
---   echo filereadable(expand('~/.vimrc'))
--- < >
---   1
--- <
---
--- @param file string
--- @return 0|1
function vim.fn.filereadable(file) end

--- Checks whether a file with the name {file} exists and can
--- be written.  Returns 1 if so.  If {file} doesn't exist, or
--- is not writable, the result is 0.  If {file} is a
--- directory, and we can write to it, the result is 2.
---
--- @param file string
--- @return 0|1
function vim.fn.filewritable(file) end

--- {expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
--- For each item in {expr1} evaluate {expr2} and when the result
--- is zero or false remove the item from the |List| or
--- |Dictionary|.  Similarly for each byte in a |Blob| and each
--- character in a |String|.
---
--- {expr2} must be a |string| or |Funcref|.
---
--- If {expr2} is a |string|, inside {expr2} |v:val| has the value
--- of the current item.  For a |Dictionary| |v:key| has the key
--- of the current item and for a |List| |v:key| has the index of
--- the current item.  For a |Blob| |v:key| has the index of the
--- current byte.  For a |String| |v:key| has the index of the
--- current character.
--- Examples: >vim
---   call filter(mylist, 'v:val !~ "OLD"')
--- <Removes the items where "OLD" appears. >vim
---   call filter(mydict, 'v:key >= 8')
--- <Removes the items with a key below 8. >vim
---   call filter(var, 0)
--- <Removes all the items, thus clears the |List| or |Dictionary|.
---
--- Note that {expr2} is the result of expression and is then
--- used as an expression again.  Often it is good to use a
--- |literal-string| to avoid having to double backslashes.
---
--- If {expr2} is a |Funcref| it must take two arguments:
---   1. the key or the index of the current item.
---   2. the value of the current item.
--- The function must return |TRUE| if the item should be kept.
--- Example that keeps the odd items of a list: >vim
---   func Odd(idx, val)
---     return a:idx % 2 == 1
---   endfunc
---   call filter(mylist, function('Odd'))
--- <It is shorter when using a |lambda|: >vim
---   call filter(myList, {idx, val -> idx * val <= 42})
--- <If you do not use "val" you can leave it out: >vim
---   call filter(myList, {idx -> idx % 2 == 1})
--- <
--- For a |List| and a |Dictionary| the operation is done
--- in-place.  If you want it to remain unmodified make a copy
--- first: >vim
---   let l = filter(copy(mylist), 'v:val =~ "KEEP"')
---
--- <Returns {expr1}, the |List| or |Dictionary| that was filtered,
--- or a new |Blob| or |String|.
--- When an error is encountered while evaluating {expr2} no
--- further items in {expr1} are processed.
--- When {expr2} is a Funcref errors inside a function are
--- ignored, unless it was defined with the "abort" flag.
---
--- @param expr1 string|table
--- @param expr2 string|function
--- @return any
function vim.fn.filter(expr1, expr2) end

--- Find directory {name} in {path}.  Supports both downwards and
--- upwards recursive directory searches.  See |file-searching|
--- for the syntax of {path}.
---
--- Returns the path of the first found match.  When the found
--- directory is below the current directory a relative path is
--- returned.  Otherwise a full path is returned.
--- If {path} is omitted or empty then 'path' is used.
---
--- If the optional {count} is given, find {count}'s occurrence of
--- {name} in {path} instead of the first one.
--- When {count} is negative return all the matches in a |List|.
---
--- Returns an empty string if the directory is not found.
---
--- This is quite similar to the ex-command `:find`.
---
--- @param name string
--- @param path? string
--- @param count? integer
--- @return string|string[]
function vim.fn.finddir(name, path, count) end

--- Just like |finddir()|, but find a file instead of a directory.
--- Uses 'suffixesadd'.
--- Example: >vim
---   echo findfile("tags.vim", ".;")
--- <Searches from the directory of the current file upwards until
--- it finds the file "tags.vim".
---
--- @param name string
--- @param path? string
--- @param count? integer
--- @return string|string[]
function vim.fn.findfile(name, path, count) end

--- Flatten {list} up to {maxdepth} levels.  Without {maxdepth}
--- the result is a |List| without nesting, as if {maxdepth} is
--- a very large number.
--- The {list} is changed in place, use |flattennew()| if you do
--- not want that.
---           *E900*
--- {maxdepth} means how deep in nested lists changes are made.
--- {list} is not modified when {maxdepth} is 0.
--- {maxdepth} must be positive number.
---
--- If there is an error the number zero is returned.
---
--- Example: >vim
---   echo flatten([1, [2, [3, 4]], 5])
--- <  [1, 2, 3, 4, 5] >vim
---   echo flatten([1, [2, [3, 4]], 5], 1)
--- <  [1, 2, [3, 4], 5]
---
--- @param list any[]
--- @param maxdepth? integer
--- @return any[]|0
function vim.fn.flatten(list, maxdepth) end

--- Like |flatten()| but first make a copy of {list}.
---
--- @param list any[]
--- @param maxdepth? integer
--- @return any[]|0
function vim.fn.flattennew(list, maxdepth) end

--- Convert {expr} to a Number by omitting the part after the
--- decimal point.
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0 if {expr} is not a |Float| or a |Number|.
--- When the value of {expr} is out of range for a |Number| the
--- result is truncated to 0x7fffffff or -0x7fffffff (or when
--- 64-bit Number support is enabled, 0x7fffffffffffffff or
--- -0x7fffffffffffffff).  NaN results in -0x80000000 (or when
--- 64-bit Number support is enabled, -0x8000000000000000).
--- Examples: >vim
---   echo float2nr(3.95)
--- <  3  >vim
---   echo float2nr(-23.45)
--- <  -23  >vim
---   echo float2nr(1.0e100)
--- <  2147483647  (or 9223372036854775807) >vim
---   echo float2nr(-1.0e150)
--- <  -2147483647 (or -9223372036854775807) >vim
---   echo float2nr(1.0e-100)
--- <  0
---
--- @param expr number
--- @return any
function vim.fn.float2nr(expr) end

--- Return the largest integral value less than or equal to
--- {expr} as a |Float| (round down).
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo floor(1.856)
--- <  1.0  >vim
---   echo floor(-5.456)
--- <  -6.0  >vim
---   echo floor(4.0)
--- <  4.0
---
--- @param expr number
--- @return any
function vim.fn.floor(expr) end

--- Return the remainder of {expr1} / {expr2}, even if the
--- division is not representable.  Returns {expr1} - i * {expr2}
--- for some integer i such that if {expr2} is non-zero, the
--- result has the same sign as {expr1} and magnitude less than
--- the magnitude of {expr2}.  If {expr2} is zero, the value
--- returned is zero.  The value returned is a |Float|.
--- {expr1} and {expr2} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr1} or {expr2} is not a |Float| or a
--- |Number|.
--- Examples: >vim
---   echo fmod(12.33, 1.22)
--- <  0.13 >vim
---   echo fmod(-12.33, 1.22)
--- <  -0.13
---
--- @param expr1 number
--- @param expr2 number
--- @return any
function vim.fn.fmod(expr1, expr2) end

--- Escape {string} for use as file name command argument.  All
--- characters that have a special meaning, such as `'%'` and `'|'`
--- are escaped with a backslash. For most systems the characters
--- escaped are: >
---   \t\n *?[{`$\\%#'\"|!<
--- <For systems where a backslash appears in a filename, it
--- depends on the value of 'isfname'. A leading '+' and '>' is
--- also escaped (special after |:edit| and |:write|).  And a "-"
--- by itself (special after |:cd|).
--- Returns an empty string on error.
--- Example: >vim
---   let fname = '+some str%nge|name'
---   exe "edit " .. fnameescape(fname)
--- <results in executing: >vim
---   edit \+some\ str\%nge\|name
--- <
---
--- @param string string
--- @return string
function vim.fn.fnameescape(string) end

--- Modify file name {fname} according to {mods}.  {mods} is a
--- string of characters like it is used for file names on the
--- command line.  See |filename-modifiers|.
--- Example: >vim
---   echo fnamemodify("main.c", ":p:h")
--- <results in: >
---   /home/user/vim/vim/src
--- <If {mods} is empty or an unsupported modifier is used then
--- {fname} is returned.
--- When {fname} is empty then with {mods} ":h" returns ".", so
--- that `:cd` can be used with it.  This is different from
--- expand('%:h') without a buffer name, which returns an empty
--- string.
--- Note: Environment variables don't work in {fname}, use
--- |expand()| first then.
---
--- @param fname string
--- @param mods string
--- @return string
function vim.fn.fnamemodify(fname, mods) end

--- Returns the first line number of the closed fold containing
--- line {lnum}.  If the line {lnum} is not in a closed fold,
--- -1 is returned.
--- {lnum} is used like with |getline()|.  Thus "." is the current
--- line, "'m" mark m, etc.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.foldclosed(lnum) end

--- Returns the last line number of the closed fold containing
--- line {lnum}.  If the line {lnum} is not in a closed fold,
--- -1 is returned.
--- {lnum} is used like with |getline()|.  Thus "." is the current
--- line, "'m" mark m, etc.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.foldclosedend(lnum) end

--- Returns the fold nesting level of line {lnum} in the current
--- buffer.  {lnum} is used like with |getline()| ("." is the
--- current line, "'m" mark m, etc).
---
--- For nested folds the deepest level is returned.  If there is
--- no fold at line {lnum}, zero is returned.  It doesn't matter
--- if the folds are open or closed. When used while updating
--- folds (from 'foldexpr') -1 is returned for lines where folds
--- are still to be updated and the foldlevel is unknown.  As
--- a special case the level of the previous line is usually
--- available.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.foldlevel(lnum) end

--- Returns a String, to be displayed for a closed fold.  This is
--- the default function used for the 'foldtext' option and should
--- only be called from evaluating 'foldtext'.  It uses the
--- |v:foldstart|, |v:foldend| and |v:folddashes| variables.
--- The returned string looks like this: >
---   +-- 45 lines: abcdef
--- <The number of leading dashes depends on the foldlevel.  The
--- "45" is the number of lines in the fold.  "abcdef" is the text
--- in the first non-blank line of the fold.  Leading white space,
--- "//" or "/*" and the text from the 'foldmarker' and
--- 'commentstring' options is removed.
--- When used to draw the actual foldtext, the rest of the line
--- will be filled with the fold char from the 'fillchars'
--- setting.
--- Returns an empty string when there is no fold.
---
--- @return string
function vim.fn.foldtext() end

--- Returns the text that is displayed for the closed fold at line
--- {lnum}.  Evaluates 'foldtext' in the appropriate context.
--- When there is no closed fold at {lnum} an empty string is
--- returned.
--- {lnum} is used like with |getline()|.  Thus "." is the current
--- line, "'m" mark m, etc.
--- Useful when exporting folded text, e.g., to HTML.
---
--- @param lnum integer|string
--- @return string
function vim.fn.foldtextresult(lnum) end

--- {expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
--- For each item in {expr1} execute {expr2}.  {expr1} is not
--- modified; its values may be, as with |:lockvar| 1. |E741|
--- See |map()| and |filter()| to modify {expr1}.
---
--- {expr2} must be a |string| or |Funcref|.
---
--- If {expr2} is a |string|, inside {expr2} |v:val| has the value
--- of the current item.  For a |Dictionary| |v:key| has the key
--- of the current item and for a |List| |v:key| has the index of
--- the current item.  For a |Blob| |v:key| has the index of the
--- current byte.  For a |String| |v:key| has the index of the
--- current character.
--- Examples: >vim
---   call foreach(mylist, 'let used[v:val] = v:true')
--- <This records the items that are in the {expr1} list.
---
--- Note that {expr2} is the result of expression and is then used
--- as a command.  Often it is good to use a |literal-string| to
--- avoid having to double backslashes.
---
--- If {expr2} is a |Funcref| it must take two arguments:
---   1. the key or the index of the current item.
---   2. the value of the current item.
--- With a lambda you don't get an error if it only accepts one
--- argument.
--- If the function returns a value, it is ignored.
---
--- Returns {expr1} in all cases.
--- When an error is encountered while executing {expr2} no
--- further items in {expr1} are processed.
--- When {expr2} is a Funcref errors inside a function are
--- ignored, unless it was defined with the "abort" flag.
---
--- @param expr1 string|table
--- @param expr2 string|function
--- @return string|table
function vim.fn.foreach(expr1, expr2) end

--- Get the full command name from a short abbreviated command
--- name; see |20.2| for details on command abbreviations.
---
--- The string argument {name} may start with a `:` and can
--- include a [range], these are skipped and not returned.
--- Returns an empty string if a command doesn't exist or if it's
--- ambiguous (for user-defined commands).
---
--- For example `fullcommand('s')`, `fullcommand('sub')`,
--- `fullcommand(':%substitute')` all return "substitute".
---
--- @param name string
--- @return string
function vim.fn.fullcommand(name) end

--- Just like |function()|, but the returned Funcref will lookup
--- the function by reference, not by name.  This matters when the
--- function {name} is redefined later.
---
--- Unlike |function()|, {name} must be an existing user function.
--- It only works for an autoloaded function if it has already
--- been loaded (to avoid mistakenly loading the autoload script
--- when only intending to use the function name, use |function()|
--- instead).  {name} cannot be a builtin function.
--- Returns 0 on error.
---
--- @param name string
--- @param arglist? any
--- @param dict? any
--- @return any
function vim.fn.funcref(name, arglist, dict) end

--- Return a |Funcref| variable that refers to function {name}.
--- {name} can be the name of a user defined function or an
--- internal function.
---
--- {name} can also be a Funcref or a partial. When it is a
--- partial the dict stored in it will be used and the {dict}
--- argument is not allowed.  E.g.: >vim
---   let FuncWithArg = function(dict.Func, [arg])
---   let Broken = function(dict.Func, [arg], dict)
--- <
--- When using the Funcref the function will be found by {name},
--- also when it was redefined later. Use |funcref()| to keep the
--- same function.
---
--- When {arglist} or {dict} is present this creates a partial.
--- That means the argument list and/or the dictionary is stored
--- in the Funcref and will be used when the Funcref is called.
---
--- The arguments are passed to the function in front of other
--- arguments, but after any argument from |method|.  Example: >vim
---   func Callback(arg1, arg2, name)
---   "...
---   endfunc
---   let Partial = function('Callback', ['one', 'two'])
---   "...
---   call Partial('name')
--- <Invokes the function as with: >vim
---   call Callback('one', 'two', 'name')
---
--- <With a |method|: >vim
---   func Callback(one, two, three)
---   "...
---   endfunc
---   let Partial = function('Callback', ['two'])
---   "...
---   eval 'one'->Partial('three')
--- <Invokes the function as with: >vim
---   call Callback('one', 'two', 'three')
---
--- <The function() call can be nested to add more arguments to the
--- Funcref.  The extra arguments are appended to the list of
--- arguments.  Example: >vim
---   func Callback(arg1, arg2, name)
---   "...
---   endfunc
---   let Func = function('Callback', ['one'])
---   let Func2 = function(Func, ['two'])
---   "...
---   call Func2('name')
--- <Invokes the function as with: >vim
---   call Callback('one', 'two', 'name')
---
--- <The Dictionary is only useful when calling a "dict" function.
--- In that case the {dict} is passed in as "self".  Example: >vim
---   function Callback() dict
---      echo "called for " .. self.name
---   endfunction
---   "...
---   let context = {"name": "example"}
---   let Func = function('Callback', context)
---   "...
---   call Func()  " will echo: called for example
--- <The use of function() is not needed when there are no extra
--- arguments, these two are equivalent, if Callback() is defined
--- as context.Callback(): >vim
---   let Func = function('Callback', context)
---   let Func = context.Callback
---
--- <The argument list and the Dictionary can be combined: >vim
---   function Callback(arg1, count) dict
---   "...
---   endfunction
---   let context = {"name": "example"}
---   let Func = function('Callback', ['one'], context)
---   "...
---   call Func(500)
--- <Invokes the function as with: >vim
---   call context.Callback('one', 500)
--- <
--- Returns 0 on error.
---
--- @param name string
--- @param arglist? any
--- @param dict? any
--- @return any
vim.fn['function'] = function(name, arglist, dict) end

--- Cleanup unused |Lists| and |Dictionaries| that have circular
--- references.
---
--- There is hardly ever a need to invoke this function, as it is
--- automatically done when Vim runs out of memory or is waiting
--- for the user to press a key after 'updatetime'.  Items without
--- circular references are always freed when they become unused.
--- This is useful if you have deleted a very big |List| and/or
--- |Dictionary| with circular references in a script that runs
--- for a long time.
---
--- When the optional {atexit} argument is one, garbage
--- collection will also be done when exiting Vim, if it wasn't
--- done before.  This is useful when checking for memory leaks.
---
--- The garbage collection is not done immediately but only when
--- it's safe to perform.  This is when waiting for the user to
--- type a character.
---
--- @param atexit? boolean
--- @return any
function vim.fn.garbagecollect(atexit) end

--- Get item {idx} from |List| {list}.  When this item is not
--- available return {default}.  Return zero when {default} is
--- omitted.
---
--- @param list any[]
--- @param idx integer
--- @param default? any
--- @return any
function vim.fn.get(list, idx, default) end

--- Get byte {idx} from |Blob| {blob}.  When this byte is not
--- available return {default}.  Return -1 when {default} is
--- omitted.
---
--- @param blob string
--- @param idx integer
--- @param default? any
--- @return any
function vim.fn.get(blob, idx, default) end

--- Get item with key {key} from |Dictionary| {dict}.  When this
--- item is not available return {default}.  Return zero when
--- {default} is omitted.  Useful example: >vim
---   let val = get(g:, 'var_name', 'default')
--- <This gets the value of g:var_name if it exists, and uses
--- "default" when it does not exist.
---
--- @param dict table<string,any>
--- @param key string
--- @param default? any
--- @return any
function vim.fn.get(dict, key, default) end

--- Get item {what} from |Funcref| {func}.  Possible values for
--- {what} are:
---   "name"    The function name
---   "func"    The function
---   "dict"    The dictionary
---   "args"    The list with arguments
---   "arity"   A dictionary with information about the number of
---       arguments accepted by the function (minus the
---       {arglist}) with the following fields:
---     required    the number of positional arguments
---     optional    the number of optional arguments,
---           in addition to the required ones
---     varargs     |TRUE| if the function accepts a
---           variable number of arguments |...|
---
---     Note: There is no error, if the {arglist} of
---     the Funcref contains more arguments than the
---     Funcref expects, it's not validated.
---
--- Returns zero on error.
---
--- @param func function
--- @param what string
--- @return any
function vim.fn.get(func, what) end

--- @param buf? integer|string
--- @return vim.fn.getbufinfo.ret.item[]
function vim.fn.getbufinfo(buf) end

--- Get information about buffers as a List of Dictionaries.
---
--- Without an argument information about all the buffers is
--- returned.
---
--- When the argument is a |Dictionary| only the buffers matching
--- the specified criteria are returned.  The following keys can
--- be specified in {dict}:
---   buflisted  include only listed buffers.
---   bufloaded  include only loaded buffers.
---   bufmodified  include only modified buffers.
---
--- Otherwise, {buf} specifies a particular buffer to return
--- information for.  For the use of {buf}, see |bufname()|
--- above.  If the buffer is found the returned List has one item.
--- Otherwise the result is an empty list.
---
--- Each returned List item is a dictionary with the following
--- entries:
---   bufnr    Buffer number.
---   changed    TRUE if the buffer is modified.
---   changedtick  Number of changes made to the buffer.
---   command    TRUE if the buffer belongs to the
---       command-line window |cmdwin|.
---   hidden    TRUE if the buffer is hidden.
---   lastused  Timestamp in seconds, like
---       |localtime()|, when the buffer was
---       last used.
---   listed    TRUE if the buffer is listed.
---   lnum    Line number used for the buffer when
---       opened in the current window.
---       Only valid if the buffer has been
---       displayed in the window in the past.
---       If you want the line number of the
---       last known cursor position in a given
---       window, use |line()|: >vim
---         echo line('.', {winid})
--- <
---   linecount  Number of lines in the buffer (only
---       valid when loaded)
---   loaded    TRUE if the buffer is loaded.
---   name    Full path to the file in the buffer.
---   signs    List of signs placed in the buffer.
---       Each list item is a dictionary with
---       the following fields:
---           id    sign identifier
---           lnum  line number
---           name  sign name
---   variables  A reference to the dictionary with
---       buffer-local variables.
---   windows    List of |window-ID|s that display this
---       buffer
---
--- Examples: >vim
---   for buf in getbufinfo()
---       echo buf.name
---   endfor
---   for buf in getbufinfo({'buflisted':1})
---       if buf.changed
---     " ....
---       endif
---   endfor
--- <
--- To get buffer-local options use: >vim
---   getbufvar({bufnr}, '&option_name')
--- <
---
--- @param dict? vim.fn.getbufinfo.dict
--- @return vim.fn.getbufinfo.ret.item[]
function vim.fn.getbufinfo(dict) end

--- Return a |List| with the lines starting from {lnum} to {end}
--- (inclusive) in the buffer {buf}.  If {end} is omitted, a
--- |List| with only the line {lnum} is returned.  See
--- `getbufoneline()` for only getting the line.
---
--- For the use of {buf}, see |bufname()| above.
---
--- For {lnum} and {end} "$" can be used for the last line of the
--- buffer.  Otherwise a number must be used.
---
--- When {lnum} is smaller than 1 or bigger than the number of
--- lines in the buffer, an empty |List| is returned.
---
--- When {end} is greater than the number of lines in the buffer,
--- it is treated as {end} is set to the number of lines in the
--- buffer.  When {end} is before {lnum} an empty |List| is
--- returned.
---
--- This function works only for loaded buffers.  For unloaded and
--- non-existing buffers, an empty |List| is returned.
---
--- Example: >vim
---   let lines = getbufline(bufnr("myfile"), 1, "$")
--- <
---
--- @param buf integer|string
--- @param lnum integer
--- @param end_? integer
--- @return string[]
function vim.fn.getbufline(buf, lnum, end_) end

--- Just like `getbufline()` but only get one line and return it
--- as a string.
---
--- @param buf integer|string
--- @param lnum integer
--- @return string
function vim.fn.getbufoneline(buf, lnum) end

--- The result is the value of option or local buffer variable
--- {varname} in buffer {buf}.  Note that the name without "b:"
--- must be used.
--- The {varname} argument is a string.
--- When {varname} is empty returns a |Dictionary| with all the
--- buffer-local variables.
--- When {varname} is equal to "&" returns a |Dictionary| with all
--- the buffer-local options.
--- Otherwise, when {varname} starts with "&" returns the value of
--- a buffer-local option.
--- This also works for a global or buffer-local option, but it
--- doesn't work for a global variable, window-local variable or
--- window-local option.
--- For the use of {buf}, see |bufname()| above.
--- When the buffer or variable doesn't exist {def} or an empty
--- string is returned, there is no error message.
--- Examples: >vim
---   let bufmodified = getbufvar(1, "&mod")
---   echo "todo myvar = " .. getbufvar("todo", "myvar")
--- <
---
--- @param buf integer|string
--- @param varname string
--- @param def? any
--- @return any
function vim.fn.getbufvar(buf, varname, def) end

--- Returns a |List| of cell widths of character ranges overridden
--- by |setcellwidths()|.  The format is equal to the argument of
--- |setcellwidths()|.  If no character ranges have their cell
--- widths overridden, an empty List is returned.
---
--- @return any
function vim.fn.getcellwidths() end

--- Returns the |changelist| for the buffer {buf}.  For the use
--- of {buf}, see |bufname()| above.  If buffer {buf} doesn't
--- exist, an empty list is returned.
---
--- The returned list contains two entries: a list with the change
--- locations and the current position in the list.  Each
--- entry in the change list is a dictionary with the following
--- entries:
---   col    column number
---   coladd    column offset for 'virtualedit'
---   lnum    line number
--- If buffer {buf} is the current buffer, then the current
--- position refers to the position in the list.  For other
--- buffers, it is set to the length of the list.
---
--- @param buf? integer|string
--- @return table[]
function vim.fn.getchangelist(buf) end

--- Get a single character from the user or input stream.
--- If {expr} is omitted or is -1, wait until a character is
---   available.
--- If {expr} is 0, only get a character when one is available.
---   Return zero otherwise.
--- If {expr} is 1, only check if a character is available, it is
---   not consumed.  Return zero if no character available.
--- To always get a string, specify "number" as |FALSE| in {opts}.
---
--- Without {expr} and when {expr} is 0 a whole character or
--- special key is returned.  If it is a single character, the
--- result is a Number.  Use |nr2char()| to convert it to a String.
--- Otherwise a String is returned with the encoded character.
--- For a special key it's a String with a sequence of bytes
--- starting with 0x80 (decimal: 128).  This is the same value as
--- the String "\<Key>", e.g., "\<Left>".  The returned value is
--- also a String when a modifier (shift, control, alt) was used
--- that is not included in the character.  |keytrans()| can also
--- be used to convert a returned String into a readable form.
---
--- When {expr} is 0 and Esc is typed, there will be a short delay
--- while Vim waits to see if this is the start of an escape
--- sequence.
---
--- When {expr} is 1 only the first byte is returned.  For a
--- one-byte character it is the character itself as a number.
--- Use |nr2char()| to convert it to a String.
---
--- Use |getcharmod()| to obtain any additional modifiers.
---
--- The optional argument {opts} is a Dict and supports the
--- following items:
---
---   cursor    A String specifying cursor behavior
---       when waiting for a character.
---       "hide": hide the cursor.
---       "keep": keep current cursor unchanged.
---       "msg": move cursor to message area.
---       (default: automagically decide
---       between "keep" and "msg")
---
---   number    If |TRUE|, return a Number when getting
---       a single character.
---       If |FALSE|, the return value is always
---       converted to a String, and an empty
---       String (instead of 0) is returned when
---       no character is available.
---       (default: |TRUE|)
---
---   simplify  If |TRUE|, include modifiers in the
---       character if possible.  E.g., return
---       the same value for CTRL-I and <Tab>.
---       If |FALSE|, don't include modifiers in
---       the character.
---       (default: |TRUE|)
---
--- When the user clicks a mouse button, the mouse event will be
--- returned.  The position can then be found in |v:mouse_col|,
--- |v:mouse_lnum|, |v:mouse_winid| and |v:mouse_win|.
--- |getmousepos()| can also be used.  Mouse move events will be
--- ignored.
--- This example positions the mouse as it would normally happen: >vim
---   let c = getchar()
---   if c == "\<LeftMouse>" && v:mouse_win > 0
---     exe v:mouse_win .. "wincmd w"
---     exe v:mouse_lnum
---     exe "normal " .. v:mouse_col .. "|"
---   endif
--- <
--- There is no prompt, you will somehow have to make clear to the
--- user that a character has to be typed.  The screen is not
--- redrawn, e.g. when resizing the window.
---
--- There is no mapping for the character.
--- Key codes are replaced, thus when the user presses the <Del>
--- key you get the code for the <Del> key, not the raw character
--- sequence.  Examples: >vim
---   getchar() == "\<Del>"
---   getchar() == "\<S-Left>"
--- <This example redefines "f" to ignore case: >vim
---   nmap f :call FindChar()<CR>
---   function FindChar()
---     let c = nr2char(getchar())
---     while col('.') < col('$') - 1
---       normal l
---       if getline('.')[col('.') - 1] ==? c
---         break
---       endif
---     endwhile
---   endfunction
--- <
---
--- @param expr? -1|0|1
--- @param opts? table
--- @return integer|string
function vim.fn.getchar(expr, opts) end

--- Returns the state of the keyboard modifiers for the last
--- character obtained with |getchar()| or in another way.
--- These values are added together:
---   2  shift
---   4  control
---   8  alt (meta)
---   16  meta (when it's different from ALT)
---   32  mouse double click
---   64  mouse triple click
---   96  mouse quadruple click (== 32 + 64)
---   128  command (Mac) or super
--- Only the modifiers that have not been included in the
--- character itself are obtained.  Thus Shift-a results in "A"
--- without a modifier.  Returns 0 if no modifiers are used.
---
--- @return integer
function vim.fn.getcharmod() end

--- Get the position for String {expr}.  Same as |getpos()| but the
--- column number in the returned List is a character index
--- instead of a byte index.
--- If |getpos()| returns a very large column number, equal to
--- |v:maxcol|, then getcharpos() will return the character index
--- of the last character.
---
--- Example:
--- With the cursor on '세' in line 5 with text "여보세요": >vim
---   getcharpos('.')    returns [0, 5, 3, 0]
---   getpos('.')    returns [0, 5, 7, 0]
--- <
---
--- @param expr string
--- @return integer[]
function vim.fn.getcharpos(expr) end

--- Return the current character search information as a {dict}
--- with the following entries:
---
---     char  character previously used for a character
---     search (|t|, |f|, |T|, or |F|); empty string
---     if no character search has been performed
---     forward  direction of character search; 1 for forward,
---     0 for backward
---     until  type of character search; 1 for a |t| or |T|
---     character search, 0 for an |f| or |F|
---     character search
---
--- This can be useful to always have |;| and |,| search
--- forward/backward regardless of the direction of the previous
--- character search: >vim
---   nnoremap <expr> ; getcharsearch().forward ? ';' : ','
---   nnoremap <expr> , getcharsearch().forward ? ',' : ';'
--- <Also see |setcharsearch()|.
---
--- @return { char: string, forward: 1|0, until: 1|0 }
function vim.fn.getcharsearch() end

--- The same as |getchar()|, except that this always returns a
--- String, and "number" isn't allowed in {opts}.
---
--- @param expr? -1|0|1
--- @param opts? table
--- @return string
function vim.fn.getcharstr(expr, opts) end

--- Return completion pattern of the current command-line.
--- Only works when the command line is being edited, thus
--- requires use of |c_CTRL-\_e| or |c_CTRL-R_=|.
--- Also see |getcmdtype()|, |setcmdpos()|, |getcmdline()|,
--- |getcmdprompt()|, |getcmdcompltype()| and |setcmdline()|.
--- Returns an empty string when completion is not defined.
---
--- @return string
function vim.fn.getcmdcomplpat() end

--- Return the type of the current command-line completion.
--- Only works when the command line is being edited, thus
--- requires use of |c_CTRL-\_e| or |c_CTRL-R_=|.
--- See |:command-completion| for the return string.
--- Also see |getcmdtype()|, |setcmdpos()|, |getcmdline()|,
--- |getcmdprompt()|, |getcmdcomplpat()| and |setcmdline()|.
--- Returns an empty string when completion is not defined.
---
--- To get the type of the command-line completion for a specified
--- string, use |getcompletiontype()|.
---
--- @return string
function vim.fn.getcmdcompltype() end

--- Return the current command-line input.  Only works when the
--- command line is being edited, thus requires use of
--- |c_CTRL-\_e| or |c_CTRL-R_=|.
--- Example: >vim
---   cmap <F7> <C-\>eescape(getcmdline(), ' \')<CR>
--- <Also see |getcmdtype()|, |getcmdpos()|, |setcmdpos()|,
--- |getcmdprompt()| and |setcmdline()|.
--- Returns an empty string when entering a password or using
--- |inputsecret()|.
---
--- @return string
function vim.fn.getcmdline() end

--- Return the position of the cursor in the command line as a
--- byte count.  The first column is 1.
--- Only works when editing the command line, thus requires use of
--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
--- Returns 0 otherwise.
--- Also see |getcmdtype()|, |setcmdpos()|, |getcmdline()|,
--- |getcmdprompt()| and |setcmdline()|.
---
--- @return integer
function vim.fn.getcmdpos() end

--- Return the current command-line prompt when using functions
--- like |input()| or |confirm()|.
--- Only works when the command line is being edited, thus
--- requires use of |c_CTRL-\_e| or |c_CTRL-R_=|.
--- Also see |getcmdtype()|, |getcmdline()|, |getcmdpos()|,
--- |setcmdpos()| and |setcmdline()|.
---
--- @return string
function vim.fn.getcmdprompt() end

--- Return the screen position of the cursor in the command line
--- as a byte count.  The first column is 1.
--- Instead of |getcmdpos()|, it adds the prompt position.
--- Only works when editing the command line, thus requires use of
--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
--- Returns 0 otherwise.
--- Also see |getcmdpos()|, |setcmdpos()|, |getcmdline()| and
--- |setcmdline()|.
---
--- @return integer
function vim.fn.getcmdscreenpos() end

--- Return the current command-line type.  Possible return values
--- are:
---     :  normal Ex command
---     >  debug mode command |debug-mode|
---     /  forward search command
---     ?  backward search command
---     \@  |input()| command
---     `-`  |:insert| or |:append| command
---     =  |i_CTRL-R_=|
--- Only works when editing the command line, thus requires use of
--- |c_CTRL-\_e| or |c_CTRL-R_=| or an expression mapping.
--- Returns an empty string otherwise.
--- Also see |getcmdpos()|, |setcmdpos()| and |getcmdline()|.
---
--- @return ':'|'>'|'/'|'?'|'@'|'-'|'='|''
function vim.fn.getcmdtype() end

--- Return the current |command-line-window| type.  Possible return
--- values are the same as |getcmdtype()|.  Returns an empty string
--- when not in the command-line window.
---
--- @return ':'|'>'|'/'|'?'|'@'|'-'|'='|''
function vim.fn.getcmdwintype() end

--- Return a list of command-line completion matches.  The String
--- {type} argument specifies what for.  The following completion
--- types are supported:
---
--- arglist    file names in argument list
--- augroup    autocmd groups
--- buffer    buffer names
--- breakpoint  |:breakadd| and |:breakdel| suboptions
--- cmdline    |cmdline-completion| result
--- color    color schemes
--- command    Ex command
--- compiler  compilers
--- custom,{func}  custom completion, defined via {func}
--- customlist,{func} custom completion, defined via {func}
--- diff_buffer  |:diffget| and |:diffput| completion
--- dir    directory names
--- dir_in_path  directory names in 'cdpath'
--- environment  environment variable names
--- event    autocommand events
--- expression  Vim expression
--- file    file and directory names
--- file_in_path  file and directory names in 'path'
--- filetype  filetype names 'filetype'
--- filetypecmd  |:filetype| suboptions
--- function  function name
--- help    help subjects
--- highlight  highlight groups
--- history    |:history| suboptions
--- keymap    keyboard mappings
--- locale    locale names (as output of locale -a)
--- mapclear  buffer argument
--- mapping    mapping name
--- menu    menus
--- messages  |:messages| suboptions
--- option    options
--- packadd    optional package |pack-add| names
--- retab    |:retab| suboptions
--- runtime    |:runtime| completion
--- scriptnames  sourced script names |:scriptnames|
--- shellcmd  Shell command
--- shellcmdline  Shell command line with filename arguments
--- sign    |:sign| suboptions
--- syntax    syntax file names 'syntax'
--- syntime    |:syntime| suboptions
--- tag    tags
--- tag_listfiles  tags, file names
--- user    user names
--- var    user variables
---
--- If {pat} is an empty string, then all the matches are
--- returned.  Otherwise only items matching {pat} are returned.
--- See |wildcards| for the use of special characters in {pat}.
---
--- If the optional {filtered} flag is set to 1, then 'wildignore'
--- is applied to filter the results.  Otherwise all the matches
--- are returned.  The 'wildignorecase' option always applies.
---
--- If the 'wildoptions' option contains "fuzzy", then fuzzy
--- matching is used to get the completion matches.  Otherwise
--- regular expression matching is used.  Thus this function
--- follows the user preference, what happens on the command line.
--- If you do not want this you can make 'wildoptions' empty
--- before calling getcompletion() and restore it afterwards.
---
--- If {type} is "cmdline", then the |cmdline-completion| result is
--- returned.  For example, to complete the possible values after
--- a ":call" command: >vim
---   echo getcompletion('call ', 'cmdline')
--- <
--- If there are no matches, an empty list is returned.  An
--- invalid value for {type} produces an error.
---
--- @param pat string
--- @param type string
--- @param filtered? boolean
--- @return string[]
function vim.fn.getcompletion(pat, type, filtered) end

--- Return the type of the command-line completion using {pat}.
--- When no corresponding completion type is found, an empty
--- string is returned.
--- To get the current command-line completion type, use
--- |getcmdcompltype()|.
---
--- @param pat string
--- @return string
function vim.fn.getcompletiontype(pat) end

--- Get the position of the cursor.  This is like getpos('.'), but
--- includes an extra "curswant" item in the list:
---     [0, lnum, col, off, curswant] ~
--- The "curswant" number is the preferred column when moving the
--- cursor vertically.  After |$| command it will be a very large
--- number equal to |v:maxcol|.  Also see |getcursorcharpos()| and
--- |getpos()|.
--- The first "bufnum" item is always zero.  The byte position of
--- the cursor is returned in "col".  To get the character
--- position, use |getcursorcharpos()|.
---
--- The optional {winid} argument can specify the window.  It can
--- be the window number or the |window-ID|.  The last known
--- cursor position is returned, this may be invalid for the
--- current value of the buffer if it is not the current window.
--- If {winid} is invalid a list with zeroes is returned.
---
--- This can be used to save and restore the cursor position: >vim
---   let save_cursor = getcurpos()
---   MoveTheCursorAround
---   call setpos('.', save_cursor)
--- <Note that this only works within the window.  See
--- |winrestview()| for restoring more state.
---
--- @param winid? integer
--- @return [integer, integer, integer, integer, integer]
function vim.fn.getcurpos(winid) end

--- Same as |getcurpos()| but the column number in the returned
--- List is a character index instead of a byte index.
---
--- Example:
--- With the cursor on '보' in line 3 with text "여보세요": >vim
---   getcursorcharpos()  " returns [0, 3, 2, 0, 3]
---   getcurpos()    " returns [0, 3, 4, 0, 3]
--- <
---
--- @param winid? integer
--- @return any
function vim.fn.getcursorcharpos(winid) end

--- With no arguments, returns the name of the effective
--- |current-directory|. With {winnr} or {tabnr} the working
--- directory of that scope is returned, and 'autochdir' is
--- ignored. Tabs and windows are identified by their respective
--- numbers, 0 means current tab or window. Missing tab number
--- implies 0. Thus the following are equivalent: >vim
---   getcwd(0)
---   getcwd(0, 0)
--- <If {winnr} is -1 it is ignored, only the tab is resolved.
--- {winnr} can be the window number or the |window-ID|.
--- If both {winnr} and {tabnr} are -1 the global working
--- directory is returned.
--- Note: When {tabnr} is -1 Vim returns an empty string to
--- signal that it is invalid, whereas Nvim returns either the
--- global working directory if {winnr} is -1 or the working
--- directory of the window indicated by {winnr}.
--- Throw error if the arguments are invalid. |E5000| |E5001| |E5002|
---
--- @param winnr? integer
--- @param tabnr? integer
--- @return string
function vim.fn.getcwd(winnr, tabnr) end

--- Return the value of environment variable {name}.  The {name}
--- argument is a string, without a leading '$'.  Example: >vim
---   myHome = getenv('HOME')
---
--- <When the variable does not exist |v:null| is returned.  That
--- is different from a variable set to an empty string.
--- See also |expr-env|.
---
--- @param name string
--- @return string
function vim.fn.getenv(name) end

--- Without an argument returns the name of the normal font being
--- used.  Like what is used for the Normal highlight group
--- |hl-Normal|.
--- With an argument a check is done whether String {name} is a
--- valid font name.  If not then an empty string is returned.
--- Otherwise the actual font name is returned, or {name} if the
--- GUI does not support obtaining the real name.
--- Only works when the GUI is running, thus not in your vimrc or
--- gvimrc file.  Use the |GUIEnter| autocommand to use this
--- function just after the GUI has started.
---
--- @param name? string
--- @return string
function vim.fn.getfontname(name) end

--- Returns the file permissions of the given file {fname} as a
--- String.  If {fname} does not exist or its directory cannot be
--- read, an empty string is returned.
--- The result is of the form "rwxrwxrwx", where each group of
--- "rwx" flags represent, in turn, the permissions of the owner
--- of the file, the group the file belongs to, and other users.
--- If a user does not have a given permission the flag for this
--- is replaced with the string "-".  Examples: >vim
---   echo getfperm("/etc/passwd")
---   echo getfperm(expand("~/.config/nvim/init.vim"))
--- <This will hopefully (from a security point of view) display
--- the string "rw-r--r--" or even "rw-------".
---
--- For setting permissions use |setfperm()|.
---
--- @param fname string
--- @return string
function vim.fn.getfperm(fname) end

--- Returns the size in bytes of the given file {fname}.
--- If {fname} is a directory, 0 is returned.
--- If the file {fname} can't be found, -1 is returned.
--- If the size of {fname} is too big to fit in a Number then -2
--- is returned.
---
--- @param fname string
--- @return integer
function vim.fn.getfsize(fname) end

--- Returns the last modification time ("mtime") of file {fname}.
--- The value is measured as seconds since 1st Jan 1970, and may
--- be passed to |strftime()|.  See also
--- |localtime()| and |strftime()|.
--- If the file {fname} can't be found -1 is returned.
---
--- @param fname string
--- @return integer
function vim.fn.getftime(fname) end

--- Returns a description of the type of file {fname} as a
--- String.  If {fname} does not exist an empty string is
--- returned.
--- Here is a table over different kinds of files and their
--- results:
---   Normal file    "file"
---   Directory    "dir"
---   Symbolic link    "link"
---   Block device    "bdev"
---   Character device  "cdev"
---   Socket      "socket"
---   FIFO      "fifo"
---   All other    "other"
--- Example: >vim
---   getftype("/home")
--- <Note that a type such as "link" will only be returned on
--- systems that support it.  On some systems only "dir" and
--- "file" are returned.
---
--- @param fname string
--- @return 'file'|'dir'|'link'|'bdev'|'cdev'|'socket'|'fifo'|'other'
function vim.fn.getftype(fname) end

--- Returns the |jumplist| for the specified window.
---
--- Without arguments use the current window.
--- With {winnr} only use this window in the current tab page.
--- {winnr} can also be a |window-ID|.
--- With {winnr} and {tabnr} use the window in the specified tab
--- page.   If {winnr} or {tabnr} is invalid, an empty list is
--- returned.
---
--- The returned list contains two entries: a list with the jump
--- locations and the last used jump position number in the list.
--- Each entry in the jump location list is a dictionary with
--- the following entries:
---   bufnr    buffer number
---   col    column number
---   coladd    column offset for 'virtualedit'
---   filename  filename if available
---   lnum    line number
---
--- @param winnr? integer
--- @param tabnr? integer
--- @return vim.fn.getjumplist.ret
function vim.fn.getjumplist(winnr, tabnr) end

--- Without {end} the result is a String, which is line {lnum}
--- from the current buffer.  Example: >vim
---   getline(1)
--- <When {lnum} is a String that doesn't start with a
--- digit, |line()| is called to translate the String into a Number.
--- To get the line under the cursor: >vim
---   getline(".")
--- <When {lnum} is a number smaller than 1 or bigger than the
--- number of lines in the buffer, an empty string is returned.
---
--- When {end} is given the result is a |List| where each item is
--- a line from the current buffer in the range {lnum} to {end},
--- including line {end}.
--- {end} is used in the same way as {lnum}.
--- Non-existing lines are silently omitted.
--- When {end} is before {lnum} an empty |List| is returned.
--- Example: >vim
---   let start = line('.')
---   let end = search("^$") - 1
---   let lines = getline(start, end)
---
--- <To get lines from another buffer see |getbufline()| and
--- |getbufoneline()|
---
--- @param lnum integer|string
--- @param end_? nil|false
--- @return string
function vim.fn.getline(lnum, end_) end

--- @param lnum integer|string
--- @param end_ true|number|string|table
--- @return string|string[]
function vim.fn.getline(lnum, end_) end

--- Returns a |List| with all the entries in the location list for
--- window {nr}.  {nr} can be the window number or the |window-ID|.
--- When {nr} is zero the current window is used.
---
--- For a location list window, the displayed location list is
--- returned.  For an invalid window number {nr}, an empty list is
--- returned.  Otherwise, same as |getqflist()|.
---
--- If the optional {what} dictionary argument is supplied, then
--- returns the items listed in {what} as a dictionary.  Refer to
--- |getqflist()| for the supported items in {what}.
---
--- In addition to the items supported by |getqflist()| in {what},
--- the following item is supported by |getloclist()|:
---
---   filewinid  id of the window used to display files
---       from the location list.  This field is
---       applicable only when called from a
---       location list window.  See
---       |location-list-file-window| for more
---       details.
---
--- Returns a |Dictionary| with default values if there is no
--- location list for the window {nr}.
--- Returns an empty Dictionary if window {nr} does not exist.
---
--- Examples (See also |getqflist-examples|): >vim
---   echo getloclist(3, {'all': 0})
---   echo getloclist(5, {'filewinid': 0})
--- <
---
--- @param nr integer
--- @param what? table
--- @return any
function vim.fn.getloclist(nr, what) end

--- Without the {buf} argument returns a |List| with information
--- about all the global marks. |mark|
---
--- If the optional {buf} argument is specified, returns the
--- local marks defined in buffer {buf}.  For the use of {buf},
--- see |bufname()|.  If {buf} is invalid, an empty list is
--- returned.
---
--- Each item in the returned List is a |Dict| with the following:
---     mark   name of the mark prefixed by "'"
---     pos     a |List| with the position of the mark:
---     [bufnum, lnum, col, off]
---      Refer to |getpos()| for more information.
---     file   file name
---
--- Refer to |getpos()| for getting information about a specific
--- mark.
---
--- @param buf? integer?
--- @return vim.fn.getmarklist.ret.item[]
function vim.fn.getmarklist(buf) end

--- Returns a |List| with all matches previously defined for the
--- current window by |matchadd()| and the |:match| commands.
--- |getmatches()| is useful in combination with |setmatches()|,
--- as |setmatches()| can restore a list of matches saved by
--- |getmatches()|.
--- If {win} is specified, use the window with this number or
--- window ID instead of the current window.  If {win} is invalid,
--- an empty list is returned.
--- Example: >vim
---   echo getmatches()
--- < >
---   [{"group": "MyGroup1", "pattern": "TODO",
---   "priority": 10, "id": 1}, {"group": "MyGroup2",
---   "pattern": "FIXME", "priority": 10, "id": 2}]
--- < >vim
---   let m = getmatches()
---   call clearmatches()
---   echo getmatches()
--- < >
---   []
--- < >vim
---   call setmatches(m)
---   echo getmatches()
--- < >
---   [{"group": "MyGroup1", "pattern": "TODO",
---   "priority": 10, "id": 1}, {"group": "MyGroup2",
---   "pattern": "FIXME", "priority": 10, "id": 2}]
--- < >vim
---   unlet m
--- <
---
--- @param win? integer
--- @return vim.fn.getmatches.ret.item[]
function vim.fn.getmatches(win) end

--- Returns a |Dictionary| with the last known position of the
--- mouse.  This can be used in a mapping for a mouse click.  The
--- items are:
---   screenrow  screen row
---   screencol  screen column
---   winid    Window ID of the click
---   winrow    row inside "winid"
---   wincol    column inside "winid"
---   line    text line inside "winid"
---   column    text column inside "winid"
---   coladd    offset (in screen columns) from the
---       start of the clicked char
--- All numbers are 1-based.
---
--- If not over a window, e.g. when in the command line, then only
--- "screenrow" and "screencol" are valid, the others are zero.
---
--- When on the status line below a window or the vertical
--- separator right of a window, the "line" and "column" values
--- are zero.
---
--- When the position is after the text then "column" is the
--- length of the text in bytes plus one.
---
--- If the mouse is over a focusable floating window then that
--- window is used.
---
--- When using |getchar()| the Vim variables |v:mouse_lnum|,
--- |v:mouse_col| and |v:mouse_winid| also provide these values.
---
--- @return vim.fn.getmousepos.ret
function vim.fn.getmousepos() end

--- Return a Number which is the process ID of the Vim process.
--- This is a unique number, until Vim exits.
---
--- @return integer
function vim.fn.getpid() end

--- Gets a position, where {expr} is one of:
---     .      Cursor position.
---     $      Last line in the current buffer.
---     'x      Position of mark x (if the mark is not set, 0 is
---       returned for all values).
---     w0      First line visible in current window (one if the
---       display isn't updated, e.g. in silent Ex mode).
---     w$      Last line visible in current window (this is one
---       less than "w0" if no lines are visible).
---     v      End of the current Visual selection (unlike |'<|
---       |'>| which give the previous, not current, Visual
---       selection), or the cursor position if not in Visual
---       mode.
---
---       To get the current selected region: >vim
---         let region = getregionpos(getpos('v'), getpos('.'))
--- <
---       Explanation: in Visual mode "v" and "." complement each
---       other.  While "." refers to the cursor position, "v"
---       refers to where |v_o| would move the cursor.  So you can
---       use "v" and "." together to get the selected region.
---
--- Note that if a mark in another file is used, the line number
--- applies to that buffer.
---
--- The result is a |List| with four numbers:
---     [bufnum, lnum, col, off]
--- "bufnum" is zero, unless a mark like '0 or 'A is used, then it
--- is the buffer number of the mark.
--- "lnum" and "col" are the position in the buffer.  The first
--- column is 1.
--- The "off" number is zero, unless 'virtualedit' is used.  Then
--- it is the offset in screen columns from the start of the
--- character.  E.g., a position within a <Tab> or after the last
--- character.
---
--- For getting the cursor position see |getcurpos()|.
--- The column number in the returned List is the byte position
--- within the line.  To get the character position in the line,
--- use |getcharpos()|.
---
--- The visual marks |'<| and |'>| refer to the beginning and end
--- of the visual selection relative to the buffer.  Note that
--- this differs from |setpos()|, where they are relative to the
--- cursor position.
---
--- Note that for '< and '> Visual mode matters: when it is "V"
--- (visual line mode) the column of '< is zero and the column of
--- '> is a large number equal to |v:maxcol|.
--- A very large column number equal to |v:maxcol| can be returned,
--- in which case it means "after the end of the line".
--- If {expr} is invalid, returns a list with all zeros.
---
--- This can be used to save and restore the position of a mark: >vim
---   let save_a_mark = getpos("'a")
---   " ...
---   call setpos("'a", save_a_mark)
--- <
--- Also see |getcharpos()|, |getcurpos()| and |setpos()|.
---
--- @param expr string
--- @return [integer, integer, integer, integer]
function vim.fn.getpos(expr) end

--- Returns a |List| with all the current quickfix errors.  Each
--- list item is a dictionary with these entries:
---   bufnr  number of buffer that has the file name, use
---     |bufname()| to get the name
---   module  module name
---   lnum  line number in the buffer (first line is 1)
---   end_lnum
---     end of line number if the item is multiline
---   col  column number (first column is 1)
---   end_col  end of column number if the item has range
---   vcol  |TRUE|: "col" is visual column
---     |FALSE|: "col" is byte index
---   nr  error number
---   pattern  search pattern used to locate the error
---   text  description of the error
---   type  type of the error, 'E', '1', etc.
---   valid  |TRUE|: recognized error message
---   user_data
---     custom data associated with the item, can be
---     any type.
---
--- When there is no error list or it's empty, an empty list is
--- returned.  Quickfix list entries with a non-existing buffer
--- number are returned with "bufnr" set to zero (Note: some
--- functions accept buffer number zero for the alternate buffer,
--- you may need to explicitly check for zero).
---
--- Useful application: Find pattern matches in multiple files and
--- do something with them: >vim
---   vimgrep /theword/jg *.c
---   for d in getqflist()
---      echo bufname(d.bufnr) ':' d.lnum '=' d.text
---   endfor
--- <
--- If the optional {what} dictionary argument is supplied, then
--- returns only the items listed in {what} as a dictionary.  The
--- following string items are supported in {what}:
---   changedtick  get the total number of changes made
---       to the list |quickfix-changedtick|
---   context  get the |quickfix-context|
---   efm  errorformat to use when parsing "lines".  If
---     not present, then the 'errorformat' option
---     value is used.
---   id  get information for the quickfix list with
---     |quickfix-ID|; zero means the id for the
---     current list or the list specified by "nr"
---   idx  get information for the quickfix entry at this
---     index in the list specified by "id" or "nr".
---     If set to zero, then uses the current entry.
---     See |quickfix-index|
---   items  quickfix list entries
---   lines  parse a list of lines using 'efm' and return
---     the resulting entries.  Only a |List| type is
---     accepted.  The current quickfix list is not
---     modified.  See |quickfix-parse|.
---   nr  get information for this quickfix list; zero
---     means the current quickfix list and "$" means
---     the last quickfix list
---   qfbufnr number of the buffer displayed in the quickfix
---     window.  Returns 0 if the quickfix buffer is
---     not present.  See |quickfix-buffer|.
---   size  number of entries in the quickfix list
---   title  get the list title |quickfix-title|
---   winid  get the quickfix |window-ID|
---   all  all of the above quickfix properties
--- Non-string items in {what} are ignored.  To get the value of a
--- particular item, set it to zero.
--- If "nr" is not present then the current quickfix list is used.
--- If both "nr" and a non-zero "id" are specified, then the list
--- specified by "id" is used.
--- To get the number of lists in the quickfix stack, set "nr" to
--- "$" in {what}.  The "nr" value in the returned dictionary
--- contains the quickfix stack size.
--- When "lines" is specified, all the other items except "efm"
--- are ignored.  The returned dictionary contains the entry
--- "items" with the list of entries.
---
--- The returned dictionary contains the following entries:
---   changedtick  total number of changes made to the
---       list |quickfix-changedtick|
---   context  quickfix list context.  See |quickfix-context|
---     If not present, set to "".
---   id  quickfix list ID |quickfix-ID|.  If not
---     present, set to 0.
---   idx  index of the quickfix entry in the list.  If
---     not present, set to 0.
---   items  quickfix list entries.  If not present, set to
---     an empty list.
---   nr  quickfix list number.  If not present, set to
---     0
---   qfbufnr  number of the buffer displayed in the quickfix
---     window.  If not present, set to 0.
---   size  number of entries in the quickfix list.  If
---     not present, set to 0.
---   title  quickfix list title text.  If not present, set
---     to "".
---   winid  quickfix |window-ID|.  If not present, set to 0
---
--- Examples (See also |getqflist-examples|): >vim
---   echo getqflist({'all': 1})
---   echo getqflist({'nr': 2, 'title': 1})
---   echo getqflist({'lines' : ["F1:10:L10"]})
--- <
---
--- @param what? table
--- @return any
function vim.fn.getqflist(what) end

--- Returns the contents of register {regname} as a String.
--- Example: >vim
---   let cliptext = getreg('*')
--- <When register {regname} was not set the result is an empty
--- string.
--- The {regname} argument must be a string.
---
--- getreg('=') returns the last evaluated value of the expression
--- register.  (For use in maps.)
--- getreg('=', 1) returns the expression itself, so that it can
--- be restored with |setreg()|.  For other registers the extra
--- argument is ignored, thus you can always give it.
---
--- If {list} is present and |TRUE|, the result type is changed
--- to |List|.  Each list item is one text line.  Use it if you care
--- about zero bytes possibly present inside register: without
--- third argument both NLs and zero bytes are represented as NLs
--- (see |NL-used-for-Nul|).
--- When the register was not set an empty list is returned.
---
--- If {regname} is not specified, |v:register| is used.
---
--- @param regname? string
--- @param expr? any
--- @param list? nil|false
--- @return string
function vim.fn.getreg(regname, expr, list) end

--- @param regname string
--- @param expr any
--- @param list true|number|string|table
--- @return string[]
function vim.fn.getreg(regname, expr, list) end

--- Returns detailed information about register {regname} as a
--- Dictionary with the following entries:
---   regcontents  List of lines contained in register
---       {regname}, like
---       getreg({regname}, 1, 1).
---   regtype    the type of register {regname}, as in
---       |getregtype()|.
---   isunnamed  Boolean flag, v:true if this register
---       is currently pointed to by the unnamed
---       register.
---   points_to  for the unnamed register, gives the
---       single letter name of the register
---       currently pointed to (see |quotequote|).
---       For example, after deleting a line
---       with `dd`, this field will be "1",
---       which is the register that got the
---       deleted text.
---
--- The {regname} argument is a string.  If {regname} is invalid
--- or not set, an empty Dictionary will be returned.
--- If {regname} is not specified, |v:register| is used.
--- The returned Dictionary can be passed to |setreg()|.
---
--- @param regname? string
--- @return table
function vim.fn.getreginfo(regname) end

--- Returns the list of strings from {pos1} to {pos2} from a
--- buffer.
---
--- {pos1} and {pos2} must both be |List|s with four numbers.
--- See |getpos()| for the format of the list.  It's possible
--- to specify positions from a different buffer, but please
--- note the limitations at |getregion-notes|.
---
--- The optional argument {opts} is a Dict and supports the
--- following items:
---
---   type    Specify the region's selection type.
---       See |getregtype()| for possible values,
---       except that the width can be omitted
---       and an empty string cannot be used.
---       (default: "v")
---
---   exclusive  If |TRUE|, use exclusive selection
---       for the end position.
---       (default: follow 'selection')
---
--- You can get the last selection type by |visualmode()|.
--- If Visual mode is active, use |mode()| to get the Visual mode
--- (e.g., in a |:vmap|).
--- This function is useful to get text starting and ending in
--- different columns, such as a |charwise-visual| selection.
---
---           *getregion-notes*
--- Note that:
--- - Order of {pos1} and {pos2} doesn't matter, it will always
---   return content from the upper left position to the lower
---   right position.
--- - If 'virtualedit' is enabled and the region is past the end
---   of the lines, resulting lines are padded with spaces.
--- - If the region is blockwise and it starts or ends in the
---   middle of a multi-cell character, it is not included but
---   its selected part is substituted with spaces.
--- - If {pos1} and {pos2} are not in the same buffer, an empty
---   list is returned.
--- - {pos1} and {pos2} must belong to a |bufloaded()| buffer.
--- - It is evaluated in current window context, which makes a
---   difference if the buffer is displayed in a window with
---   different 'virtualedit' or 'list' values.
--- - When specifying an exclusive selection and {pos1} and {pos2}
---   are equal, the returned list contains a single character as
---   if selection is inclusive, to match the behavior of an empty
---   exclusive selection in Visual mode.
---
--- Examples: >vim
---   xnoremap <CR>
---   \ <Cmd>echom getregion(
---   \ getpos('v'), getpos('.'), #{ type: mode() })<CR>
--- <
---
--- @param pos1 [integer, integer, integer, integer]
--- @param pos2 [integer, integer, integer, integer]
--- @param opts? {type?:string, exclusive?:boolean}
--- @return string[]
function vim.fn.getregion(pos1, pos2, opts) end

--- Same as |getregion()|, but returns a list of positions
--- describing the buffer text segments bound by {pos1} and
--- {pos2}.
--- The segments are a pair of positions for every line: >
---   [[{start_pos}, {end_pos}], ...]
--- <
--- The position is a |List| with four numbers:
---     [bufnum, lnum, col, off]
--- "bufnum" is the buffer number.
--- "lnum" and "col" are the position in the buffer.  The first
--- column is 1.
--- If the "off" number of a starting position is non-zero, it is
--- the offset in screen columns from the start of the character.
--- E.g., a position within a <Tab> or after the last character.
--- If the "off" number of an ending position is non-zero, it is
--- the offset of the character's first cell not included in the
--- selection, otherwise all its cells are included.
---
--- To get the current visual selection: >vim
---   let region = getregionpos(getpos('v'), getpos('.'))
--- <
--- The {opts} Dict supports the following items:
---
---   type    See |getregion()|.
---
---   exclusive  See |getregion()|.
---
---   eol    If |TRUE|, indicate positions beyond
---       the end of a line with "col" values
---       one more than the length of the line.
---       If |FALSE|, positions are limited
---       within their lines, and if a line is
---       empty or the selection is entirely
---       beyond the end of a line, a "col"
---       value of 0 is used for both positions.
---       (default: |FALSE|)
---
--- @param pos1 [integer, integer, integer, integer]
--- @param pos2 [integer, integer, integer, integer]
--- @param opts? {type?:string, exclusive?:boolean, eol?:boolean}
--- @return [ [integer, integer, integer, integer], [integer, integer, integer, integer] ][]
function vim.fn.getregionpos(pos1, pos2, opts) end

--- Returns the type of register {regname} as a String.
--- The value will be one of:
---     "v"      for |charwise| text
---     "V"      for |linewise| text
---     "<CTRL-V>{width}"  for |blockwise-visual| text
---     ""      for an empty or unknown register
--- <CTRL-V> is one character with value 0x16.
--- The {regname} argument is a string.  If {regname} is not
--- specified, |v:register| is used.
---
--- @param regname? string
--- @return string
function vim.fn.getregtype(regname) end

--- Returns a |List| with information about all the sourced Vim
--- scripts in the order they were sourced, like what
--- `:scriptnames` shows.
---
--- The optional Dict argument {opts} supports the following
--- optional items:
---     name  Script name match pattern.  If specified,
---     and "sid" is not specified, information about
---     scripts with a name that match the pattern
---     "name" are returned.
---     sid    Script ID |<SID>|.  If specified, only
---     information about the script with ID "sid" is
---     returned and "name" is ignored.
---
--- Each item in the returned List is a |Dict| with the following
--- items:
---     autoload  Always set to FALSE.
---     functions   List of script-local function names defined in
---     the script.  Present only when a particular
---     script is specified using the "sid" item in
---     {opts}.
---     name  Vim script file name.
---     sid    Script ID |<SID>|.
---     variables   A dictionary with the script-local variables.
---     Present only when a particular script is
---     specified using the "sid" item in {opts}.
---     Note that this is a copy, the value of
---     script-local variables cannot be changed using
---     this dictionary.
---     version  Vim script version, always 1
---
--- Examples: >vim
---   echo getscriptinfo({'name': 'myscript'})
---   echo getscriptinfo({'sid': 15})[0].variables
--- <
---
--- @param opts? table
--- @return vim.fn.getscriptinfo.ret[]
function vim.fn.getscriptinfo(opts) end

--- Returns the current stack trace of Vim scripts.
--- Stack trace is a |List|, of which each item is a |Dictionary|
--- with the following items:
---     funcref  The funcref if the stack is at a function,
---     otherwise this item is omitted.
---     event  The string of the event description if the
---     stack is at an autocmd event, otherwise this
---     item is omitted.
---     lnum  The line number in the script on the stack.
---     filepath  The file path of the script on the stack.
---
--- @return table[]
function vim.fn.getstacktrace() end

--- If {tabnr} is not specified, then information about all the
--- tab pages is returned as a |List|.  Each List item is a
--- |Dictionary|.  Otherwise, {tabnr} specifies the tab page
--- number and information about that one is returned.  If the tab
--- page does not exist an empty List is returned.
---
--- Each List item is a |Dictionary| with the following entries:
---   tabnr    tab page number.
---   variables  a reference to the dictionary with
---       tabpage-local variables
---   windows    List of |window-ID|s in the tab page.
---
--- @param tabnr? integer
--- @return any
function vim.fn.gettabinfo(tabnr) end

--- Get the value of a tab-local variable {varname} in tab page
--- {tabnr}. |t:var|
--- Tabs are numbered starting with one.
--- The {varname} argument is a string.  When {varname} is empty a
--- dictionary with all tab-local variables is returned.
--- Note that the name without "t:" must be used.
--- When the tab or variable doesn't exist {def} or an empty
--- string is returned, there is no error message.
---
--- @param tabnr integer
--- @param varname string
--- @param def? any
--- @return any
function vim.fn.gettabvar(tabnr, varname, def) end

--- Get the value of window-local variable {varname} in window
--- {winnr} in tab page {tabnr}.
--- The {varname} argument is a string.  When {varname} is empty a
--- dictionary with all window-local variables is returned.
--- When {varname} is equal to "&" get the values of all
--- window-local options in a |Dictionary|.
--- Otherwise, when {varname} starts with "&" get the value of a
--- window-local option.
--- Note that {varname} must be the name without "w:".
--- Tabs are numbered starting with one.  For the current tabpage
--- use |getwinvar()|.
--- {winnr} can be the window number or the |window-ID|.
--- When {winnr} is zero the current window is used.
--- This also works for a global option, buffer-local option and
--- window-local option, but it doesn't work for a global variable
--- or buffer-local variable.
--- When the tab, window or variable doesn't exist {def} or an
--- empty string is returned, there is no error message.
--- Examples: >vim
---   let list_is_on = gettabwinvar(1, 2, '&list')
---   echo "myvar = " .. gettabwinvar(3, 1, 'myvar')
--- <
--- To obtain all window-local variables use: >vim
---   gettabwinvar({tabnr}, {winnr}, '&')
--- <
---
--- @param tabnr integer
--- @param winnr integer
--- @param varname string
--- @param def? any
--- @return any
function vim.fn.gettabwinvar(tabnr, winnr, varname, def) end

--- Returns the tag stack of window {winnr} as a Dict.
--- {winnr} can be the window number or the |window-ID|.
--- When {winnr} is not specified, the current window is used.
--- When window {winnr} doesn't exist, an empty Dict is returned.
---
--- The returned dictionary contains the following entries:
---   curidx    Current index in the stack.  When at
---       top of the stack, set to (length + 1).
---       Index of bottom of the stack is 1.
---   items    List of items in the stack.  Each item
---       is a dictionary containing the
---       entries described below.
---   length    Number of entries in the stack.
---
--- Each item in the stack is a dictionary with the following
--- entries:
---   bufnr    buffer number of the current jump
---   from    cursor position before the tag jump.
---       See |getpos()| for the format of the
---       returned list.
---   matchnr    current matching tag number.  Used
---       when multiple matching tags are found
---       for a name.
---   tagname    name of the tag
---
--- See |tagstack| for more information about the tag stack.
---
--- @param winnr? integer
--- @return any
function vim.fn.gettagstack(winnr) end

--- Translate String {text} if possible.
--- This is mainly for use in the distributed Vim scripts.  When
--- generating message translations the {text} is extracted by
--- xgettext, the translator can add the translated message in the
--- .po file and Vim will lookup the translation when gettext() is
--- called.
--- For {text} double quoted strings are preferred, because
--- xgettext does not understand escaping in single quoted
--- strings.
---
--- @param text string
--- @return string
function vim.fn.gettext(text) end

--- Returns information about windows as a |List| with Dictionaries.
---
--- If {winid} is given Information about the window with that ID
--- is returned, as a |List| with one item.  If the window does not
--- exist the result is an empty list.
---
--- Without {winid} information about all the windows in all the
--- tab pages is returned.
---
--- Each List item is a |Dictionary| with the following entries:
---   botline    last complete displayed buffer line
---   bufnr    number of buffer in the window
---   height    window height (excluding winbar)
---   leftcol    first column displayed; only used when
---       'wrap' is off
---   loclist    1 if showing a location list
---   quickfix  1 if quickfix or location list window
---   status_height  status lines height (0 or 1)
---   tabnr    tab page number
---   terminal  1 if a terminal window
---   textoff    number of columns occupied by any
---       'foldcolumn', 'signcolumn' and line
---       number in front of the text
---   topline    first displayed buffer line
---   variables  a reference to the dictionary with
---       window-local variables
---   width    window width
---   winbar    1 if the window has a toolbar, 0
---       otherwise
---   wincol    leftmost screen column of the window;
---       "col" from |win_screenpos()|
---   winid    |window-ID|
---   winnr    window number
---   winrow    topmost screen line of the window;
---       "row" from |win_screenpos()|
---
--- @param winid? integer
--- @return vim.fn.getwininfo.ret.item[]
function vim.fn.getwininfo(winid) end

--- Returns the [x, y] screen position of the Nvim GUI window as
--- a |List| with two numbers (result of |getwinposx()| and
--- |getwinposy()| combined).
---
--- {timeout} can be used to specify how long to wait in msec for
--- a response.  When omitted 100 msec is used.
---
--- Use a longer time for a remote terminal.
--- When using a value less than 10 and no response is received
--- within that time, a previously reported position is returned,
--- if available.  This can be used to poll for the position and
--- do some work in the meantime: >vim
---   while 1
---     let res = getwinpos(1)
---     if res[0] >= 0
---       break
---     endif
---     " Do some work here
---   endwhile
--- <
---
--- @param timeout? integer
--- @return any
function vim.fn.getwinpos(timeout) end

--- Returns the X coordinate in pixels of the left hand side of
--- the Nvim GUI window, or -1 if not available. The value can be
--- used with `:winpos`.
---
--- @return integer
function vim.fn.getwinposx() end

--- Returns the Y coordinate in pixels of the top of the Nvim GUI
--- window, or -1 if not available. The value can be used with
--- `:winpos`.
---
--- @return integer
function vim.fn.getwinposy() end

--- Like |gettabwinvar()| for the current tabpage.
--- Examples: >vim
---   let list_is_on = getwinvar(2, '&list')
---   echo "myvar = " .. getwinvar(1, 'myvar')
--- <
---
--- @param winnr integer
--- @param varname string
--- @param def? any
--- @return any
function vim.fn.getwinvar(winnr, varname, def) end

--- Expand the file wildcards in {expr}.  See |wildcards| for the
--- use of special characters.
---
--- Unless the optional {nosuf} argument is given and is |TRUE|,
--- the 'suffixes' and 'wildignore' options apply: Names matching
--- one of the patterns in 'wildignore' will be skipped and
--- 'suffixes' affect the ordering of matches.
--- 'wildignorecase' always applies.
---
--- When {list} is present and it is |TRUE| the result is a |List|
--- with all matching files.  The advantage of using a List is,
--- you also get filenames containing newlines correctly.
--- Otherwise the result is a String and when there are several
--- matches, they are separated by <NL> characters.
---
--- If the expansion fails, the result is an empty String or List.
---
--- You can also use |readdir()| if you need to do complicated
--- things, such as limiting the number of matches.
---
--- A name for a non-existing file is not included.  A symbolic
--- link is only included if it points to an existing file.
--- However, when the {alllinks} argument is present and it is
--- |TRUE| then all symbolic links are included.
---
--- For most systems backticks can be used to get files names from
--- any external command.  Example: >vim
---   let tagfiles = glob("`find . -name tags -print`")
---   let &tags = substitute(tagfiles, "\n", ",", "g")
--- <The result of the program inside the backticks should be one
--- item per line.  Spaces inside an item are allowed.
---
--- See |expand()| for expanding special Vim variables.  See
--- |system()| for getting the raw output of an external command.
---
--- @param expr string
--- @param nosuf? boolean
--- @param list? boolean
--- @param alllinks? boolean
--- @return any
function vim.fn.glob(expr, nosuf, list, alllinks) end

--- Convert a file pattern, as used by |glob()|, into a search
--- pattern.  The result can be used to match with a string that
--- is a file name.  E.g. >vim
---   if filename =~ glob2regpat('Make*.mak')
---     " ...
---   endif
--- <This is equivalent to: >vim
---   if filename =~ '^Make.*\.mak$'
---     " ...
---   endif
--- <When {string} is an empty string the result is "^$", match an
--- empty string.
--- Note that the result depends on the system.  On MS-Windows
--- a backslash usually means a path separator.
---
--- @param string string
--- @return string
function vim.fn.glob2regpat(string) end

--- Perform |glob()| for String {expr} on all directories in {path}
--- and concatenate the results.  Example: >vim
---   echo globpath(&rtp, "syntax/c.vim")
--- <
--- {path} is a comma-separated list of directory names.  Each
--- directory name is prepended to {expr} and expanded like with
--- |glob()|.  A path separator is inserted when needed.
--- To add a comma inside a directory name escape it with a
--- backslash.  Note that on MS-Windows a directory may have a
--- trailing backslash, remove it if you put a comma after it.
--- If the expansion fails for one of the directories, there is no
--- error message.
---
--- Unless the optional {nosuf} argument is given and is |TRUE|,
--- the 'suffixes' and 'wildignore' options apply: Names matching
--- one of the patterns in 'wildignore' will be skipped and
--- 'suffixes' affect the ordering of matches.
---
--- When {list} is present and it is |TRUE| the result is a |List|
--- with all matching files.  The advantage of using a List is,
--- you also get filenames containing newlines correctly.
--- Otherwise the result is a String and when there are several
--- matches, they are separated by <NL> characters.  Example: >vim
---   echo globpath(&rtp, "syntax/c.vim", 0, 1)
--- <
--- {allinks} is used as with |glob()|.
---
--- The "**" item can be used to search in a directory tree.
--- For example, to find all "README.txt" files in the directories
--- in 'runtimepath' and below: >vim
---   echo globpath(&rtp, "**/README.txt")
--- <Upwards search and limiting the depth of "**" is not
--- supported, thus using 'path' will not always work properly.
---
--- @param path string
--- @param expr string
--- @param nosuf? boolean
--- @param list? boolean
--- @param allinks? boolean
--- @return any
function vim.fn.globpath(path, expr, nosuf, list, allinks) end

--- Returns 1 if {feature} is supported, 0 otherwise.  The
--- {feature} argument is a feature name like "nvim-0.2.1" or
--- "win32", see below.  See also |exists()|.
---
--- To get the system name use |vim.uv|.os_uname() in Lua: >lua
---   print(vim.uv.os_uname().sysname)
---
--- <If the code has a syntax error then Vimscript may skip the
--- rest of the line.  Put |:if| and |:endif| on separate lines to
--- avoid the syntax error: >vim
---   if has('feature')
---     let x = this_breaks_without_the_feature()
---   endif
--- <
--- Vim's compile-time feature-names (prefixed with "+") are not
--- recognized because Nvim is always compiled with all possible
--- features. |feature-compile|
---
--- Feature names can be:
--- 1.  Nvim version. For example the "nvim-0.2.1" feature means
---     that Nvim is version 0.2.1 or later: >vim
---   if has("nvim-0.2.1")
---     " ...
---   endif
---
--- <2.  Runtime condition or other pseudo-feature. For example the
---     "win32" feature checks if the current system is Windows: >vim
---   if has("win32")
---     " ...
---   endif
--- <          *feature-list*
---     List of supported pseudo-feature names:
---   acl    |ACL| support.
---   *android*  Android system (not necessarily |termux|).
---   bsd    BSD system (not macOS, use "mac" for that).
---   clipboard  |clipboard| provider is available.
---   fname_case  Case in file names matters (for Darwin and MS-Windows
---       this is not present).
---   gui_running  Nvim has a GUI.
---   hurd    GNU/Hurd system.
---   iconv    Can use |iconv()| for conversion.
---   linux    Linux system.
---   mac    MacOS system.
---   nvim    This is Nvim.
---   python3    Legacy Vim |python3| interface. |has-python|
---   pythonx    Legacy Vim |python_x| interface. |has-pythonx|
---   sun    SunOS system.
---   *termux*  Termux, an |android| terminal app and packaging environment.
---   ttyin    input is a terminal (tty).
---   ttyout    output is a terminal (tty).
---   unix    Unix system.
---   *vim_starting*  True during |startup|.
---   win32    Windows system (32 or 64 bit).
---   win64    Windows system (64 bit).
---   wsl    WSL (Windows Subsystem for Linux) system.
---
---           *has-patch*
--- 3.  Vim patch. For example the "patch123" feature means that
---     Vim patch 123 at the current |v:version| was included: >vim
---   if v:version > 602 || v:version == 602 && has("patch148")
---     " ...
---   endif
---
--- <4.  Vim version. For example the "patch-7.4.237" feature means
---     that Nvim is Vim-compatible to version 7.4.237 or later. >vim
---   if has("patch-7.4.237")
---     " ...
---   endif
--- <
---
--- @param feature string
--- @return 0|1
function vim.fn.has(feature) end

--- Checks whether |Dictionary| {dict} has an entry with key
--- {key}.  Returns TRUE if so, FALSE otherwise.  The {key}
--- argument is a string.
---
--- @param dict table
--- @param key string
--- @return 0|1
function vim.fn.has_key(dict, key) end

--- Checks whether the window or tabpage has set a local working
--- directory.  Returns 1 when the window has set a local path
--- via |:lcd| or when {winnr} is -1 and the tabpage has set a
--- local path via |:tcd|, otherwise 0.
---
--- Tabs and windows are identified by their respective numbers,
--- 0 means current tab or window. Missing argument implies 0.
--- Thus the following are equivalent: >vim
---   echo haslocaldir()
---   echo haslocaldir(0)
---   echo haslocaldir(0, 0)
--- <With {winnr} use that window in the current tabpage.
--- With {winnr} and {tabnr} use the window in that tabpage.
--- {winnr} can be the window number or the |window-ID|.
--- If {winnr} is -1 it is ignored, only the tab is resolved.
--- Throw error if the arguments are invalid. |E5000| |E5001| |E5002|
---
--- @param winnr? integer
--- @param tabnr? integer
--- @return 0|1
function vim.fn.haslocaldir(winnr, tabnr) end

--- Checks whether a mapping exists whose rhs contains {what}.
--- Returns TRUE if there is such a mapping in one of the modes
--- indicated by {mode}.
--- The arguments {what} and {mode} are strings.
--- When {abbr} is there and it is |TRUE| use abbreviations
--- instead of mappings.  Don't forget to specify Insert and/or
--- Command-line mode.
--- Both the global mappings and the mappings local to the current
--- buffer are checked for a match.
--- If no matching mapping is found FALSE is returned.
--- The following characters are recognized in {mode}:
---   n  Normal mode
---   v  Visual and Select mode
---   x  Visual mode
---   s  Select mode
---   o  Operator-pending mode
---   i  Insert mode
---   l  Language-Argument ("r", "f", "t", etc.)
---   c  Command-line mode
--- When {mode} is omitted, "nvo" is used.
---
--- This function is useful to check if a mapping already exists
--- to a function in a Vim script.  Example: >vim
---   if !hasmapto('\ABCdoit')
---      map <Leader>d \ABCdoit
---   endif
--- <This installs the mapping to "\ABCdoit" only if there isn't
--- already a mapping to "\ABCdoit".
---
--- @param what any
--- @param mode? string
--- @param abbr? boolean
--- @return 0|1
function vim.fn.hasmapto(what, mode, abbr) end

--- @deprecated
--- Obsolete name for |hlID()|.
---
--- @param name string
--- @return any
function vim.fn.highlightID(name) end

--- @deprecated
--- Obsolete name for |hlexists()|.
---
--- @param name string
--- @return any
function vim.fn.highlight_exists(name) end

--- Add the String {item} to the history {history} which can be
--- one of:          *hist-names*
---   "cmd"   or ":"    command line history
---   "search" or "/"   search pattern history
---   "expr"   or "="   typed expression history
---   "input"  or "\@"    input line history
---   "debug"  or ">"   debug command history
---   empty      the current or last used history
--- The {history} string does not need to be the whole name, one
--- character is sufficient.
--- If {item} does already exist in the history, it will be
--- shifted to become the newest entry.
--- The result is a Number: TRUE if the operation was successful,
--- otherwise FALSE is returned.
---
--- Example: >vim
---   call histadd("input", strftime("%Y %b %d"))
---   let date=input("Enter date: ")
--- <This function is not available in the |sandbox|.
---
--- @param history string
--- @param item any
--- @return 0|1
function vim.fn.histadd(history, item) end

--- Clear {history}, i.e. delete all its entries.  See |hist-names|
--- for the possible values of {history}.
---
--- If the parameter {item} evaluates to a String, it is used as a
--- regular expression.  All entries matching that expression will
--- be removed from the history (if there are any).
--- Upper/lowercase must match, unless "\c" is used |/\c|.
--- If {item} evaluates to a Number, it will be interpreted as
--- an index, see |:history-indexing|.  The respective entry will
--- be removed if it exists.
---
--- The result is TRUE for a successful operation, otherwise FALSE
--- is returned.
---
--- Examples:
--- Clear expression register history: >vim
---   call histdel("expr")
--- <
--- Remove all entries starting with "*" from the search history: >vim
---   call histdel("/", '^\*')
--- <
--- The following three are equivalent: >vim
---   call histdel("search", histnr("search"))
---   call histdel("search", -1)
---   call histdel("search", '^' .. histget("search", -1) .. '$')
--- <
--- To delete the last search pattern and use the last-but-one for
--- the "n" command and 'hlsearch': >vim
---   call histdel("search", -1)
---   let \@/ = histget("search", -1)
--- <
---
--- @param history string
--- @param item? any
--- @return 0|1
function vim.fn.histdel(history, item) end

--- Returns an entry from the specified command-line {history}.
--- See |hist-names| for the possible values of {history}, and
--- |:history-indexing| for {index}.  If there is
--- no such entry, an empty String is returned.  When {index} is
--- omitted, the most recent item from the history is used.
---
--- Examples:
--- Redo the second last search from history. >vim
---   execute '/' .. histget("search", -2)
---
--- <Define an Ex command ":H {num}" that supports re-execution of
--- the {num}th entry from the output of |:history|. >vim
---   command -nargs=1 H execute histget("cmd", 0+<args>)
--- <
---
--- @param history string
--- @param index? integer|string
--- @return string
function vim.fn.histget(history, index) end

--- The result is the Number of the current entry in {history}.
--- See |hist-names| for the possible values of {history}.
--- If an error occurred, -1 is returned.
---
--- Example: >vim
---   let inp_index = histnr("expr")
--- <
---
--- @param history string
--- @return integer
function vim.fn.histnr(history) end

--- Returns the numeric ID of the highlight group with name
--- {name}.  When the highlight group doesn't exist, zero is
--- returned.
--- This can be used to retrieve information about the highlight
--- group.  For example, to get the background color of the
--- "Comment" group: >vim
---   echo synIDattr(synIDtrans(hlID("Comment")), "bg")
--- <
---
--- @param name string
--- @return integer
function vim.fn.hlID(name) end

--- Checks whether a highlight group called {name} exists.
--- Returns TRUE if the group has been defined in some way.  Not
--- necessarily when highlighting has been defined for it, it may
--- also have been used for a syntax item.
---
--- @param name string
--- @return 0|1
function vim.fn.hlexists(name) end

--- Returns the hostname of the machine on which the Nvim server
--- (not the UI client) is currently running.
---
--- @return string
function vim.fn.hostname() end

--- Converts the encoding of {string} from {from} to {to}.
--- Returns the converted String.
--- When the conversion completely fails an empty string is
--- returned.  When some characters could not be converted they
--- are replaced with "?".
--- The encoding names are whatever the iconv() library function
--- can accept, see ":!man 3 iconv".
--- Note that Vim uses UTF-8 for all Unicode encodings, conversion
--- from/to UCS-2 is automatically changed to use UTF-8.  You
--- cannot use UCS-2 in a string anyway, because of the NUL bytes.
---
--- @param string string
--- @param from string
--- @param to string
--- @return string
function vim.fn.iconv(string, from, to) end

--- Returns a |String| which is a unique identifier of the
--- container type (|List|, |Dict|, |Blob| and |Partial|). It is
--- guaranteed that for the mentioned types `id(v1) ==# id(v2)`
--- returns true iff `type(v1) == type(v2) && v1 is v2`.
--- Note that `v:_null_string`, `v:_null_list`, `v:_null_dict` and
--- `v:_null_blob` have the same `id()` with different types
--- because they are internally represented as NULL pointers.
--- `id()` returns a hexadecimal representation of the pointers to
--- the containers (i.e. like `0x994a40`), same as `printf("%p",
--- {expr})`, but it is advised against counting on the exact
--- format of the return value.
---
--- It is not guaranteed that `id(no_longer_existing_container)`
--- will not be equal to some other `id()`: new containers may
--- reuse identifiers of the garbage-collected ones.
---
--- @param expr any
--- @return string
function vim.fn.id(expr) end

--- Returns the indent of line {lnum} in the current buffer.
--- The indent is counted in spaces, the value of 'tabstop' is
--- relevant.  {lnum} is used just like in
--- |getline()|.
--- When {lnum} is invalid -1 is returned.
---
--- To get or set indent of lines in a string, see |vim.text.indent()|.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.indent(lnum) end

--- Find {expr} in {object} and return its index.  See
--- |indexof()| for using a lambda to select the item.
---
--- If {object} is a |List| return the lowest index where the item
--- has a value equal to {expr}.  There is no automatic
--- conversion, so the String "4" is different from the Number 4.
--- And the Number 4 is different from the Float 4.0.  The value
--- of 'ignorecase' is not used here, case matters as indicated by
--- the {ic} argument.
---
--- If {object} is a |Blob| return the lowest index where the byte
--- value is equal to {expr}.
---
--- If {start} is given then start looking at the item with index
--- {start} (may be negative for an item relative to the end).
---
--- When {ic} is given and it is |TRUE|, ignore case.  Otherwise
--- case must match.
---
--- -1 is returned when {expr} is not found in {object}.
--- Example: >vim
---   let idx = index(words, "the")
---   if index(numbers, 123) >= 0
---     " ...
---   endif
--- <
---
--- @param object any
--- @param expr any
--- @param start? integer
--- @param ic? boolean
--- @return integer
function vim.fn.index(object, expr, start, ic) end

--- Returns the index of an item in {object} where {expr} is
--- v:true.  {object} must be a |List| or a |Blob|.
---
--- If {object} is a |List|, evaluate {expr} for each item in the
--- List until the expression is v:true and return the index of
--- this item.
---
--- If {object} is a |Blob| evaluate {expr} for each byte in the
--- Blob until the expression is v:true and return the index of
--- this byte.
---
--- {expr} must be a |string| or |Funcref|.
---
--- If {expr} is a |string|: If {object} is a |List|, inside
--- {expr} |v:key| has the index of the current List item and
--- |v:val| has the value of the item.  If {object} is a |Blob|,
--- inside {expr} |v:key| has the index of the current byte and
--- |v:val| has the byte value.
---
--- If {expr} is a |Funcref| it must take two arguments:
---   1. the key or the index of the current item.
---   2. the value of the current item.
--- The function must return |TRUE| if the item is found and the
--- search should stop.
---
--- The optional argument {opts} is a Dict and supports the
--- following items:
---     startidx  start evaluating {expr} at the item with this
---     index; may be negative for an item relative to
---     the end
--- Returns -1 when {expr} evaluates to v:false for all the items.
--- Example: >vim
---   let l = [#{n: 10}, #{n: 20}, #{n: 30}]
---   echo indexof(l, "v:val.n == 20")
---   echo indexof(l, {i, v -> v.n == 30})
---   echo indexof(l, "v:val.n == 20", #{startidx: 1})
--- <
---
--- @param object any
--- @param expr any
--- @param opts? table
--- @return integer
function vim.fn.indexof(object, expr, opts) end

---
--- @param prompt string
--- @param text? string
--- @param completion? string
--- @return string
function vim.fn.input(prompt, text, completion) end

--- Prompts the user to enter text on the command-line, and
--- returns the text as a String.  The {prompt} argument is either
--- a prompt string, or a blank string (for no prompt).  A '\n'
--- can be used in the prompt to start a new line.
---
--- In the second form it accepts a single dictionary with the
--- following keys, any of which may be omitted:
---
--- Key           Default  Description ~
--- prompt        ""       Same as {prompt} in the first form.
--- default       ""       Same as {text} in the first form.
--- completion    nothing  Same as {completion} in the first form.
--- cancelreturn  ""       The value returned when the dialog is
---                        cancelled.
--- highlight     nothing  Highlight handler: |Funcref|.
---
--- The highlighting set with |:echohl| is used for the prompt.
--- The input is entered just like a command-line, with the same
--- editing commands and mappings.  There is a separate history
--- for lines typed for input().
--- Example: >vim
---   if input("Coffee or beer? ") == "beer"
---     echo "Cheers!"
---   endif
--- <
--- If the optional {text} argument is present and not empty, this
--- is used for the default reply, as if the user typed this.
--- Example: >vim
---   let color = input("Color? ", "white")
---
--- <The optional {completion} argument specifies the type of
--- completion supported for the input.  Without it completion is
--- not performed.  The supported completion types are the same as
--- that can be supplied to a user-defined command using the
--- "-complete=" argument.  Refer to |:command-completion| for
--- more information.  Example: >vim
---   let fname = input("File: ", "", "file")
---
--- <      *input()-highlight* *E5400* *E5402*
--- The optional `highlight` key allows specifying function which
--- will be used for highlighting user input.  This function
--- receives user input as its only argument and must return
--- a list of 3-tuples [hl_start_col, hl_end_col + 1, hl_group]
--- where
---   hl_start_col is the first highlighted column,
---   hl_end_col is the last highlighted column (+ 1!),
---   hl_group is |:hi| group used for highlighting.
---             *E5403* *E5404* *E5405* *E5406*
--- Both hl_start_col and hl_end_col + 1 must point to the start
--- of the multibyte character (highlighting must not break
--- multibyte characters), hl_end_col + 1 may be equal to the
--- input length.  Start column must be in range [0, len(input)),
--- end column must be in range (hl_start_col, len(input)],
--- sections must be ordered so that next hl_start_col is greater
--- then or equal to previous hl_end_col.
---
--- Example (try some input with parentheses): >vim
---   highlight RBP1 guibg=Red ctermbg=red
---   highlight RBP2 guibg=Yellow ctermbg=yellow
---   highlight RBP3 guibg=Green ctermbg=green
---   highlight RBP4 guibg=Blue ctermbg=blue
---   let g:rainbow_levels = 4
---   function! RainbowParens(cmdline)
---     let ret = []
---     let i = 0
---     let lvl = 0
---     while i < len(a:cmdline)
---       if a:cmdline[i] is# '('
---         call add(ret, [i, i + 1, 'RBP' .. ((lvl % g:rainbow_levels) + 1)])
---         let lvl += 1
---       elseif a:cmdline[i] is# ')'
---         let lvl -= 1
---         call add(ret, [i, i + 1, 'RBP' .. ((lvl % g:rainbow_levels) + 1)])
---       endif
---       let i += 1
---     endwhile
---     return ret
---   endfunction
---   call input({'prompt':'>','highlight':'RainbowParens'})
--- <
--- Highlight function is called at least once for each new
--- displayed input string, before command-line is redrawn.  It is
--- expected that function is pure for the duration of one input()
--- call, i.e. it produces the same output for the same input, so
--- output may be memoized.  Function is run like under |:silent|
--- modifier. If the function causes any errors, it will be
--- skipped for the duration of the current input() call.
---
--- Highlighting is disabled if command-line contains arabic
--- characters.
---
--- NOTE: This function must not be used in a startup file, for
--- the versions that only run in GUI mode (e.g., the Win32 GUI).
--- Note: When input() is called from within a mapping it will
--- consume remaining characters from that mapping, because a
--- mapping is handled like the characters were typed.
--- Use |inputsave()| before input() and |inputrestore()|
--- after input() to avoid that.  Another solution is to avoid
--- that further characters follow in the mapping, e.g., by using
--- |:execute| or |:normal|.
---
--- Example with a mapping: >vim
---   nmap \x :call GetFoo()<CR>:exe "/" .. Foo<CR>
---   function GetFoo()
---     call inputsave()
---     let g:Foo = input("enter search pattern: ")
---     call inputrestore()
---   endfunction
--- <
---
--- @param opts table
--- @return string
function vim.fn.input(opts) end

--- @deprecated
--- Use |input()| instead.
---
--- @param ... any
--- @return any
function vim.fn.inputdialog(...) end

--- Displays a list of strings and prompts the user to select
--- one by entering a number.  {textlist} must be a |List| of
--- strings.  Returns the number the user entered.
--- The user can also select an item by clicking on it with the
--- mouse, if the mouse is enabled in the command line ('mouse' is
--- "a" or includes "c").  For the first string 0 is returned.
--- When clicking above the first item a negative number is
--- returned.  When clicking on the prompt one more than the
--- length of {textlist} is returned.
--- Make sure {textlist} has less than 'lines' entries, otherwise
--- it won't work.  It's a good idea to put the entry number at
--- the start of the string.  And put a prompt in the first item.
--- Example: >vim
---   let color = inputlist(['Select color:', '1. red',
---     \ '2. green', '3. blue'])
--- <
---
--- @param textlist string[]
--- @return any
function vim.fn.inputlist(textlist) end

--- Restore typeahead that was saved with a previous |inputsave()|.
--- Should be called the same number of times |inputsave()| is
--- called.  Calling it more often is harmless though.
--- Returns TRUE when there is nothing to restore, FALSE
--- otherwise.
---
--- @return integer
function vim.fn.inputrestore() end

--- Preserve typeahead (also from mappings) and clear it, so that
--- a following prompt gets input from the user.  Should be
--- followed by a matching |inputrestore()| after the prompt.  Can
--- be used several times, in which case there must be just as
--- many |inputrestore()| calls.
--- Returns TRUE when out of memory, FALSE otherwise.
---
--- @return integer
function vim.fn.inputsave() end

--- This function acts much like the |input()| function with but
--- two exceptions:
--- a) the user's response will be displayed as a sequence of
--- asterisks ("*") thereby keeping the entry secret, and
--- b) the user's response will not be recorded on the input
--- |history| stack.
--- The result is a String, which is whatever the user actually
--- typed on the command-line in response to the issued prompt.
--- NOTE: Command-line completion is not supported.
---
--- @param prompt string
--- @param text? string
--- @return string
function vim.fn.inputsecret(prompt, text) end

--- When {object} is a |List| or a |Blob| insert {item} at the start
--- of it.
---
--- If {idx} is specified insert {item} before the item with index
--- {idx}.  If {idx} is zero it goes before the first item, just
--- like omitting {idx}.  A negative {idx} is also possible, see
--- |list-index|.  -1 inserts just before the last item.
---
--- Returns the resulting |List| or |Blob|.  Examples: >vim
---   let mylist = insert([2, 3, 5], 1)
---   call insert(mylist, 4, -1)
---   call insert(mylist, 6, len(mylist))
--- <The last example can be done simpler with |add()|.
--- Note that when {item} is a |List| it is inserted as a single
--- item.  Use |extend()| to concatenate |Lists|.
---
--- @param object any
--- @param item any
--- @param idx? integer
--- @return any
function vim.fn.insert(object, item, idx) end

--- Interrupt script execution.  It works more or less like the
--- user typing CTRL-C, most commands won't execute and control
--- returns to the user.  This is useful to abort execution
--- from lower down, e.g. in an autocommand.  Example: >vim
--- function s:check_typoname(file)
---    if fnamemodify(a:file, ':t') == '['
---        echomsg 'Maybe typo'
---        call interrupt()
---    endif
--- endfunction
--- au BufWritePre * call s:check_typoname(expand('<amatch>'))
--- <
---
--- @return any
function vim.fn.interrupt() end

--- Bitwise invert.  The argument is converted to a number.  A
--- List, Dict or Float argument causes an error.  Example: >vim
---   let bits = invert(bits)
--- <
---
--- @param expr integer
--- @return integer
function vim.fn.invert(expr) end

--- Checks whether {path} is an absolute path.  Returns |TRUE|
--- if so, |FALSE| otherwise.
--- On Unix, a path is considered absolute when it starts with
--- '/'.
--- On MS-Windows, it is considered absolute when it starts with
--- an optional drive prefix and is followed by a '\' or '/'.  UNC
--- paths are always absolute.
--- Example: >vim
---   echo isabsolutepath('/usr/share/')  " 1
---   echo isabsolutepath('./foobar')    " 0
---   echo isabsolutepath('C:\Windows')  " 1
---   echo isabsolutepath('foobar')    " 0
---   echo isabsolutepath('\\remote\file')  " 1
--- <
---
--- @param path string
--- @return 0|1
function vim.fn.isabsolutepath(path) end

--- Returns |TRUE| if {directory} exists, or |FALSE| if it doesn't
--- exist or isn't a directory.  {directory} is any expression,
--- which is used as a String.
---
--- @param directory string
--- @return 0|1
function vim.fn.isdirectory(directory) end

--- Return 1 if {expr} is a positive infinity, or -1 a negative
--- infinity, otherwise 0. >vim
---   echo isinf(1.0 / 0.0)
--- <  1 >vim
---   echo isinf(-1.0 / 0.0)
--- <  -1
---
--- @param expr number
--- @return 1|0|-1
function vim.fn.isinf(expr) end

--- Returns |TRUE| if {expr} is the name of a locked variable,
--- else |FALSE|.
--- The string argument {expr} must be the name of a variable,
--- |List| item or |Dictionary| entry, not the variable itself!
--- Example: >vim
---   let alist = [0, ['a', 'b'], 2, 3]
---   lockvar 1 alist
---   echo islocked('alist')    " 1
---   echo islocked('alist[1]')  " 0
---
--- <When {expr} is a variable that does not exist you get an error
--- message.  Use |exists()| to check for existence.
---
--- @param expr any
--- @return 0|1
function vim.fn.islocked(expr) end

--- Return |TRUE| if {expr} is a float with value NaN. >vim
---   echo isnan(0.0 / 0.0)
--- <  1
---
--- @param expr number
--- @return 0|1
function vim.fn.isnan(expr) end

--- Return a |List| with all key/index and value pairs of {expr}.
--- Each |List| item is a list with two items:
--- - for a |Dict|: the key and the value
--- - for a |List|, |Blob| or |String|: the index and the value
--- The returned |List| is in arbitrary order for a |Dict|,
--- otherwise it's in ascending order of the index.
---
--- Also see |keys()| and |values()|.
---
--- Example: >vim
---   let mydict = #{a: 'red', b: 'blue'}
---   for [key, value] in items(mydict)
---      echo $"{key} = {value}"
---   endfor
---   echo items([1, 2, 3])
---   echo items("foobar")
---   echo items(0z0102)
--- <
---
--- @param expr table|string
--- @return any
function vim.fn.items(expr) end

--- @deprecated
--- Obsolete name for |chanclose()|
---
--- @param ... any
--- @return any
function vim.fn.jobclose(...) end

--- Return the PID (process id) of |job-id| {job}.
---
--- @param job integer
--- @return integer
function vim.fn.jobpid(job) end

--- Resize the pseudo terminal window of |job-id| {job} to {width}
--- columns and {height} rows.
--- Fails if the job was not started with `"pty":v:true`.
---
--- @param job integer
--- @param width integer
--- @param height integer
--- @return any
function vim.fn.jobresize(job, width, height) end

--- @deprecated
--- Obsolete name for |chansend()|
---
--- @param ... any
--- @return any
function vim.fn.jobsend(...) end

--- Lua: Prefer |vim.system()| (unless using `rpc`, `pty`, or `term`).
---
--- Spawns {cmd} as a job.
--- If {cmd} is a List it runs directly (no 'shell').
--- If {cmd} is a String it runs in the 'shell', like this: >vim
---   call jobstart(split(&shell) + split(&shellcmdflag) + ['{cmd}'])
--- <(See |shell-unquoting| for details.)
---
--- Example: start a job and handle its output: >vim
---   call jobstart(['nvim', '-h'], {'on_stdout':{j,d,e->append(line('.'),d)}})
--- <
--- Example: start a job in a |terminal| connected to the current buffer: >vim
---   call jobstart(['nvim', '-h'], {'term':v:true})
--- <
--- Returns |job-id| on success, 0 on invalid arguments (or job
--- table is full), -1 if {cmd}[0] or 'shell' is not executable.
--- The returned job-id is a valid |channel-id| representing the
--- job's stdio streams. Use |chansend()| (or |rpcnotify()| and
--- |rpcrequest()| if "rpc" was enabled) to send data to stdin and
--- |chanclose()| to close the streams without stopping the job.
---
--- See |job-control| and |RPC|.
---
--- NOTE: on Windows if {cmd} is a List:
---   - cmd[0] must be an executable (not a "built-in"). If it is
---     in $PATH it can be called by name, without an extension: >vim
---       call jobstart(['ping', 'neovim.io'])
--- <    If it is a full or partial path, extension is required: >vim
---       call jobstart(['System32\ping.exe', 'neovim.io'])
--- <  - {cmd} is collapsed to a string of quoted args as expected
---     by CommandLineToArgvW https://msdn.microsoft.com/bb776391
---     unless cmd[0] is some form of "cmd.exe".
---
---           *jobstart-env*
--- The job environment is initialized as follows:
---   $NVIM                is set to |v:servername| of the parent Nvim
---   $NVIM_LISTEN_ADDRESS is unset
---   $NVIM_LOG_FILE       is unset
---   $VIM                 is unset
---   $VIMRUNTIME          is unset
--- You can set these with the `env` option.
---
---           *jobstart-options*
--- {opts} is a dictionary with these keys:
---   clear_env:  (boolean) `env` defines the job environment
---         exactly, instead of merging current environment.
---   cwd:        (string, default=|current-directory|) Working
---         directory of the job.
---   detach:     (boolean) Detach the job process: it will not be
---         killed when Nvim exits. If the process exits
---         before Nvim, `on_exit` will be invoked.
---   env:        (dict) Map of environment variable name:value
---         pairs extending (or replace with "clear_env")
---         the current environment. |jobstart-env|
---   height:     (number) Height of the `pty` terminal.
---   |on_exit|:    (function) Callback invoked when the job exits.
---   |on_stdout|:  (function) Callback invoked when the job emits
---         stdout data.
---   |on_stderr|:  (function) Callback invoked when the job emits
---         stderr data.
---   overlapped: (boolean) Sets FILE_FLAG_OVERLAPPED for the
---         stdio passed to the child process. Only on
---         MS-Windows; ignored on other platforms.
---   pty:        (boolean) Connect the job to a new pseudo
---         terminal, and its streams to the master file
---         descriptor. `on_stdout` receives all output,
---         `on_stderr` is ignored. |terminal-start|
---   rpc:        (boolean) Use |msgpack-rpc| to communicate with
---         the job over stdio. Then `on_stdout` is ignored,
---         but `on_stderr` can still be used.
---   stderr_buffered: (boolean) Collect data until EOF (stream closed)
---         before invoking `on_stderr`. |channel-buffered|
---   stdout_buffered: (boolean) Collect data until EOF (stream
---         closed) before invoking `on_stdout`. |channel-buffered|
---   stdin:      (string) Either "pipe" (default) to connect the
---         job's stdin to a channel or "null" to disconnect
---         stdin.
---   term:      (boolean) Spawns {cmd} in a new pseudo-terminal session
---           connected to the current (unmodified) buffer. Implies "pty".
---           Default "height" and "width" are set to the current window
---           dimensions. |jobstart()|. Defaults $TERM to "xterm-256color".
---   width:      (number) Width of the `pty` terminal.
---
--- {opts} is passed as |self| dictionary to the callback; the
--- caller may set other keys to pass application-specific data.
---
--- Returns:
---   - |channel-id| on success
---   - 0 on invalid arguments
---   - -1 if {cmd}[0] is not executable.
--- See also |job-control|, |channel|, |msgpack-rpc|.
---
--- @param cmd string|string[]
--- @param opts? table
--- @return integer
function vim.fn.jobstart(cmd, opts) end

--- Stop |job-id| {id} by sending SIGTERM to the job process. If
--- the process does not terminate after a timeout then SIGKILL
--- will be sent. When the job terminates its |on_exit| handler
--- (if any) will be invoked.
--- See |job-control|.
---
--- Returns 1 for valid job id, 0 for invalid id, including jobs have
--- exited or stopped.
---
--- @param id integer
--- @return integer
function vim.fn.jobstop(id) end

--- Waits for jobs and their |on_exit| handlers to complete.
---
--- {jobs} is a List of |job-id|s to wait for.
--- {timeout} is the maximum waiting time in milliseconds. If
--- omitted or -1, wait forever.
---
--- Timeout of 0 can be used to check the status of a job: >vim
---   let running = jobwait([{job-id}], 0)[0] == -1
--- <
--- During jobwait() callbacks for jobs not in the {jobs} list may
--- be invoked. The screen will not redraw unless |:redraw| is
--- invoked by a callback.
---
--- Returns a list of len({jobs}) integers, where each integer is
--- the status of the corresponding job:
---   Exit-code, if the job exited
---   -1 if the timeout was exceeded
---   -2 if the job was interrupted (by |CTRL-C|)
---   -3 if the job-id is invalid
---
--- @param jobs integer[]
--- @param timeout? integer
--- @return integer[]
function vim.fn.jobwait(jobs, timeout) end

--- Join the items in {list} together into one String.
--- When {sep} is specified it is put in between the items.  If
--- {sep} is omitted a single space is used.
--- Note that {sep} is not added at the end.  You might want to
--- add it there too: >vim
---   let lines = join(mylist, "\n") .. "\n"
--- <String items are used as-is.  |Lists| and |Dictionaries| are
--- converted into a string like with |string()|.
--- The opposite function is |split()|.
---
--- @param list any[]
--- @param sep? string
--- @return string
function vim.fn.join(list, sep) end

--- Convert {expr} from JSON object.  Accepts |readfile()|-style
--- list as the input, as well as regular string.  May output any
--- Vim value. In the following cases it will output
--- |msgpack-special-dict|:
--- 1. Dictionary contains duplicate key.
--- 2. String contains NUL byte.  Two special dictionaries: for
---    dictionary and for string will be emitted in case string
---    with NUL byte was a dictionary key.
---
--- Note: function treats its input as UTF-8 always.  The JSON
--- standard allows only a few encodings, of which UTF-8 is
--- recommended and the only one required to be supported.
--- Non-UTF-8 characters are an error.
---
--- @param expr any
--- @return any
function vim.fn.json_decode(expr) end

--- Convert {expr} into a JSON string.  Accepts
--- |msgpack-special-dict| as the input.  Will not convert
--- |Funcref|s, mappings with non-string keys (can be created as
--- |msgpack-special-dict|), values with self-referencing
--- containers, strings which contain non-UTF-8 characters,
--- pseudo-UTF-8 strings which contain codepoints reserved for
--- surrogate pairs (such strings are not valid UTF-8 strings).
--- Non-printable characters are converted into "\u1234" escapes
--- or special escapes like "\t", other are dumped as-is.
--- |Blob|s are converted to arrays of the individual bytes.
---
--- @param expr any
--- @return string
function vim.fn.json_encode(expr) end

--- Return a |List| with all the keys of {dict}.  The |List| is in
--- arbitrary order.  Also see |items()| and |values()|.
---
--- @param dict table
--- @return string[]
function vim.fn.keys(dict) end

--- Turn the internal byte representation of keys into a form that
--- can be used for |:map|.  E.g. >vim
---   let xx = "\<C-Home>"
---   echo keytrans(xx)
--- <  <C-Home>
---
--- @param string string
--- @return string
function vim.fn.keytrans(string) end

--- @deprecated
--- Obsolete name for bufnr("$").
---
--- @return any
function vim.fn.last_buffer_nr() end

--- Returns the length of the argument.
--- When {expr} is a String or a Number the length in bytes is
--- used, as with |strlen()|.
--- When {expr} is a |List| the number of items in the |List| is
--- returned.
--- When {expr} is a |Blob| the number of bytes is returned.
--- When {expr} is a |Dictionary| the number of entries in the
--- |Dictionary| is returned.
--- Otherwise an error is given and returns zero.
---
--- @param expr any[]
--- @return integer
function vim.fn.len(expr) end

--- Call function {funcname} in the run-time library {libname}
--- with single argument {argument}.
--- This is useful to call functions in a library that you
--- especially made to be used with Vim.  Since only one argument
--- is possible, calling standard library functions is rather
--- limited.
--- The result is the String returned by the function.  If the
--- function returns NULL, this will appear as an empty string ""
--- to Vim.
--- If the function returns a number, use |libcallnr()|!
--- If {argument} is a number, it is passed to the function as an
--- int; if {argument} is a string, it is passed as a
--- null-terminated string.
---
--- libcall() allows you to write your own 'plug-in' extensions to
--- Vim without having to recompile the program.  It is NOT a
--- means to call system functions!  If you try to do so Vim will
--- very probably crash.
---
--- For Win32, the functions you write must be placed in a DLL
--- and use the normal C calling convention (NOT Pascal which is
--- used in Windows System DLLs).  The function must take exactly
--- one parameter, either a character pointer or a long integer,
--- and must return a character pointer or NULL.  The character
--- pointer returned must point to memory that will remain valid
--- after the function has returned (e.g. in static data in the
--- DLL).  If it points to allocated memory, that memory will
--- leak away.  Using a static buffer in the function should work,
--- it's then freed when the DLL is unloaded.
---
--- WARNING: If the function returns a non-valid pointer, Vim may
--- crash!  This also happens if the function returns a number,
--- because Vim thinks it's a pointer.
--- For Win32 systems, {libname} should be the filename of the DLL
--- without the ".DLL" suffix.  A full path is only required if
--- the DLL is not in the usual places.
--- For Unix: When compiling your own plugins, remember that the
--- object code must be compiled as position-independent ('PIC').
--- Examples: >vim
---   echo libcall("libc.so", "getenv", "HOME")
--- <
---
--- @param libname string
--- @param funcname string
--- @param argument any
--- @return any
function vim.fn.libcall(libname, funcname, argument) end

--- Just like |libcall()|, but used for a function that returns an
--- int instead of a string.
--- Examples: >vim
---   echo libcallnr("/usr/lib/libc.so", "getpid", "")
---   call libcallnr("libc.so", "printf", "Hello World!\n")
---   call libcallnr("libc.so", "sleep", 10)
--- <
---
--- @param libname string
--- @param funcname string
--- @param argument any
--- @return any
function vim.fn.libcallnr(libname, funcname, argument) end

--- See |getpos()| for accepted positions.
---
--- To get the column number use |col()|.  To get both use
--- |getpos()|.
---
--- With the optional {winid} argument the values are obtained for
--- that window instead of the current window.
---
--- Returns 0 for invalid values of {expr} and {winid}.
---
--- Examples: >vim
---   echo line(".")      " line number of the cursor
---   echo line(".", winid)    " idem, in window "winid"
---   echo line("'t")      " line number of mark t
---   echo line("'" .. marker)  " line number of mark marker
--- <
--- To jump to the last known position when opening a file see
--- |last-position-jump|.
---
--- @param expr string|integer[]
--- @param winid? integer
--- @return integer
function vim.fn.line(expr, winid) end

--- Return the byte count from the start of the buffer for line
--- {lnum}.  This includes the end-of-line character, depending on
--- the 'fileformat' option for the current buffer.  The first
--- line returns 1. UTF-8 encoding is used, 'fileencoding' is
--- ignored.  This can also be used to get the byte count for the
--- line just below the last line: >vim
---   echo line2byte(line("$") + 1)
--- <This is the buffer size plus one.  If 'fileencoding' is empty
--- it is the file size plus one.  {lnum} is used like with
--- |getline()|.  When {lnum} is invalid -1 is returned.
--- Also see |byte2line()|, |go| and |:goto|.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.line2byte(lnum) end

--- Get the amount of indent for line {lnum} according the lisp
--- indenting rules, as with 'lisp'.
--- The indent is counted in spaces, the value of 'tabstop' is
--- relevant.  {lnum} is used just like in |getline()|.
--- When {lnum} is invalid, -1 is returned.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.lispindent(lnum) end

--- Return a Blob concatenating all the number values in {list}.
--- Examples: >vim
---   echo list2blob([1, 2, 3, 4])  " returns 0z01020304
---   echo list2blob([])    " returns 0z
--- <Returns an empty Blob on error.  If one of the numbers is
--- negative or more than 255 error *E1239* is given.
---
--- |blob2list()| does the opposite.
---
--- @param list any[]
--- @return string
function vim.fn.list2blob(list) end

--- Convert each number in {list} to a character string can
--- concatenate them all.  Examples: >vim
---   echo list2str([32])    " returns " "
---   echo list2str([65, 66, 67])  " returns "ABC"
--- <The same can be done (slowly) with: >vim
---   echo join(map(list, {nr, val -> nr2char(val)}), '')
--- <|str2list()| does the opposite.
---
--- UTF-8 encoding is always used, {utf8} option has no effect,
--- and exists only for backwards-compatibility.
--- With UTF-8 composing characters work as expected: >vim
---   echo list2str([97, 769])  " returns "á"
--- <
--- Returns an empty string on error.
---
--- @param list any[]
--- @param utf8? boolean
--- @return string
function vim.fn.list2str(list, utf8) end

--- Return the current time, measured as seconds since 1st Jan
--- 1970.  See also |strftime()|, |strptime()| and |getftime()|.
---
--- @return integer
function vim.fn.localtime() end

--- Return the natural logarithm (base e) of {expr} as a |Float|.
--- {expr} must evaluate to a |Float| or a |Number| in the range
--- (0, inf].
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo log(10)
--- <  2.302585 >vim
---   echo log(exp(5))
--- <  5.0
---
--- @param expr number
--- @return number
function vim.fn.log(expr) end

--- Return the logarithm of Float {expr} to base 10 as a |Float|.
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo log10(1000)
--- <  3.0 >vim
---   echo log10(0.01)
--- <  -2.0
---
--- @param expr number
--- @return number
function vim.fn.log10(expr) end

--- {expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
--- When {expr1} is a |List| or |Dictionary|, replace each
--- item in {expr1} with the result of evaluating {expr2}.
--- For a |Blob| each byte is replaced.
--- For a |String|, each character, including composing
--- characters, is replaced.
--- If the item type changes you may want to use |mapnew()| to
--- create a new List or Dictionary.
---
--- {expr2} must be a |String| or |Funcref|.
---
--- If {expr2} is a |String|, inside {expr2} |v:val| has the value
--- of the current item.  For a |Dictionary| |v:key| has the key
--- of the current item and for a |List| |v:key| has the index of
--- the current item.  For a |Blob| |v:key| has the index of the
--- current byte.  For a |String| |v:key| has the index of the
--- current character.
--- Example: >vim
---   call map(mylist, '"> " .. v:val .. " <"')
--- <This puts "> " before and " <" after each item in "mylist".
---
--- Note that {expr2} is the result of an expression and is then
--- used as an expression again.  Often it is good to use a
--- |literal-string| to avoid having to double backslashes.  You
--- still have to double ' quotes
---
--- If {expr2} is a |Funcref| it is called with two arguments:
---   1. The key or the index of the current item.
---   2. the value of the current item.
--- The function must return the new value of the item.  Example
--- that changes each value by "key-value": >vim
---   func KeyValue(key, val)
---     return a:key .. '-' .. a:val
---   endfunc
---   call map(myDict, function('KeyValue'))
--- <It is shorter when using a |lambda|: >vim
---   call map(myDict, {key, val -> key .. '-' .. val})
--- <If you do not use "val" you can leave it out: >vim
---   call map(myDict, {key -> 'item: ' .. key})
--- <If you do not use "key" you can use a short name: >vim
---   call map(myDict, {_, val -> 'item: ' .. val})
--- <
--- The operation is done in-place for a |List| and |Dictionary|.
--- If you want it to remain unmodified make a copy first: >vim
---   let tlist = map(copy(mylist), ' v:val .. "\t"')
---
--- <Returns {expr1}, the |List| or |Dictionary| that was filtered,
--- or a new |Blob| or |String|.
--- When an error is encountered while evaluating {expr2} no
--- further items in {expr1} are processed.
--- When {expr2} is a Funcref errors inside a function are
--- ignored, unless it was defined with the "abort" flag.
---
--- @param expr1 string|table|any[]
--- @param expr2 string|function
--- @return any
function vim.fn.map(expr1, expr2) end

--- When {dict} is omitted or zero: Return the rhs of mapping
--- {name} in mode {mode}.  The returned String has special
--- characters translated like in the output of the ":map" command
--- listing.  When {dict} is TRUE a dictionary is returned, see
--- below.  To get a list of all mappings see |maplist()|.
---
--- When there is no mapping for {name}, an empty String is
--- returned if {dict} is FALSE, otherwise returns an empty Dict.
--- When the mapping for {name} is empty, then "<Nop>" is
--- returned.
---
--- The {name} can have special key names, like in the ":map"
--- command.
---
--- {mode} can be one of these strings:
---   "n"  Normal
---   "v"  Visual (including Select)
---   "o"  Operator-pending
---   "i"  Insert
---   "c"  Cmd-line
---   "s"  Select
---   "x"  Visual
---   "l"  langmap |language-mapping|
---   "t"  Terminal
---   ""  Normal, Visual and Operator-pending
--- When {mode} is omitted, the modes for "" are used.
---
--- When {abbr} is there and it is |TRUE| use abbreviations
--- instead of mappings.
---
--- When {dict} is |TRUE|, return a dictionary describing the
--- mapping, with these items:    *mapping-dict*
---   "lhs"       The {lhs} of the mapping as it would be typed
---   "lhsraw"   The {lhs} of the mapping as raw bytes
---   "lhsrawalt" The {lhs} of the mapping as raw bytes, alternate
---         form, only present when it differs from "lhsraw"
---   "rhs"       The {rhs} of the mapping as typed.
---   "callback" Lua function, if RHS was defined as such.
---   "silent"   1 for a |:map-silent| mapping, else 0.
---   "noremap"  1 if the {rhs} of the mapping is not remappable.
---   "script"   1 if mapping was defined with <script>.
---   "expr"     1 for an expression mapping (|:map-<expr>|).
---   "buffer"   1 for a buffer local mapping (|:map-local|).
---   "mode"     Modes for which the mapping is defined.  In
---        addition to the modes mentioned above, these
---        characters will be used:
---        " "     Normal, Visual and Operator-pending
---        "!"     Insert and Commandline mode
---          (|mapmode-ic|)
---   "sid"       The script local ID, used for <sid> mappings
---        (|<SID>|).  Negative for special contexts.
---   "scriptversion"  The version of the script, always 1.
---   "lnum"     The line number in "sid", zero if unknown.
---   "nowait"   Do not wait for other, longer mappings.
---        (|:map-<nowait>|).
---   "abbr"     True if this is an |abbreviation|.
---   "mode_bits" Nvim's internal binary representation of "mode".
---        |mapset()| ignores this; only "mode" is used.
---        See |maplist()| for usage examples.  The values
---        are from src/nvim/state_defs.h and may change in
---        the future.
---
--- The dictionary can be used to restore a mapping with
--- |mapset()|.
---
--- The mappings local to the current buffer are checked first,
--- then the global mappings.
--- This function can be used to map a key even when it's already
--- mapped, and have it do the original mapping too.  Sketch: >vim
---   exe 'nnoremap <Tab> ==' .. maparg('<Tab>', 'n')
--- <
---
--- @param name string
--- @param mode? string
--- @param abbr? boolean
--- @param dict? false
--- @return string
function vim.fn.maparg(name, mode, abbr, dict) end

--- @param name string
--- @param mode string
--- @param abbr boolean
--- @param dict true
--- @return table<string,any>
function vim.fn.maparg(name, mode, abbr, dict) end

--- Check if there is a mapping that matches with {name} in mode
--- {mode}.  See |maparg()| for {mode} and special names in
--- {name}.
--- When {abbr} is there and it is non-zero use abbreviations
--- instead of mappings.
--- A match happens with a mapping that starts with {name} and
--- with a mapping which is equal to the start of {name}.
---
---   matches mapping "a"  "ab"  "abc" ~
---    mapcheck("a")  yes  yes   yes
---    mapcheck("abc")  yes  yes   yes
---    mapcheck("ax")  yes  no   no
---    mapcheck("b")  no  no   no
---
--- The difference with |maparg()| is that mapcheck() finds a
--- mapping that matches with {name}, while |maparg()| only finds a
--- mapping for {name} exactly.
--- When there is no mapping that starts with {name}, an empty
--- String is returned.  If there is one, the RHS of that mapping
--- is returned.  If there are several mappings that start with
--- {name}, the RHS of one of them is returned.  This will be
--- "<Nop>" if the RHS is empty.
--- The mappings local to the current buffer are checked first,
--- then the global mappings.
--- This function can be used to check if a mapping can be added
--- without being ambiguous.  Example: >vim
---   if mapcheck("_vv") == ""
---      map _vv :set guifont=7x13<CR>
---   endif
--- <This avoids adding the "_vv" mapping when there already is a
--- mapping for "_v" or for "_vvv".
---
--- @param name string
--- @param mode? string
--- @param abbr? boolean
--- @return any
function vim.fn.mapcheck(name, mode, abbr) end

--- Returns a |List| of all mappings.  Each List item is a |Dict|,
--- the same as what is returned by |maparg()|, see
--- |mapping-dict|.  When {abbr} is there and it is |TRUE| use
--- abbreviations instead of mappings.
---
--- Example to show all mappings with "MultiMatch" in rhs: >vim
---   echo maplist()->filter({_, m ->
---     \ match(get(m, 'rhs', ''), 'MultiMatch') >= 0
---     \ })
--- <It can be tricky to find mappings for particular |:map-modes|.
--- |mapping-dict|'s "mode_bits" can simplify this.  For example,
--- the mode_bits for Normal, Insert or Command-line modes are
--- 0x19.  To find all the mappings available in those modes you
--- can do: >vim
---   let saved_maps = []
---   for m in maplist()
---       if and(m.mode_bits, 0x19) != 0
---     eval saved_maps->add(m)
---       endif
---   endfor
---   echo saved_maps->mapnew({_, m -> m.lhs})
--- <The values of the mode_bits are defined in Nvim's
--- src/nvim/state_defs.h file and they can be discovered at
--- runtime using |:map-commands| and "maplist()".  Example: >vim
---   omap xyzzy <Nop>
---   let op_bit = maplist()->filter(
---       \ {_, m -> m.lhs == 'xyzzy'})[0].mode_bits
---   ounmap xyzzy
---   echo printf("Operator-pending mode bit: 0x%x", op_bit)
--- <
---
--- @param abbr? 0|1
--- @return table[]
function vim.fn.maplist(abbr) end

--- Like |map()| but instead of replacing items in {expr1} a new
--- List or Dictionary is created and returned.  {expr1} remains
--- unchanged.  Items can still be changed by {expr2}, if you
--- don't want that use |deepcopy()| first.
---
--- @param expr1 any
--- @param expr2 any
--- @return any
function vim.fn.mapnew(expr1, expr2) end

--- @param mode string
--- @param abbr? boolean
--- @param dict? table<string,any>
--- @return any
function vim.fn.mapset(mode, abbr, dict) end

--- Restore a mapping from a dictionary, possibly returned by
--- |maparg()| or |maplist()|.  A buffer mapping, when dict.buffer
--- is true, is set on the current buffer; it is up to the caller
--- to ensure that the intended buffer is the current buffer.
--- This feature allows copying mappings from one buffer to
--- another.
--- The dict.mode value may restore a single mapping that covers
--- more than one mode, like with mode values of '!', ' ', "nox",
--- or 'v'. *E1276*
---
--- In the first form, {mode} and {abbr} should be the same as
--- for the call to |maparg()|. *E460*
--- {mode} is used to define the mode in which the mapping is set,
--- not the "mode" entry in {dict}.
--- Example for saving and restoring a mapping: >vim
---   let save_map = maparg('K', 'n', 0, 1)
---   nnoremap K somethingelse
---   " ...
---   call mapset('n', 0, save_map)
--- <Note that if you are going to replace a map in several modes,
--- e.g. with `:map!`, you need to save/restore the mapping for
--- all of them, when they might differ.
---
--- In the second form, with {dict} as the only argument, mode
--- and abbr are taken from the dict.
--- Example: >vim
---   let save_maps = maplist()->filter(
---         \ {_, m -> m.lhs == 'K'})
---   nnoremap K somethingelse
---   cnoremap K somethingelse2
---   " ...
---   unmap K
---   for d in save_maps
---       call mapset(d)
---   endfor
--- <
---
--- @param dict table<string,any>
--- @return any
function vim.fn.mapset(dict) end

--- When {expr} is a |List| then this returns the index of the
--- first item where {pat} matches.  Each item is used as a
--- String, |Lists| and |Dictionaries| are used as echoed.
---
--- Otherwise, {expr} is used as a String.  The result is a
--- Number, which gives the index (byte offset) in {expr} where
--- {pat} matches.
---
--- A match at the first character or |List| item returns zero.
--- If there is no match -1 is returned.
---
--- For getting submatches see |matchlist()|.
--- Example: >vim
---   echo match("testing", "ing")  " results in 4
---   echo match([1, 'x'], '\a')  " results in 1
--- <See |string-match| for how {pat} is used.
---           *strpbrk()*
--- Vim doesn't have a strpbrk() function.  But you can do: >vim
---   let sepidx = match(line, '[.,;: \t]')
--- <          *strcasestr()*
--- Vim doesn't have a strcasestr() function.  But you can add
--- "\c" to the pattern to ignore case: >vim
---   let idx = match(haystack, '\cneedle')
--- <
--- If {start} is given, the search starts from byte index
--- {start} in a String or item {start} in a |List|.
--- The result, however, is still the index counted from the
--- first character/item.  Example: >vim
---   echo match("testing", "ing", 2)
--- <result is again "4". >vim
---   echo match("testing", "ing", 4)
--- <result is again "4". >vim
---   echo match("testing", "t", 2)
--- <result is "3".
--- For a String, if {start} > 0 then it is like the string starts
--- {start} bytes later, thus "^" will match at {start}.  Except
--- when {count} is given, then it's like matches before the
--- {start} byte are ignored (this is a bit complicated to keep it
--- backwards compatible).
--- For a String, if {start} < 0, it will be set to 0.  For a list
--- the index is counted from the end.
--- If {start} is out of range ({start} > strlen({expr}) for a
--- String or {start} > len({expr}) for a |List|) -1 is returned.
---
--- When {count} is given use the {count}th match.  When a match
--- is found in a String the search for the next one starts one
--- character further.  Thus this example results in 1: >vim
---   echo match("testing", "..", 0, 2)
--- <In a |List| the search continues in the next item.
--- Note that when {count} is added the way {start} works changes,
--- see above.
---
---         *match-pattern*
--- See |pattern| for the patterns that are accepted.
--- The 'ignorecase' option is used to set the ignore-caseness of
--- the pattern.  'smartcase' is NOT used.  The matching is always
--- done like 'magic' is set and 'cpoptions' is empty.
--- Note that a match at the start is preferred, thus when the
--- pattern is using "*" (any number of matches) it tends to find
--- zero matches at the start instead of a number of matches
--- further down in the text.
---
--- @param expr string|any[]
--- @param pat string
--- @param start? integer
--- @param count? integer
--- @return integer
function vim.fn.match(expr, pat, start, count) end

--- Defines a pattern to be highlighted in the current window (a
--- "match").  It will be highlighted with {group}.  Returns an
--- identification number (ID), which can be used to delete the
--- match using |matchdelete()|.  The ID is bound to the window.
--- Matching is case sensitive and magic, unless case sensitivity
--- or magicness are explicitly overridden in {pattern}.  The
--- 'magic', 'smartcase' and 'ignorecase' options are not used.
--- The "Conceal" value is special, it causes the match to be
--- concealed.
---
--- The optional {priority} argument assigns a priority to the
--- match.  A match with a high priority will have its
--- highlighting overrule that of a match with a lower priority.
--- A priority is specified as an integer (negative numbers are no
--- exception).  If the {priority} argument is not specified, the
--- default priority is 10.  The priority of 'hlsearch' is zero,
--- hence all matches with a priority greater than zero will
--- overrule it.  Syntax highlighting (see 'syntax') is a separate
--- mechanism, and regardless of the chosen priority a match will
--- always overrule syntax highlighting.
---
--- The optional {id} argument allows the request for a specific
--- match ID.  If a specified ID is already taken, an error
--- message will appear and the match will not be added.  An ID
--- is specified as a positive integer (zero excluded).  IDs 1, 2
--- and 3 are reserved for |:match|, |:2match| and |:3match|,
--- respectively.  3 is reserved for use by the |matchparen|
--- plugin.
--- If the {id} argument is not specified or -1, |matchadd()|
--- automatically chooses a free ID, which is at least 1000.
---
--- The optional {dict} argument allows for further custom
--- values.  Currently this is used to specify a match specific
--- conceal character that will be shown for |hl-Conceal|
--- highlighted matches.  The dict can have the following members:
---
---   conceal      Special character to show instead of the
---         match (only for |hl-Conceal| highlighted
---         matches, see |:syn-cchar|)
---   window      Instead of the current window use the
---         window with this number or window ID.
---
--- The number of matches is not limited, as it is the case with
--- the |:match| commands.
---
--- Returns -1 on error.
---
--- Example: >vim
---   highlight MyGroup ctermbg=green guibg=green
---   let m = matchadd("MyGroup", "TODO")
--- <Deletion of the pattern: >vim
---   call matchdelete(m)
---
--- <A list of matches defined by |matchadd()| and |:match| are
--- available from |getmatches()|.  All matches can be deleted in
--- one operation by |clearmatches()|.
---
--- @param group integer|string
--- @param pattern string
--- @param priority? integer
--- @param id? integer
--- @param dict? table
--- @return integer
function vim.fn.matchadd(group, pattern, priority, id, dict) end

--- Same as |matchadd()|, but requires a list of positions {pos}
--- instead of a pattern.  This command is faster than |matchadd()|
--- because it does not handle regular expressions and it sets
--- buffer line boundaries to redraw screen.  It is supposed to be
--- used when fast match additions and deletions are required, for
--- example to highlight matching parentheses.
---           *E5030* *E5031*
--- {pos} is a list of positions.  Each position can be one of
--- these:
--- - A number.  This whole line will be highlighted.  The first
---   line has number 1.
--- - A list with one number, e.g., [23].  The whole line with
---   this number will be highlighted.
--- - A list with two numbers, e.g., [23, 11].  The first number
---   is the line number, the second one is the column number
---   (first column is 1, the value must correspond to the byte
---   index as |col()| would return).  The character at this
---   position will be highlighted.
--- - A list with three numbers, e.g., [23, 11, 3].  As above, but
---   the third number gives the length of the highlight in bytes.
---
--- Entries with zero and negative line numbers are silently
--- ignored, as well as entries with negative column numbers and
--- lengths.
---
--- Returns -1 on error.
---
--- Example: >vim
---   highlight MyGroup ctermbg=green guibg=green
---   let m = matchaddpos("MyGroup", [[23, 24], 34])
--- <Deletion of the pattern: >vim
---   call matchdelete(m)
---
--- <Matches added by |matchaddpos()| are returned by
--- |getmatches()|.
---
--- @param group integer|string
--- @param pos any[]
--- @param priority? integer
--- @param id? integer
--- @param dict? table
--- @return integer|table
function vim.fn.matchaddpos(group, pos, priority, id, dict) end

--- Selects the {nr} match item, as set with a |:match|,
--- |:2match| or |:3match| command.
--- Return a |List| with two elements:
---   The name of the highlight group used
---   The pattern used.
--- When {nr} is not 1, 2 or 3 returns an empty |List|.
--- When there is no match item set returns ['', ''].
--- This is useful to save and restore a |:match|.
--- Highlighting matches using the |:match| commands are limited
--- to three matches.  |matchadd()| does not have this limitation.
---
--- @param nr integer
--- @return string[]
function vim.fn.matcharg(nr) end

--- Returns the |List| of matches in lines from {lnum} to {end} in
--- buffer {buf} where {pat} matches.
---
--- {lnum} and {end} can either be a line number or the string "$"
--- to refer to the last line in {buf}.
---
--- The {dict} argument supports following items:
---     submatches  include submatch information (|/\(|)
---
--- For each match, a |Dict| with the following items is returned:
---     byteidx  starting byte index of the match
---     lnum  line number where there is a match
---     text  matched string
--- Note that there can be multiple matches in a single line.
---
--- This function works only for loaded buffers.  First call
--- |bufload()| if needed.
---
--- See |match-pattern| for information about the effect of some
--- option settings on the pattern.
---
--- When {buf} is not a valid buffer, the buffer is not loaded or
--- {lnum} or {end} is not valid then an error is given and an
--- empty |List| is returned.
---
--- Examples: >vim
---     " Assuming line 3 in buffer 5 contains "a"
---     echo matchbufline(5, '\<\k\+\>', 3, 3)
--- <    `[{'lnum': 3, 'byteidx': 0, 'text': 'a'}]` >vim
---     " Assuming line 4 in buffer 10 contains "tik tok"
---     echo matchbufline(10, '\<\k\+\>', 1, 4)
--- <    `[{'lnum': 4, 'byteidx': 0, 'text': 'tik'}, {'lnum': 4, 'byteidx': 4, 'text': 'tok'}]`
---
--- If {submatch} is present and is v:true, then submatches like
--- "\1", "\2", etc. are also returned.  Example: >vim
---     " Assuming line 2 in buffer 2 contains "acd"
---     echo matchbufline(2, '\(a\)\?\(b\)\?\(c\)\?\(.*\)', 2, 2
---         \ {'submatches': v:true})
--- <    `[{'lnum': 2, 'byteidx': 0, 'text': 'acd', 'submatches': ['a', '', 'c', 'd', '', '', '', '', '']}]`
--- The "submatches" List always contains 9 items.  If a submatch
--- is not found, then an empty string is returned for that
--- submatch.
---
--- @param buf string|integer
--- @param pat string
--- @param lnum string|integer
--- @param end_ string|integer
--- @param dict? table
--- @return string[]
function vim.fn.matchbufline(buf, pat, lnum, end_, dict) end

--- Deletes a match with ID {id} previously defined by |matchadd()|
--- or one of the |:match| commands.  Returns 0 if successful,
--- otherwise -1.  See example for |matchadd()|.  All matches can
--- be deleted in one operation by |clearmatches()|.
--- If {win} is specified, use the window with this number or
--- window ID instead of the current window.
---
--- @param id integer
--- @param win? integer
--- @return any
function vim.fn.matchdelete(id, win) end

--- Same as |match()|, but return the index of first character
--- after the match.  Example: >vim
---   echo matchend("testing", "ing")
--- <results in "7".
---           *strspn()* *strcspn()*
--- Vim doesn't have a strspn() or strcspn() function, but you can
--- do it with matchend(): >vim
---   let span = matchend(line, '[a-zA-Z]')
---   let span = matchend(line, '[^a-zA-Z]')
--- <Except that -1 is returned when there are no matches.
---
--- The {start}, if given, has the same meaning as for |match()|. >vim
---   echo matchend("testing", "ing", 2)
--- <results in "7". >vim
---   echo matchend("testing", "ing", 5)
--- <result is "-1".
--- When {expr} is a |List| the result is equal to |match()|.
---
--- @param expr any
--- @param pat string
--- @param start? integer
--- @param count? integer
--- @return integer
function vim.fn.matchend(expr, pat, start, count) end

--- If {list} is a list of strings, then returns a |List| with all
--- the strings in {list} that fuzzy match {str}.  The strings in
--- the returned list are sorted based on the matching score.
---
--- The optional {dict} argument always supports the following
--- items:
---     matchseq  When this item is present return only matches
---     that contain the characters in {str} in the
---     given sequence.
---     limit  Maximum number of matches in {list} to be
---     returned.  Zero means no limit.
---
--- If {list} is a list of dictionaries, then the optional {dict}
--- argument supports the following additional items:
---     key    Key of the item which is fuzzy matched against
---     {str}.  The value of this item should be a
---     string.
---     text_cb  |Funcref| that will be called for every item
---     in {list} to get the text for fuzzy matching.
---     This should accept a dictionary item as the
---     argument and return the text for that item to
---     use for fuzzy matching.
---
--- {str} is treated as a literal string and regular expression
--- matching is NOT supported.  The maximum supported {str} length
--- is 256.
---
--- When {str} has multiple words each separated by white space,
--- then the list of strings that have all the words is returned.
---
--- If there are no matching strings or there is an error, then an
--- empty list is returned.  If length of {str} is greater than
--- 256, then returns an empty list.
---
--- When {limit} is given, matchfuzzy() will find up to this
--- number of matches in {list} and return them in sorted order.
---
--- Refer to |fuzzy-matching| for more information about fuzzy
--- matching strings.
---
--- Example: >vim
---    echo matchfuzzy(["clay", "crow"], "cay")
--- <results in ["clay"]. >vim
---    echo getbufinfo()->map({_, v -> v.name})->matchfuzzy("ndl")
--- <results in a list of buffer names fuzzy matching "ndl". >vim
---    echo getbufinfo()->matchfuzzy("ndl", {'key' : 'name'})
--- <results in a list of buffer information dicts with buffer
--- names fuzzy matching "ndl". >vim
---    echo getbufinfo()->matchfuzzy("spl",
---         \ {'text_cb' : {v -> v.name}})
--- <results in a list of buffer information dicts with buffer
--- names fuzzy matching "spl". >vim
---    echo v:oldfiles->matchfuzzy("test")
--- <results in a list of file names fuzzy matching "test". >vim
---    let l = readfile("buffer.c")->matchfuzzy("str")
--- <results in a list of lines in "buffer.c" fuzzy matching "str". >vim
---    echo ['one two', 'two one']->matchfuzzy('two one')
--- <results in `['two one', 'one two']` . >vim
---    echo ['one two', 'two one']->matchfuzzy('two one',
---         \ {'matchseq': 1})
--- <results in `['two one']`.
---
--- @param list any[]
--- @param str string
--- @param dict? table
--- @return table
function vim.fn.matchfuzzy(list, str, dict) end

--- Same as |matchfuzzy()|, but returns the list of matched
--- strings, the list of character positions where characters
--- in {str} matches and a list of matching scores.  You can
--- use |byteidx()| to convert a character position to a byte
--- position.
---
--- If {str} matches multiple times in a string, then only the
--- positions for the best match is returned.
---
--- If there are no matching strings or there is an error, then a
--- list with three empty list items is returned.
---
--- Example: >vim
---   echo matchfuzzypos(['testing'], 'tsg')
--- <results in [["testing"], [[0, 2, 6]], [99]] >vim
---   echo matchfuzzypos(['clay', 'lacy'], 'la')
--- <results in [["lacy", "clay"], [[0, 1], [1, 2]], [153, 133]] >vim
---   echo [{'text': 'hello', 'id' : 10}]
---     \ ->matchfuzzypos('ll', {'key' : 'text'})
--- <results in `[[{"id": 10, "text": "hello"}], [[2, 3]], [127]]`
---
--- @param list any[]
--- @param str string
--- @param dict? table
--- @return table
function vim.fn.matchfuzzypos(list, str, dict) end

--- Same as |match()|, but return a |List|.  The first item in the
--- list is the matched string, same as what |matchstr()| would
--- return.  Following items are submatches, like "\1", "\2", etc.
--- in |:substitute|.  When an optional submatch didn't match an
--- empty string is used.  Example: >vim
---   echo matchlist('acd', '\(a\)\?\(b\)\?\(c\)\?\(.*\)')
--- <Results in: ['acd', 'a', '', 'c', 'd', '', '', '', '', '']
--- When there is no match an empty list is returned.
---
--- You can pass in a List, but that is not very useful.
---
--- @param expr any
--- @param pat string
--- @param start? integer
--- @param count? integer
--- @return string[]
function vim.fn.matchlist(expr, pat, start, count) end

--- Same as |match()|, but return the matched string.  Example: >vim
---   echo matchstr("testing", "ing")
--- <results in "ing".
--- When there is no match "" is returned.
--- The {start}, if given, has the same meaning as for |match()|. >vim
---   echo matchstr("testing", "ing", 2)
--- <results in "ing". >vim
---   echo matchstr("testing", "ing", 5)
--- <result is "".
--- When {expr} is a |List| then the matching item is returned.
--- The type isn't changed, it's not necessarily a String.
---
--- @param expr any
--- @param pat string
--- @param start? integer
--- @param count? integer
--- @return string
function vim.fn.matchstr(expr, pat, start, count) end

--- Returns the |List| of matches in {list} where {pat} matches.
--- {list} is a |List| of strings.  {pat} is matched against each
--- string in {list}.
---
--- The {dict} argument supports following items:
---     submatches  include submatch information (|/\(|)
---
--- For each match, a |Dict| with the following items is returned:
---     byteidx  starting byte index of the match.
---     idx    index in {list} of the match.
---     text  matched string
---     submatches  a List of submatches.  Present only if
---     "submatches" is set to v:true in {dict}.
---
--- See |match-pattern| for information about the effect of some
--- option settings on the pattern.
---
--- Example: >vim
---     echo matchstrlist(['tik tok'], '\<\k\+\>')
--- <    `[{'idx': 0, 'byteidx': 0, 'text': 'tik'}, {'idx': 0, 'byteidx': 4, 'text': 'tok'}]` >vim
---     echo matchstrlist(['a', 'b'], '\<\k\+\>')
--- <    `[{'idx': 0, 'byteidx': 0, 'text': 'a'}, {'idx': 1, 'byteidx': 0, 'text': 'b'}]`
---
--- If "submatches" is present and is v:true, then submatches like
--- "\1", "\2", etc. are also returned.  Example: >vim
---     echo matchstrlist(['acd'], '\(a\)\?\(b\)\?\(c\)\?\(.*\)',
---         \ #{submatches: v:true})
--- <    `[{'idx': 0, 'byteidx': 0, 'text': 'acd', 'submatches': ['a', '', 'c', 'd', '', '', '', '', '']}]`
--- The "submatches" List always contains 9 items.  If a submatch
--- is not found, then an empty string is returned for that
--- submatch.
---
--- @param list string[]
--- @param pat string
--- @param dict? table
--- @return string[]
function vim.fn.matchstrlist(list, pat, dict) end

--- Same as |matchstr()|, but return the matched string, the start
--- position and the end position of the match.  Example: >vim
---   echo matchstrpos("testing", "ing")
--- <results in ["ing", 4, 7].
--- When there is no match ["", -1, -1] is returned.
--- The {start}, if given, has the same meaning as for |match()|. >vim
---   echo matchstrpos("testing", "ing", 2)
--- <results in ["ing", 4, 7]. >vim
---   echo matchstrpos("testing", "ing", 5)
--- <result is ["", -1, -1].
--- When {expr} is a |List| then the matching item, the index
--- of first item where {pat} matches, the start position and the
--- end position of the match are returned. >vim
---   echo matchstrpos([1, '__x'], '\a')
--- <result is ["x", 1, 2, 3].
--- The type isn't changed, it's not necessarily a String.
---
--- @param expr any
--- @param pat string
--- @param start? integer
--- @param count? integer
--- @return table
function vim.fn.matchstrpos(expr, pat, start, count) end

--- Return the maximum value of all items in {expr}.  Example: >vim
---   echo max([apples, pears, oranges])
---
--- <{expr} can be a |List| or a |Dictionary|.  For a Dictionary,
--- it returns the maximum of all values in the Dictionary.
--- If {expr} is neither a List nor a Dictionary, or one of the
--- items in {expr} cannot be used as a Number this results in
--- an error.  An empty |List| or |Dictionary| results in zero.
---
--- @param expr any
--- @return number
function vim.fn.max(expr) end

--- Returns a |List| of |Dictionaries| describing |menus| (defined
--- by |:menu|, |:amenu|, …), including |hidden-menus|.
---
--- {path} matches a menu by name, or all menus if {path} is an
--- empty string.  Example: >vim
---   echo menu_get('File','')
---   echo menu_get('')
--- <
--- {modes} is a string of zero or more modes (see |maparg()| or
--- |creating-menus| for the list of modes). "a" means "all".
---
--- Example: >vim
---   nnoremenu &Test.Test inormal
---   inoremenu Test.Test insert
---   vnoremenu Test.Test x
---   echo menu_get("")
---
--- <returns something like this: >
---
---   [ {
---     "hidden": 0,
---     "name": "Test",
---     "priority": 500,
---     "shortcut": 84,
---     "submenus": [ {
---       "hidden": 0,
---       "mappings": {
---         i": {
---     "enabled": 1,
---     "noremap": 1,
---     "rhs": "insert",
---     "sid": 1,
---     "silent": 0
---         },
---         n": { ... },
---         s": { ... },
---         v": { ... }
---       },
---       "name": "Test",
---       "priority": 500,
---       "shortcut": 0
---     } ]
---   } ]
--- <
---
--- @param path string
--- @param modes? string
--- @return any
function vim.fn.menu_get(path, modes) end

--- Return information about the specified menu {name} in
--- mode {mode}.  The menu name should be specified without the
--- shortcut character ('&').  If {name} is "", then the top-level
--- menu names are returned.
---
--- {mode} can be one of these strings:
---   "n"  Normal
---   "v"  Visual (including Select)
---   "o"  Operator-pending
---   "i"  Insert
---   "c"  Cmd-line
---   "s"  Select
---   "x"  Visual
---   "t"  Terminal-Job
---   ""  Normal, Visual and Operator-pending
---   "!"  Insert and Cmd-line
--- When {mode} is omitted, the modes for "" are used.
---
--- Returns a |Dictionary| containing the following items:
---   accel    menu item accelerator text |menu-text|
---   display  display name (name without '&')
---   enabled  v:true if this menu item is enabled
---     Refer to |:menu-enable|
---   icon    name of the icon file (for toolbar)
---     |toolbar-icon|
---   iconidx  index of a built-in icon
---   modes    modes for which the menu is defined.  In
---     addition to the modes mentioned above, these
---     characters will be used:
---     " "  Normal, Visual and Operator-pending
---   name    menu item name.
---   noremenu  v:true if the {rhs} of the menu item is not
---     remappable else v:false.
---   priority  menu order priority |menu-priority|
---   rhs    right-hand-side of the menu item.  The
---     returned string has special characters
---     translated like in the output of the ":menu"
---     command listing.  When the {rhs} of a menu
---     item is empty, then "<Nop>" is returned.
---   script  v:true if script-local remapping of {rhs} is
---     allowed else v:false.  See |:menu-script|.
---   shortcut  shortcut key (character after '&' in
---     the menu name) |menu-shortcut|
---   silent  v:true if the menu item is created
---     with <silent> argument |:menu-silent|
---   submenus  |List| containing the names of
---     all the submenus.  Present only if the menu
---     item has submenus.
---
--- Returns an empty dictionary if the menu item is not found.
---
--- Examples: >vim
---   echo menu_info('Edit.Cut')
---   echo menu_info('File.Save', 'n')
---
---   " Display the entire menu hierarchy in a buffer
---   func ShowMenu(name, pfx)
---     let m = menu_info(a:name)
---     call append(line('$'), a:pfx .. m.display)
---     for child in m->get('submenus', [])
---       call ShowMenu(a:name .. '.' .. escape(child, '.'),
---           \ a:pfx .. '    ')
---     endfor
---   endfunc
---   new
---   for topmenu in menu_info('').submenus
---     call ShowMenu(topmenu, '')
---   endfor
--- <
---
--- @param name string
--- @param mode? string
--- @return any
function vim.fn.menu_info(name, mode) end

--- Return the minimum value of all items in {expr}. Example: >vim
---   echo min([apples, pears, oranges])
---
--- <{expr} can be a |List| or a |Dictionary|.  For a Dictionary,
--- it returns the minimum of all values in the Dictionary.
--- If {expr} is neither a List nor a Dictionary, or one of the
--- items in {expr} cannot be used as a Number this results in
--- an error.  An empty |List| or |Dictionary| results in zero.
---
--- @param expr any
--- @return number
function vim.fn.min(expr) end

--- Create directory {name}.
---
--- When {flags} is present it must be a string.  An empty string
--- has no effect.
---
--- {flags} can contain these character flags:
---  "p"  intermediate directories will be created as necessary
---  "D"  {name} will be deleted at the end of the current
---   function, but not recursively |:defer|
---  "R"  {name} will be deleted recursively at the end of the
---   current function |:defer|
---
--- Note that when {name} has more than one part and "p" is used
--- some directories may already exist.  Only the first one that
--- is created and what it contains is scheduled to be deleted.
--- E.g. when using: >vim
---   call mkdir('subdir/tmp/autoload', 'pR')
--- <and "subdir" already exists then "subdir/tmp" will be
--- scheduled for deletion, like with: >vim
---   defer delete('subdir/tmp', 'rf')
--- <
--- If {prot} is given it is used to set the protection bits of
--- the new directory.  The default is 0o755 (rwxr-xr-x: r/w for
--- the user, readable for others).  Use 0o700 to make it
--- unreadable for others.  This is used for the newly created
--- directories.  Note: umask is applied to {prot} (on Unix).
--- Example: >vim
---   call mkdir($HOME .. "/tmp/foo/bar", "p", 0o700)
---
--- <This function is not available in the |sandbox|.
---
--- If you try to create an existing directory with {flags} set to
--- "p" mkdir() will silently exit.
---
--- The function result is a Number, which is TRUE if the call was
--- successful or FALSE if the directory creation failed or partly
--- failed.
---
--- @param name string
--- @param flags? string
--- @param prot? string
--- @return integer
function vim.fn.mkdir(name, flags, prot) end

--- Return a string that indicates the current mode.
--- If {expr} is supplied and it evaluates to a non-zero Number or
--- a non-empty String (|non-zero-arg|), then the full mode is
--- returned, otherwise only the first letter is returned.
--- Also see |state()|.
---
---    n      Normal
---    no      Operator-pending
---    nov      Operator-pending (forced charwise |o_v|)
---    noV      Operator-pending (forced linewise |o_V|)
---    noCTRL-V Operator-pending (forced blockwise |o_CTRL-V|)
---     CTRL-V is one character
---    niI      Normal using |i_CTRL-O| in |Insert-mode|
---    niR      Normal using |i_CTRL-O| in |Replace-mode|
---    niV      Normal using |i_CTRL-O| in |Virtual-Replace-mode|
---    nt      Normal in |terminal-emulator| (insert goes to
---     Terminal mode)
---    ntT      Normal using |t_CTRL-\_CTRL-O| in |Terminal-mode|
---    v      Visual by character
---    vs      Visual by character using |v_CTRL-O| in Select mode
---    V      Visual by line
---    Vs      Visual by line using |v_CTRL-O| in Select mode
---    CTRL-V   Visual blockwise
---    CTRL-Vs  Visual blockwise using |v_CTRL-O| in Select mode
---    s      Select by character
---    S      Select by line
---    CTRL-S   Select blockwise
---    i      Insert
---    ic      Insert mode completion |compl-generic|
---    ix      Insert mode |i_CTRL-X| completion
---    R      Replace |R|
---    Rc      Replace mode completion |compl-generic|
---    Rx      Replace mode |i_CTRL-X| completion
---    Rv      Virtual Replace |gR|
---    Rvc      Virtual Replace mode completion |compl-generic|
---    Rvx      Virtual Replace mode |i_CTRL-X| completion
---    c      Command-line editing
---    cr      Command-line editing overstrike mode |c_<Insert>|
---    cv      Vim Ex mode |gQ|
---    cvr      Vim Ex mode while in overstrike mode |c_<Insert>|
---    r      Hit-enter prompt
---    rm      The -- more -- prompt
---    r?      A |:confirm| query of some sort
---    !      Shell or external command is executing
---    t      Terminal mode: keys go to the job
---
--- This is useful in the 'statusline' option or RPC calls. In
--- most other places it always returns "c" or "n".
--- Note that in the future more modes and more specific modes may
--- be added.  It's better not to compare the whole string but
--- only the leading character(s).
--- Also see |visualmode()|.
---
--- @param expr? any
--- @return any
function vim.fn.mode(expr) end

--- Convert a list of Vimscript objects to msgpack. Returned value is a
--- |readfile()|-style list. When {type} contains "B", a |Blob| is
--- returned instead. Example: >vim
---   call writefile(msgpackdump([{}]), 'fname.mpack', 'b')
--- <or, using a |Blob|: >vim
---   call writefile(msgpackdump([{}], 'B'), 'fname.mpack')
--- <
--- This will write the single 0x80 byte to a `fname.mpack` file
--- (dictionary with zero items is represented by 0x80 byte in
--- messagepack).
---
--- Limitations:        *E5004* *E5005*
--- 1. |Funcref|s cannot be dumped.
--- 2. Containers that reference themselves cannot be dumped.
--- 3. Dictionary keys are always dumped as STR strings.
--- 4. Other strings and |Blob|s are always dumped as BIN strings.
--- 5. Points 3. and 4. do not apply to |msgpack-special-dict|s.
---
--- @param list any
--- @param type? any
--- @return any
function vim.fn.msgpackdump(list, type) end

--- Convert a |readfile()|-style list or a |Blob| to a list of
--- Vimscript objects.
--- Example: >vim
---   let fname = expand('~/.config/nvim/shada/main.shada')
---   let mpack = readfile(fname, 'b')
---   let shada_objects = msgpackparse(mpack)
--- <This will read ~/.config/nvim/shada/main.shada file to
--- `shada_objects` list.
---
--- Limitations:
--- 1. Mapping ordering is not preserved unless messagepack
---    mapping is dumped using generic mapping
---    (|msgpack-special-map|).
--- 2. Since the parser aims to preserve all data untouched
---    (except for 1.) some strings are parsed to
---    |msgpack-special-dict| format which is not convenient to
---    use.
---           *msgpack-special-dict*
--- Some messagepack strings may be parsed to special
--- dictionaries. Special dictionaries are dictionaries which
---
--- 1. Contain exactly two keys: `_TYPE` and `_VAL`.
--- 2. `_TYPE` key is one of the types found in |v:msgpack_types|
---    variable.
--- 3. Value for `_VAL` has the following format (Key column
---    contains name of the key from |v:msgpack_types|):
---
--- Key  Value ~
--- nil  Zero, ignored when dumping.  Not returned by
---   |msgpackparse()| since |v:null| was introduced.
--- boolean  One or zero.  When dumping it is only checked that
---   value is a |Number|.  Not returned by |msgpackparse()|
---   since |v:true| and |v:false| were introduced.
--- integer  |List| with four numbers: sign (-1 or 1), highest two
---   bits, number with bits from 62nd to 31st, lowest 31
---   bits. I.e. to get actual number one will need to use
---   code like >
---     _VAL[0] * ((_VAL[1] << 62)
---                & (_VAL[2] << 31)
---                & _VAL[3])
--- <  Special dictionary with this type will appear in
---   |msgpackparse()| output under one of the following
---   circumstances:
---   1. |Number| is 32-bit and value is either above
---      INT32_MAX or below INT32_MIN.
---   2. |Number| is 64-bit and value is above INT64_MAX. It
---      cannot possibly be below INT64_MIN because msgpack
---      C parser does not support such values.
--- float  |Float|. This value cannot possibly appear in
---   |msgpackparse()| output.
--- string  |String|, or |Blob| if binary string contains zero
---   byte. This value cannot appear in |msgpackparse()|
---   output since blobs were introduced.
--- array  |List|. This value cannot appear in |msgpackparse()|
---   output.
---           *msgpack-special-map*
--- map  |List| of |List|s with two items (key and value) each.
---   This value will appear in |msgpackparse()| output if
---   parsed mapping contains one of the following keys:
---   1. Any key that is not a string (including keys which
---      are binary strings).
---   2. String with NUL byte inside.
---   3. Duplicate key.
--- ext  |List| with two values: first is a signed integer
---   representing extension type. Second is
---   |readfile()|-style list of strings.
---
--- @param data any
--- @return any
function vim.fn.msgpackparse(data) end

--- Return the line number of the first line at or below {lnum}
--- that is not blank.  Example: >vim
---   if getline(nextnonblank(1)) =~ "Java" | endif
--- <When {lnum} is invalid or there is no non-blank line at or
--- below it, zero is returned.
--- {lnum} is used like with |getline()|.
--- See also |prevnonblank()|.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.nextnonblank(lnum) end

--- Return a string with a single character, which has the number
--- value {expr}.  Examples: >vim
---   echo nr2char(64)    " returns '\@'
---   echo nr2char(32)    " returns ' '
--- <Example for "utf-8": >vim
---   echo nr2char(300)    " returns I with bow character
--- <
--- UTF-8 encoding is always used, {utf8} option has no effect,
--- and exists only for backwards-compatibility.
--- Note that a NUL character in the file is specified with
--- nr2char(10), because NULs are represented with newline
--- characters.  nr2char(0) is a real NUL and terminates the
--- string, thus results in an empty string.
---
--- @param expr integer
--- @param utf8? boolean
--- @return string
function vim.fn.nr2char(expr, utf8) end

--- Bitwise OR on the two arguments.  The arguments are converted
--- to a number.  A List, Dict or Float argument causes an error.
--- Also see `and()` and `xor()`.
--- Example: >vim
---   let bits = or(bits, 0x80)
---
--- <Rationale: The reason this is a function and not using the "|"
--- character like many languages, is that Vi has always used "|"
--- to separate commands.  In many places it would not be clear if
--- "|" is an operator or a command separator.
---
--- @param expr number
--- @param expr1 number
--- @return any
vim.fn['or'] = function(expr, expr1) end

--- Shorten directory names in the path {path} and return the
--- result.  The tail, the file name, is kept as-is.  The other
--- components in the path are reduced to {len} letters in length.
--- If {len} is omitted or smaller than 1 then 1 is used (single
--- letters).  Leading '~' and '.' characters are kept.  Examples: >vim
---   echo pathshorten('~/.config/nvim/autoload/file1.vim')
--- <  ~/.c/n/a/file1.vim ~
--- >vim
---   echo pathshorten('~/.config/nvim/autoload/file2.vim', 2)
--- <  ~/.co/nv/au/file2.vim ~
--- It doesn't matter if the path exists or not.
--- Returns an empty string on error.
---
--- @param path string
--- @param len? integer
--- @return string
function vim.fn.pathshorten(path, len) end

--- Evaluate |perl| expression {expr} and return its result
--- converted to Vim data structures.
--- Numbers and strings are returned as they are (strings are
--- copied though).
--- Lists are represented as Vim |List| type.
--- Dictionaries are represented as Vim |Dictionary| type,
--- non-string keys result in error.
---
--- Note: If you want an array or hash, {expr} must return a
--- reference to it.
--- Example: >vim
---   echo perleval('[1 .. 4]')
--- <  [1, 2, 3, 4]
---
--- @param expr any
--- @return any
function vim.fn.perleval(expr) end

--- Return the power of {x} to the exponent {y} as a |Float|.
--- {x} and {y} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {x} or {y} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo pow(3, 3)
--- <  27.0 >vim
---   echo pow(2, 16)
--- <  65536.0 >vim
---   echo pow(32, 0.20)
--- <  2.0
---
--- @param x number
--- @param y number
--- @return number
function vim.fn.pow(x, y) end

--- Returns non-zero if text has been inserted after the cursor
--- because "preinsert" is present in 'completeopt', or because
--- "longest" is present in 'completeopt' while 'autocomplete'
--- is active.  Otherwise returns zero.
---
--- @return number
function vim.fn.preinserted() end

--- Return the line number of the first line at or above {lnum}
--- that is not blank.  Example: >vim
---   let ind = indent(prevnonblank(v:lnum - 1))
--- <When {lnum} is invalid or there is no non-blank line at or
--- above it, zero is returned.
--- {lnum} is used like with |getline()|.
--- Also see |nextnonblank()|.
---
--- @param lnum integer|string
--- @return integer
function vim.fn.prevnonblank(lnum) end

--- Return a String with {fmt}, where "%" items are replaced by
--- the formatted form of their respective arguments.  Example: >vim
---   echo printf("%4d: E%d %.30s", lnum, errno, msg)
--- <May result in:
---   "  99: E42 asdfasdfasdfasdfasdfasdfasdfas" ~
---
--- When used as a |method| the base is passed as the second
--- argument: >vim
---   Compute()->printf("result: %d")
--- <
--- You can use `call()` to pass the items as a list.
---
--- Often used items are:
---   %s  string
---   %6S  string right-aligned in 6 display cells
---   %6s  string right-aligned in 6 bytes
---   %.9s  string truncated to 9 bytes
---   %c  single byte
---   %d  decimal number
---   %5d  decimal number padded with spaces to 5 characters
---   %b  binary number
---   %08b  binary number padded with zeros to at least 8 characters
---   %B  binary number using upper case letters
---   %x  hex number
---   %04x  hex number padded with zeros to at least 4 characters
---   %X  hex number using upper case letters
---   %o  octal number
---   %f  floating point number as 12.23, inf, -inf or nan
---   %F  floating point number as 12.23, INF, -INF or NAN
---   %e  floating point number as 1.23e3, inf, -inf or nan
---   %E  floating point number as 1.23E3, INF, -INF or NAN
---   %g  floating point number, as %f or %e depending on value
---   %G  floating point number, as %F or %E depending on value
---   %%  the % character itself
---   %p  representation of the pointer to the container
---
--- Conversion specifications start with '%' and end with the
--- conversion type.  All other characters are copied unchanged to
--- the result.
---
--- The "%" starts a conversion specification.  The following
--- arguments appear in sequence:
---
---   % [pos-argument] [flags] [field-width] [.precision] type
---
--- pos-argument
---   At most one positional argument specifier.  These take
---   the form {n$}, where n is >= 1.
---
--- flags
---   Zero or more of the following flags:
---
---     #        The value should be converted to an "alternate
---         form".  For c, d, and s conversions, this option
---         has no effect.  For o conversions, the precision
---         of the number is increased to force the first
---         character of the output string to a zero (except
---         if a zero value is printed with an explicit
---         precision of zero).
---         For x and X conversions, a non-zero result has
---         the string "0x" (or "0X" for X conversions)
---         prepended to it.
---
---     0 (zero)  Zero padding.  For all conversions the converted
---         value is padded on the left with zeros rather
---         than blanks.  If a precision is given with a
---         numeric conversion (d, o, x, and X), the 0 flag
---         is ignored.
---
---     -        A negative field width flag; the converted value
---         is to be left adjusted on the field boundary.
---         The converted value is padded on the right with
---         blanks, rather than on the left with blanks or
---         zeros.  A - overrides a 0 if both are given.
---
---     ' ' (space)  A blank should be left before a positive
---         number produced by a signed conversion (d).
---
---     +        A sign must always be placed before a number
---         produced by a signed conversion.  A + overrides
---         a space if both are used.
---
--- field-width
---   An optional decimal digit string specifying a minimum
---   field width.  If the converted value has fewer bytes
---   than the field width, it will be padded with spaces on
---   the left (or right, if the left-adjustment flag has
---   been given) to fill out the field width.  For the S
---   conversion the count is in cells.
---
--- .precision
---   An optional precision, in the form of a period '.'
---   followed by an optional digit string.  If the digit
---   string is omitted, the precision is taken as zero.
---   This gives the minimum number of digits to appear for
---   d, o, x, and X conversions, the maximum number of
---   bytes to be printed from a string for s conversions,
---   or the maximum number of cells to be printed from a
---   string for S conversions.
---   For floating point it is the number of digits after
---   the decimal point.
---
--- type
---   A character that specifies the type of conversion to
---   be applied, see below.
---
--- A field width or precision, or both, may be indicated by an
--- asterisk "*" instead of a digit string.  In this case, a
--- Number argument supplies the field width or precision.  A
--- negative field width is treated as a left adjustment flag
--- followed by a positive field width; a negative precision is
--- treated as though it were missing.  Example: >vim
---   echo printf("%d: %.*s", nr, width, line)
--- <This limits the length of the text used from "line" to
--- "width" bytes.
---
--- If the argument to be formatted is specified using a
--- positional argument specifier, and a '*' is used to indicate
--- that a number argument is to be used to specify the width or
--- precision, the argument(s) to be used must also be specified
--- using a {n$} positional argument specifier.  See |printf-$|.
---
--- The conversion specifiers and their meanings are:
---
---     *printf-d* *printf-b* *printf-B* *printf-o* *printf-x* *printf-X*
--- dbBoxX  The Number argument is converted to signed decimal (d),
---   unsigned binary (b and B), unsigned octal (o), or
---   unsigned hexadecimal (x and X) notation.  The letters
---   "abcdef" are used for x conversions; the letters
---   "ABCDEF" are used for X conversions.  The precision, if
---   any, gives the minimum number of digits that must
---   appear; if the converted value requires fewer digits, it
---   is padded on the left with zeros.  In no case does a
---   non-existent or small field width cause truncation of a
---   numeric field; if the result of a conversion is wider
---   than the field width, the field is expanded to contain
---   the conversion result.
---   The 'h' modifier indicates the argument is 16 bits.
---   The 'l' modifier indicates the argument is a long
---   integer.  The size will be 32 bits or 64 bits
---   depending on your platform.
---   The "ll" modifier indicates the argument is 64 bits.
---   The b and B conversion specifiers never take a width
---   modifier and always assume their argument is a 64 bit
---   integer.
---   Generally, these modifiers are not useful.  They are
---   ignored when type is known from the argument.
---
--- i  alias for d
--- D  alias for ld
--- U  alias for lu
--- O  alias for lo
---
---           *printf-c*
--- c  The Number argument is converted to a byte, and the
---   resulting character is written.
---
---           *printf-s*
--- s  The text of the String argument is used.  If a
---   precision is specified, no more bytes than the number
---   specified are used.
---   If the argument is not a String type, it is
---   automatically converted to text with the same format
---   as ":echo".
---           *printf-S*
--- S  The text of the String argument is used.  If a
---   precision is specified, no more display cells than the
---   number specified are used.
---
---           *printf-f* *E807*
--- f F  The Float argument is converted into a string of the
---   form 123.456.  The precision specifies the number of
---   digits after the decimal point.  When the precision is
---   zero the decimal point is omitted.  When the precision
---   is not specified 6 is used.  A really big number
---   (out of range or dividing by zero) results in "inf"
---    or "-inf" with %f (INF or -INF with %F).
---    "0.0 / 0.0" results in "nan" with %f (NAN with %F).
---   Example: >vim
---     echo printf("%.2f", 12.115)
--- <    12.12
---   Note that roundoff depends on the system libraries.
---   Use |round()| when in doubt.
---
---           *printf-e* *printf-E*
--- e E  The Float argument is converted into a string of the
---   form 1.234e+03 or 1.234E+03 when using 'E'.  The
---   precision specifies the number of digits after the
---   decimal point, like with 'f'.
---
---           *printf-g* *printf-G*
--- g G  The Float argument is converted like with 'f' if the
---   value is between 0.001 (inclusive) and 10000000.0
---   (exclusive).  Otherwise 'e' is used for 'g' and 'E'
---   for 'G'.  When no precision is specified superfluous
---   zeroes and '+' signs are removed, except for the zero
---   immediately after the decimal point.  Thus 10000000.0
---   results in 1.0e7.
---
---           *printf-%*
--- %  A '%' is written.  No argument is converted.  The
---   complete conversion specification is "%%".
---
--- When a Number argument is expected a String argument is also
--- accepted and automatically converted.
--- When a Float or String argument is expected a Number argument
--- is also accepted and automatically converted.
--- Any other argument type results in an error message.
---
---           *E766* *E767*
--- The number of {exprN} arguments must exactly match the number
--- of "%" items.  If there are not sufficient or too many
--- arguments an error is given.  Up to 18 arguments can be used.
---
---           *printf-$*
--- In certain languages, error and informative messages are
--- more readable when the order of words is different from the
--- corresponding message in English.  To accommodate translations
--- having a different word order, positional arguments may be
--- used to indicate this.  For instance: >vim
---
---     #, c-format
---     msgid "%s returning %s"
---     msgstr "waarde %2$s komt terug van %1$s"
--- <
--- In this example, the sentence has its 2 string arguments
--- reversed in the output. >vim
---
---     echo printf(
---   "In The Netherlands, vim's creator's name is: %1$s %2$s",
---   "Bram", "Moolenaar")
--- <    In The Netherlands, vim's creator's name is: Bram Moolenaar >vim
---
---     echo printf(
---   "In Belgium, vim's creator's name is: %2$s %1$s",
---   "Bram", "Moolenaar")
--- <    In Belgium, vim's creator's name is: Moolenaar Bram
---
--- Width (and precision) can be specified using the '*'
--- specifier.  In this case, you must specify the field width
--- position in the argument list. >vim
---
---     echo printf("%1$*2$.*3$d", 1, 2, 3)
--- <    001 >vim
---     echo printf("%2$*3$.*1$d", 1, 2, 3)
--- <      2 >vim
---     echo printf("%3$*1$.*2$d", 1, 2, 3)
--- <    03 >vim
---     echo printf("%1$*2$.*3$g", 1.4142, 2, 3)
--- <    1.414
---
--- You can mix specifying the width and/or precision directly
--- and via positional arguments: >vim
---
---     echo printf("%1$4.*2$f", 1.4142135, 6)
--- <    1.414214 >vim
---     echo printf("%1$*2$.4f", 1.4142135, 6)
--- <    1.4142 >vim
---     echo printf("%1$*2$.*3$f", 1.4142135, 6, 2)
--- <      1.41
---
--- You will get an overflow error |E1510|, when the field-width
--- or precision will result in a string longer than 1 MB
--- (1024*1024 = 1048576) chars.
---
---           *E1500*
--- You cannot mix positional and non-positional arguments: >vim
---     echo printf("%s%1$s", "One", "Two")
---     " E1500: Cannot mix positional and non-positional arguments:
---     " %s%1$s
--- <
---           *E1501*
--- You cannot skip a positional argument in a format string: >vim
---     echo printf("%3$s%1$s", "One", "Two", "Three")
---     " E1501: format argument 2 unused in $-style format:
---     " %3$s%1$s
--- <
---           *E1502*
--- You can re-use a [field-width] (or [precision]) argument: >vim
---     echo printf("%1$d at width %2$d is: %1$0*2$d", 1, 2)
---     " 1 at width 2 is: 01
--- <
--- However, you can't use it as a different type: >vim
---     echo printf("%1$d at width %2$ld is: %1$0*2$d", 1, 2)
---     " E1502: Positional argument 2 used as field width reused as
---     " different type: long int/int
--- <
---           *E1503*
--- When a positional argument is used, but not the correct number
--- or arguments is given, an error is raised: >vim
---     echo printf("%1$d at width %2$d is: %1$0*2$.*3$d", 1, 2)
---     " E1503: Positional argument 3 out of bounds: %1$d at width
---     " %2$d is: %1$0*2$.*3$d
--- <
--- Only the first error is reported: >vim
---     echo printf("%1$0*2$.*3$d %4$d", 1, 2)
---     " E1503: Positional argument 3 out of bounds: %1$0*2$.*3$d
---     " %4$d
--- <
---           *E1504*
--- A positional argument can be used more than once: >vim
---     echo printf("%1$s %2$s %1$s", "One", "Two")
---     " One Two One
--- <
--- However, you can't use a different type the second time: >vim
---     echo printf("%1$s %2$s %1$d", "One", "Two")
---     " E1504: Positional argument 1 type used inconsistently:
---     " int/string
--- <
---           *E1505*
--- Various other errors that lead to a format string being
--- wrongly formatted lead to: >vim
---     echo printf("%1$d at width %2$d is: %01$*2$.3$d", 1, 2)
---     " E1505: Invalid format specifier: %1$d at width %2$d is:
---     " %01$*2$.3$d
--- <
---           *E1507*
--- This internal error indicates that the logic to parse a
--- positional format argument ran into a problem that couldn't be
--- otherwise reported.  Please file a bug against Vim if you run
--- into this, copying the exact format string and parameters that
--- were used.
---
--- @param fmt string
--- @param expr1? any
--- @return string
function vim.fn.printf(fmt, expr1) end

--- Appends text to prompt buffer before current prompt. When {text} is
--- a |List|: Append each item of the |List| as a text line above
--- prompt-line in the buffer. Any type of item is accepted and converted
--- to a String. Returns 1 for failure ({buf} not a prmopt buffer),
--- 0 for success.  When {text} is an empty list zero is returned.
---
--- Example: >vim
---   func TextEntered(text)
---     call prompt_appendbuf(bufnr(''), split('Entered: "' . a:text . '"', '\n'))
---   endfunc
---
---   set buftype=prompt
---   call prompt_setcallback(bufnr(''), function("TextEntered"))
---   eval bufnr("")->prompt_setprompt("cmd: ")
---   startinsert
--- <
---
--- @param buf integer|string
--- @param text string|string[]
--- @return 0|1
function vim.fn.prompt_appendbuf(buf, text) end

--- Gets the current user-input in |prompt-buffer| {buf} without invoking
--- prompt_callback. {buf} can be a buffer name or number.
---
--- If the buffer doesn't exist or isn't a prompt buffer, an empty
--- string is returned.
---
--- @param buf integer|string
--- @return any
function vim.fn.prompt_getinput(buf) end

--- Returns the effective prompt text for buffer {buf}.  {buf} can
--- be a buffer name or number.  See |prompt-buffer|.
---
--- If the buffer doesn't exist or isn't a prompt buffer, an empty
--- string is returned.
---
--- @param buf integer|string
--- @return any
function vim.fn.prompt_getprompt(buf) end

--- Set prompt callback for buffer {buf} to {expr}.  When {expr}
--- is an empty string the callback is removed.  This has only
--- effect if {buf} has 'buftype' set to "prompt".
---
--- The callback is invoked when pressing Enter.  The current
--- buffer will always be the prompt buffer.  A new line for a
--- prompt is added before invoking the callback, thus the prompt
--- for which the callback was invoked will be in the last but one
--- line.
--- If the callback wants to add text to the buffer, it must
--- insert it above the last line, since that is where the current
--- prompt is.  This can also be done asynchronously.
--- The callback is invoked with one argument, which is the text
--- that was entered at the prompt.  This can be an empty string
--- if the user only typed Enter.
--- Example: >vim
---    func s:TextEntered(text)
---      if a:text == 'exit' || a:text == 'quit'
---        stopinsert
---        " Reset 'modified' to allow the buffer to be closed.
---        " We assume there is nothing useful to be saved.
---        set nomodified
---        close
---      else
---        " Do something useful with "a:text".  In this example
---        " we just repeat it.
---        call append(line('$') - 1, 'Entered: "' .. a:text .. '"')
---      endif
---    endfunc
---    call prompt_setcallback(bufnr(), function('s:TextEntered'))
--- <
---
--- @param buf integer|string
--- @param expr string|function
--- @return any
function vim.fn.prompt_setcallback(buf, expr) end

--- Set a callback for buffer {buf} to {expr}.  When {expr} is an
--- empty string the callback is removed.  This has only effect if
--- {buf} has 'buftype' set to "prompt".
---
--- This callback will be invoked when pressing CTRL-C in Insert
--- mode.  Without setting a callback Vim will exit Insert mode,
--- as in any buffer.
---
--- @param buf integer|string
--- @param expr string|function
--- @return any
function vim.fn.prompt_setinterrupt(buf, expr) end

--- Set prompt for buffer {buf} to {text}.  You most likely want
--- {text} to end in a space.
--- The result is only visible if {buf} has 'buftype' set to
--- "prompt".  Example: >vim
---   call prompt_setprompt(bufnr(''), 'command: ')
--- <
---
--- @param buf integer|string
--- @param text string
--- @return any
function vim.fn.prompt_setprompt(buf, text) end

--- If the popup menu (see |ins-completion-menu|) is not visible,
--- returns an empty |Dictionary|, otherwise, returns a
--- |Dictionary| with the following keys:
---   height    nr of items visible
---   width    screen cells
---   row    top screen row (0 first row)
---   col    leftmost screen column (0 first col)
---   size    total nr of items
---   scrollbar  |TRUE| if scrollbar is visible
---
--- The values are the same as in |v:event| during |CompleteChanged|.
---
--- @return any
function vim.fn.pum_getpos() end

--- Returns non-zero when the popup menu is visible, zero
--- otherwise.  See |ins-completion-menu|.
--- This can be used to avoid some things that would remove the
--- popup menu.
---
--- @return any
function vim.fn.pumvisible() end

--- Evaluate Python expression {expr} and return its result
--- converted to Vim data structures.
--- Numbers and strings are returned as they are (strings are
--- copied though, Unicode strings are additionally converted to
--- UTF-8).
--- Lists are represented as Vim |List| type.
--- Dictionaries are represented as Vim |Dictionary| type with
--- keys converted to strings.
---
--- @param expr any
--- @return any
function vim.fn.py3eval(expr) end

--- Evaluate Python expression {expr} and return its result
--- converted to Vim data structures.
--- Numbers and strings are returned as they are (strings are
--- copied though).
--- Lists are represented as Vim |List| type.
--- Dictionaries are represented as Vim |Dictionary| type,
--- non-string keys result in error.
---
--- @param expr any
--- @return any
function vim.fn.pyeval(expr) end

--- Evaluate Python expression {expr} and return its result
--- converted to Vim data structures.
--- Uses Python 2 or 3, see |python_x| and 'pyxversion'.
--- See also: |pyeval()|, |py3eval()|
---
--- @param expr any
--- @return any
function vim.fn.pyxeval(expr) end

--- Return a pseudo-random Number generated with an xoshiro128**
--- algorithm using seed {expr}.  The returned number is 32 bits,
--- also on 64 bits systems, for consistency.
--- {expr} can be initialized by |srand()| and will be updated by
--- rand().  If {expr} is omitted, an internal seed value is used
--- and updated.
--- Returns -1 if {expr} is invalid.
---
--- Examples: >vim
---   echo rand()
---   let seed = srand()
---   echo rand(seed)
---   echo rand(seed) % 16  " random number 0 - 15
--- <
---
--- @param expr? number
--- @return any
function vim.fn.rand(expr) end

--- Returns a |List| with Numbers:
--- - If only {expr} is specified: [0, 1, ..., {expr} - 1]
--- - If {max} is specified: [{expr}, {expr} + 1, ..., {max}]
--- - If {stride} is specified: [{expr}, {expr} + {stride}, ...,
---   {max}] (increasing {expr} with {stride} each time, not
---   producing a value past {max}).
--- When the maximum is one before the start the result is an
--- empty list.  When the maximum is more than one before the
--- start this is an error.
--- Examples: >vim
---   echo range(4)    " [0, 1, 2, 3]
---   echo range(2, 4)  " [2, 3, 4]
---   echo range(2, 9, 3)  " [2, 5, 8]
---   echo range(2, -2, -1)  " [2, 1, 0, -1, -2]
---   echo range(0)    " []
---   echo range(2, 0)  " error!
--- <
---
--- @param expr any
--- @param max? integer
--- @param stride? integer
--- @return any
function vim.fn.range(expr, max, stride) end

--- Read file {fname} in binary mode and return a |Blob|.
--- If {offset} is specified, read the file from the specified
--- offset.  If it is a negative value, it is used as an offset
--- from the end of the file.  E.g., to read the last 12 bytes: >vim
---   echo readblob('file.bin', -12)
--- <If {size} is specified, only the specified size will be read.
--- E.g. to read the first 100 bytes of a file: >vim
---   echo readblob('file.bin', 0, 100)
--- <If {size} is -1 or omitted, the whole data starting from
--- {offset} will be read.
--- This can be also used to read the data from a character device
--- on Unix when {size} is explicitly set.  Only if the device
--- supports seeking {offset} can be used.  Otherwise it should be
--- zero.  E.g. to read 10 bytes from a serial console: >vim
---   echo readblob('/dev/ttyS0', 0, 10)
--- <When the file can't be opened an error message is given and
--- the result is an empty |Blob|.
--- When the offset is beyond the end of the file the result is an
--- empty blob.
--- When trying to read more bytes than are available the result
--- is truncated.
--- Also see |readfile()| and |writefile()|.
---
--- @param fname string
--- @param offset? integer
--- @param size? integer
--- @return any
function vim.fn.readblob(fname, offset, size) end

--- Return a list with file and directory names in {directory}.
--- You can also use |glob()| if you don't need to do complicated
--- things, such as limiting the number of matches.
---
--- When {expr} is omitted all entries are included.
--- When {expr} is given, it is evaluated to check what to do:
---   If {expr} results in -1 then no further entries will
---   be handled.
---   If {expr} results in 0 then this entry will not be
---   added to the list.
---   If {expr} results in 1 then this entry will be added
---   to the list.
--- Each time {expr} is evaluated |v:val| is set to the entry name.
--- When {expr} is a function the name is passed as the argument.
--- For example, to get a list of files ending in ".txt": >vim
---   echo readdir(dirname, {n -> n =~ '.txt$'})
--- <To skip hidden and backup files: >vim
---   echo readdir(dirname, {n -> n !~ '^\.\|\~$'})
---
--- <If you want to get a directory tree: >vim
---   function! s:tree(dir)
---       return {a:dir : map(readdir(a:dir),
---       \ {_, x -> isdirectory(x) ?
---       \          {x : s:tree(a:dir .. '/' .. x)} : x})}
---   endfunction
---   echo s:tree(".")
--- <
--- Returns an empty List on error.
---
--- @param directory string
--- @param expr? integer|string|fun(name: string): integer
--- @return any
function vim.fn.readdir(directory, expr) end

--- Read file {fname} and return a |List|, each line of the file
--- as an item.  Lines are broken at NL characters.  Macintosh
--- files separated with CR will result in a single long line
--- (unless a NL appears somewhere).
--- All NUL characters are replaced with a NL character.
--- When {type} contains "b" binary mode is used:
--- - When the last line ends in a NL an extra empty list item is
---   added.
--- - No CR characters are removed.
--- Otherwise:
--- - CR characters that appear before a NL are removed.
--- - Whether the last line ends in a NL or not does not matter.
--- - Any UTF-8 byte order mark is removed from the text.
--- When {max} is given this specifies the maximum number of lines
--- to be read.  Useful if you only want to check the first ten
--- lines of a file: >vim
---   for line in readfile(fname, '', 10)
---     if line =~ 'Date' | echo line | endif
---   endfor
--- <When {max} is negative -{max} lines from the end of the file
--- are returned, or as many as there are.
--- When {max} is zero the result is an empty list.
--- Note that without {max} the whole file is read into memory.
--- Also note that there is no recognition of encoding.  Read a
--- file into a buffer if you need to.
--- Deprecated (use |readblob()| instead): When {type} contains
--- "B" a |Blob| is returned with the binary data of the file
--- unmodified.
--- When the file can't be opened an error message is given and
--- the result is an empty list.
--- Also see |writefile()|.
---
--- @param fname string
--- @param type? string
--- @param max? integer
--- @return string[]
function vim.fn.readfile(fname, type, max) end

--- {func} is called for every item in {object}, which can be a
--- |String|, |List| or a |Blob|.  {func} is called with two
--- arguments: the result so far and current item.  After
--- processing all items the result is returned. *E1132*
---
--- {initial} is the initial result.  When omitted, the first item
--- in {object} is used and {func} is first called for the second
--- item.  If {initial} is not given and {object} is empty no
--- result can be computed, an E998 error is given.
---
--- Examples: >vim
---   echo reduce([1, 3, 5], { acc, val -> acc + val })
---   echo reduce(['x', 'y'], { acc, val -> acc .. val }, 'a')
---   echo reduce(0z1122, { acc, val -> 2 * acc + val })
---   echo reduce('xyz', { acc, val -> acc .. ',' .. val })
--- <
---
--- @generic T
--- @param object any
--- @param func fun(accumulator: T, current: any): any
--- @param initial? any
--- @return T
function vim.fn.reduce(object, func, initial) end

--- Returns the single letter name of the register being executed.
--- Returns an empty string when no register is being executed.
--- See |\@|.
---
--- @return any
function vim.fn.reg_executing() end

--- Returns the single letter name of the last recorded register.
--- Returns an empty string when nothing was recorded yet.
--- See |q| and |Q|.
---
--- @return any
function vim.fn.reg_recorded() end

--- Returns the single letter name of the register being recorded.
--- Returns an empty string when not recording.  See |q|.
---
--- @return any
function vim.fn.reg_recording() end

--- @return any
function vim.fn.reltime() end

--- @param start? any
--- @return any
function vim.fn.reltime(start) end

--- Return an item that represents a time value.  The item is a
--- list with items that depend on the system.
--- The item can be passed to |reltimestr()| to convert it to a
--- string or |reltimefloat()| to convert to a Float.
---
--- Without an argument it returns the current "relative time", an
--- implementation-defined value meaningful only when used as an
--- argument to |reltime()|, |reltimestr()| and |reltimefloat()|.
---
--- With one argument it returns the time passed since the time
--- specified in the argument.
--- With two arguments it returns the time passed between {start}
--- and {end}.
---
--- The {start} and {end} arguments must be values returned by
--- reltime().  Returns zero on error.
---
--- Note: |localtime()| returns the current (non-relative) time.
---
--- @param start? any
--- @param end_? any
--- @return any
function vim.fn.reltime(start, end_) end

--- Return a Float that represents the time value of {time}.
--- Unit of time is seconds.
--- Example:
---   let start = reltime()
---   call MyFunction()
---   let seconds = reltimefloat(reltime(start))
--- See the note of |reltimestr()| about overhead.
--- Also see |profiling|.
--- If there is an error an empty string is returned
---
--- @param time any
--- @return any
function vim.fn.reltimefloat(time) end

--- Return a String that represents the time value of {time}.
--- This is the number of seconds, a dot and the number of
--- microseconds.  Example: >vim
---   let start = reltime()
---   call MyFunction()
---   echo reltimestr(reltime(start))
--- <Note that overhead for the commands will be added to the time.
--- Leading spaces are used to make the string align nicely.  You
--- can use |split()| to remove it. >vim
---   echo split(reltimestr(reltime(start)))[0]
--- <Also see |profiling|.
--- If there is an error an empty string is returned
---
--- @param time any
--- @return any
function vim.fn.reltimestr(time) end

--- @param list any
--- @param idx integer
--- @return any
function vim.fn.remove(list, idx) end

--- Without {end}: Remove the item at {idx} from |List| {list} and
--- return the item.
--- With {end}: Remove items from {idx} to {end} (inclusive) and
--- return a |List| with these items.  When {idx} points to the same
--- item as {end} a list with one item is returned.  When {end}
--- points to an item before {idx} this is an error.
--- See |list-index| for possible values of {idx} and {end}.
--- Returns zero on error.
--- Example: >vim
---   echo "last item: " .. remove(mylist, -1)
---   call remove(mylist, 0, 9)
--- <
--- Use |delete()| to remove a file.
---
--- @param list any[]
--- @param idx integer
--- @param end_? integer
--- @return any
function vim.fn.remove(list, idx, end_) end

--- @param blob any
--- @param idx integer
--- @return any
function vim.fn.remove(blob, idx) end

--- Without {end}: Remove the byte at {idx} from |Blob| {blob} and
--- return the byte.
--- With {end}: Remove bytes from {idx} to {end} (inclusive) and
--- return a |Blob| with these bytes.  When {idx} points to the same
--- byte as {end} a |Blob| with one byte is returned.  When {end}
--- points to a byte before {idx} this is an error.
--- Returns zero on error.
--- Example: >vim
---   echo "last byte: " .. remove(myblob, -1)
---   call remove(mylist, 0, 9)
--- <
---
--- @param blob any
--- @param idx integer
--- @param end_? integer
--- @return any
function vim.fn.remove(blob, idx, end_) end

--- Remove the entry from {dict} with key {key} and return it.
--- Example: >vim
---   echo "removed " .. remove(dict, "one")
--- <If there is no {key} in {dict} this is an error.
--- Returns zero on error.
---
--- @param dict any
--- @param key string
--- @return any
function vim.fn.remove(dict, key) end

--- Rename the file by the name {from} to the name {to}.  This
--- should also work to move files across file systems.  The
--- result is a Number, which is 0 if the file was renamed
--- successfully, and non-zero when the renaming failed.
--- NOTE: If {to} exists it is overwritten without warning.
--- This function is not available in the |sandbox|.
---
--- @param from string
--- @param to string
--- @return integer
function vim.fn.rename(from, to) end

--- Repeat {expr} {count} times and return the concatenated
--- result.  Example: >vim
---   let separator = repeat('-', 80)
--- <When {count} is zero or negative the result is empty.
--- When {expr} is a |List| or a |Blob| the result is {expr}
--- concatenated {count} times.  Example: >vim
---   let longlist = repeat(['a', 'b'], 3)
--- <Results in ['a', 'b', 'a', 'b', 'a', 'b'].
---
--- @param expr any
--- @param count integer
--- @return any
vim.fn['repeat'] = function(expr, count) end

--- On MS-Windows, when {filename} is a shortcut (a .lnk file),
--- returns the path the shortcut points to in a simplified form.
--- On Unix, repeat resolving symbolic links in all path
--- components of {filename} and return the simplified result.
--- To cope with link cycles, resolving of symbolic links is
--- stopped after 100 iterations.
--- On other systems, return the simplified {filename}.
--- The simplification step is done as by |simplify()|.
--- resolve() keeps a leading path component specifying the
--- current directory (provided the result is still a relative
--- path name) and also keeps a trailing path separator.
---
--- @param filename string
--- @return string
function vim.fn.resolve(filename) end

--- Reverse the order of items in {object}.  {object} can be a
--- |List|, a |Blob| or a |String|.  For a List and a Blob the
--- items are reversed in-place and {object} is returned.
--- For a String a new String is returned.
--- Returns zero if {object} is not a List, Blob or a String.
--- If you want a List or Blob to remain unmodified make a copy
--- first: >vim
---   let revlist = reverse(copy(mylist))
--- <
---
--- @generic T
--- @param object T[]
--- @return T[]
function vim.fn.reverse(object) end

--- Round off {expr} to the nearest integral value and return it
--- as a |Float|.  If {expr} lies halfway between two integral
--- values, then use the larger one (away from zero).
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo round(0.456)
--- <  0.0  >vim
---   echo round(4.5)
--- <  5.0 >vim
---   echo round(-4.5)
--- <  -5.0
---
--- @param expr number
--- @return number
function vim.fn.round(expr) end

--- Sends {event} to {channel} via |RPC| and returns immediately.
--- If {channel} is 0, the event is broadcast to all channels.
--- Example: >vim
---   au VimLeave call rpcnotify(0, "leaving")
--- <
---
--- @param channel integer
--- @param event string
--- @param ... any
--- @return integer
function vim.fn.rpcnotify(channel, event, ...) end

--- Sends a request to {channel} to invoke {method} via
--- |RPC| and blocks until a response is received.
--- Example: >vim
---   let result = rpcrequest(rpc_chan, "func", 1, 2, 3)
--- <
---
--- @param channel integer
--- @param method string
--- @param ... any
--- @return any
function vim.fn.rpcrequest(channel, method, ...) end

--- @deprecated
--- Deprecated. Replace  >vim
---   let id = rpcstart('prog', ['arg1', 'arg2'])
--- <with >vim
---   let id = jobstart(['prog', 'arg1', 'arg2'], {'rpc': v:true})
--- <
---
--- @param prog string
--- @param argv? any
--- @return any
function vim.fn.rpcstart(prog, argv) end

--- @deprecated
--- Use |jobstop()| instead to stop any job, or
--- `chanclose(id, "rpc")` to close RPC communication
--- without stopping the job. Use chanclose(id) to close
--- any socket.
---
--- @param ... any
--- @return any
function vim.fn.rpcstop(...) end

--- Evaluate Ruby expression {expr} and return its result
--- converted to Vim data structures.
--- Numbers, floats and strings are returned as they are (strings
--- are copied though).
--- Arrays are represented as Vim |List| type.
--- Hashes are represented as Vim |Dictionary| type.
--- Other objects are represented as strings resulted from their
--- "Object#to_s" method.
---
--- @param expr any
--- @return any
function vim.fn.rubyeval(expr) end

--- Like |screenchar()|, but return the attribute.  This is a rather
--- arbitrary number that can only be used to compare to the
--- attribute at other positions.
--- Returns -1 when row or col is out of range.
---
--- @param row integer
--- @param col integer
--- @return integer
function vim.fn.screenattr(row, col) end

--- Returns the character at screen position [row, col] as a
--- Number.  This works for every possible screen position, also
--- status lines, window separators and the command line.  The
--- top left position is row one, column one.  The character
--- excludes composing characters.  For double-byte
--- encodings it may only be the first byte.
--- This is mainly to be used for testing.
--- Returns -1 when row or col is out of range.
---
--- @param row integer
--- @param col integer
--- @return integer
function vim.fn.screenchar(row, col) end

--- Returns the character and any composing characters at screen
--- position [row, col] as a |List| of Numbers.  The first number
--- is the same as what |screenchar()| returns; further numbers
--- are composing characters on top of the base character.
--- This is mainly to be used for testing.
--- Returns an empty List when row or col is out of range.
---
--- @param row integer
--- @param col integer
--- @return integer[]
function vim.fn.screenchars(row, col) end

--- Returns the current screen column of the cursor.  The
--- leftmost column has number 1.
--- This function is mainly used for testing.
---
--- Note: Always returns the current screen column, thus if used
--- in a command (e.g. ":echo screencol()") it will return the
--- column inside the command line, which is 1 when the command is
--- executed.  To get the cursor position in the file use one of
--- the following mappings: >vim
---   nnoremap <expr> GG ":echom " .. screencol() .. "\n"
---   nnoremap <silent> GG :echom screencol()<CR>
---   noremap GG <Cmd>echom screencol()<CR>
--- <
---
--- @return integer
function vim.fn.screencol() end

--- Returns the screen position of the text character in window
--- {winid} at buffer line {lnum} and column {col} as a Dict.
--- {col} is a one-based byte index.
--- The Dict has these members:
---   row  screen row
---   col  first screen column
---   endcol  last screen column
---   curscol  cursor screen column
--- If the specified position is not visible, all values are zero.
--- The "endcol" value differs from "col" when the character
--- occupies more than one screen cell.  E.g. for a Tab "col" can
--- be 1 and "endcol" can be 8.
--- The "curscol" value is where the cursor would be placed.  For
--- a Tab it would be the same as "endcol", while for a double
--- width character it would be the same as "col".
--- The |conceal| feature is ignored here, the column numbers are
--- as if 'conceallevel' is zero.  You can set the cursor to the
--- right position and use |screencol()| to get the value with
--- |conceal| taken into account.
--- If the position is in a closed fold the screen position of the
--- first character is returned, {col} is not used.
--- Returns an empty Dict if {winid} is invalid.
---
--- @param winid integer
--- @param lnum integer
--- @param col integer
--- @return { col: integer, curscol: integer, endcol: integer, row: integer }
function vim.fn.screenpos(winid, lnum, col) end

--- Returns the current screen row of the cursor.  The top line
--- has number one.
--- This function is mainly used for testing.
--- Alternatively you can use |winline()|.
---
--- Note: Same restrictions as with |screencol()|.
---
--- @return integer
function vim.fn.screenrow() end

--- Returns the base character and any composing characters at
--- screen position [row, col] as a String.  This is like
--- |screenchars()| but returning a String with the characters.
--- This is mainly to be used for testing.
--- Returns an empty String when row or col is out of range.
---
--- @param row integer
--- @param col integer
--- @return string
function vim.fn.screenstring(row, col) end

--- Search for regexp pattern {pattern}.  The search starts at the
--- cursor position (you can use |cursor()| to set it).
---
--- When a match has been found its line number is returned.
--- If there is no match a 0 is returned and the cursor doesn't
--- move.  No error message is given.
--- To get the matched string, use |matchbufline()|.
---
--- {flags} is a String, which can contain these character flags:
--- 'b'  search Backward instead of forward
--- 'c'  accept a match at the Cursor position
--- 'e'  move to the End of the match
--- 'n'  do Not move the cursor
--- 'p'  return number of matching sub-Pattern (see below)
--- 's'  Set the ' mark at the previous location of the cursor
--- 'w'  Wrap around the end of the file
--- 'W'  don't Wrap around the end of the file
--- 'z'  start searching at the cursor column instead of Zero
--- If neither 'w' or 'W' is given, the 'wrapscan' option applies.
---
--- If the 's' flag is supplied, the ' mark is set, only if the
--- cursor is moved.  The 's' flag cannot be combined with the 'n'
--- flag.
---
--- 'ignorecase', 'smartcase' and 'magic' are used.
---
--- When the 'z' flag is not given, forward searching always
--- starts in column zero and then matches before the cursor are
--- skipped.  When the 'c' flag is present in 'cpo' the next
--- search starts after the match.  Without the 'c' flag the next
--- search starts one column after the start of the match.  This
--- matters for overlapping matches.  See |cpo-c|.  You can also
--- insert "\ze" to change where the match ends, see  |/\ze|.
---
--- When searching backwards and the 'z' flag is given then the
--- search starts in column zero, thus no match in the current
--- line will be found (unless wrapping around the end of the
--- file).
---
--- When the {stopline} argument is given then the search stops
--- after searching this line.  This is useful to restrict the
--- search to a range of lines.  Examples: >vim
---   let match = search('(', 'b', line("w0"))
---   let end = search('END', '', line("w$"))
--- <When {stopline} is used and it is not zero this also implies
--- that the search does not wrap around the end of the file.
--- A zero value is equal to not giving the argument.
---
--- When the {timeout} argument is given the search stops when
--- more than this many milliseconds have passed.  Thus when
--- {timeout} is 500 the search stops after half a second.
--- The value must not be negative.  A zero value is like not
--- giving the argument.
---
--- Note: the timeout is only considered when searching, not
--- while evaluating the {skip} expression.
---
--- If the {skip} expression is given it is evaluated with the
--- cursor positioned on the start of a match.  If it evaluates to
--- non-zero this match is skipped.  This can be used, for
--- example, to skip a match in a comment or a string.
--- {skip} can be a string, which is evaluated as an expression, a
--- function reference or a lambda.
--- When {skip} is omitted or empty, every match is accepted.
--- When evaluating {skip} causes an error the search is aborted
--- and -1 returned.
---           *search()-sub-match*
--- With the 'p' flag the returned value is one more than the
--- first sub-match in \(\).  One if none of them matched but the
--- whole pattern did match.
--- To get the column number too use |searchpos()|.
---
--- The cursor will be positioned at the match, unless the 'n'
--- flag is used.
---
--- Example (goes over all files in the argument list): >vim
---     let n = 1
---     while n <= argc()      " loop over all files in arglist
---       exe "argument " .. n
---       " start at the last char in the file and wrap for the
---       " first search to find match at start of file
---       normal G$
---       let flags = "w"
---       while search("foo", flags) > 0
---         s/foo/bar/g
---         let flags = "W"
---       endwhile
---       update        " write the file if modified
---       let n = n + 1
---     endwhile
--- <
--- Example for using some flags: >vim
---     echo search('\<if\|\(else\)\|\(endif\)', 'ncpe')
--- <This will search for the keywords "if", "else", and "endif"
--- under or after the cursor.  Because of the 'p' flag, it
--- returns 1, 2, or 3 depending on which keyword is found, or 0
--- if the search fails.  With the cursor on the first word of the
--- line:
---     if (foo == 0) | let foo = foo + 1 | endif ~
--- the function returns 1.  Without the 'c' flag, the function
--- finds the "endif" and returns 3.  The same thing happens
--- without the 'e' flag if the cursor is on the "f" of "if".
--- The 'n' flag tells the function not to move the cursor.
---
--- @param pattern string
--- @param flags? string
--- @param stopline? integer
--- @param timeout? integer
--- @param skip? string|function
--- @return integer
function vim.fn.search(pattern, flags, stopline, timeout, skip) end

--- Get or update the last search count, like what is displayed
--- without the "S" flag in 'shortmess'.  This works even if
--- 'shortmess' does contain the "S" flag.
---
--- This returns a |Dictionary|.  The dictionary is empty if the
--- previous pattern was not set and "pattern" was not specified.
---
---   key    type    meaning ~
---   current  |Number|  current position of match;
---         0 if the cursor position is
---         before the first match
---   exact_match  |Boolean|  1 if "current" is matched on
---         "pos", otherwise 0
---   total    |Number|  total count of matches found
---   incomplete  |Number|  0: search was fully completed
---         1: recomputing was timed out
---         2: max count exceeded
---
--- For {options} see further down.
---
--- To get the last search count when |n| or |N| was pressed, call
--- this function with `recompute: 0` .  This sometimes returns
--- wrong information because of 'maxsearchcount'.
--- If the count exceeded 'maxsearchcount', the result must be
--- 'maxsearchcount' + 1.  If you want to get correct information,
--- specify `recompute: 1`: >vim
---
---   " result == 'maxsearchcount' + 1 when many matches
---   let result = searchcount(#{recompute: 0})
---
---   " Below returns correct result (recompute defaults
---   " to 1)
---   let result = searchcount()
--- <
--- The function is useful to add the count to 'statusline': >vim
---   function! LastSearchCount() abort
---     let result = searchcount(#{recompute: 0})
---     if empty(result)
---       return ''
---     endif
---     if result.incomplete ==# 1     " timed out
---       return printf(' /%s [?/??]', \@/)
---     elseif result.incomplete ==# 2 " max count exceeded
---       if result.total > result.maxcount &&
---       \  result.current > result.maxcount
---         return printf(' /%s [>%d/>%d]', \@/,
---         \             result.current, result.total)
---       elseif result.total > result.maxcount
---         return printf(' /%s [%d/>%d]', \@/,
---         \             result.current, result.total)
---       endif
---     endif
---     return printf(' /%s [%d/%d]', \@/,
---     \             result.current, result.total)
---   endfunction
---   let &statusline ..= '%{LastSearchCount()}'
---
---   " Or if you want to show the count only when
---   " 'hlsearch' was on
---   " let &statusline ..=
---   " \   '%{v:hlsearch ? LastSearchCount() : ""}'
--- <
--- You can also update the search count, which can be useful in a
--- |CursorMoved| or |CursorMovedI| autocommand: >vim
---
---   autocmd CursorMoved,CursorMovedI *
---     \ let s:searchcount_timer = timer_start(
---     \   200, function('s:update_searchcount'))
---   function! s:update_searchcount(timer) abort
---     if a:timer ==# s:searchcount_timer
---       call searchcount(#{
---       \ recompute: 1, maxcount: 0, timeout: 100})
---       redrawstatus
---     endif
---   endfunction
--- <
--- This can also be used to count matched texts with specified
--- pattern in the current buffer using "pattern":  >vim
---
---   " Count '\<foo\>' in this buffer
---   " (Note that it also updates search count)
---   let result = searchcount(#{pattern: '\<foo\>'})
---
---   " To restore old search count by old pattern,
---   " search again
---   call searchcount()
--- <
--- {options} must be a |Dictionary|.  It can contain:
---   key    type    meaning ~
---   recompute  |Boolean|  if |TRUE|, recompute the count
---         like |n| or |N| was executed.
---         otherwise returns the last
---         computed result (when |n| or
---         |N| was used when "S" is not
---         in 'shortmess', or this
---         function was called).
---         (default: |TRUE|)
---   pattern  |String|  recompute if this was given
---         and different with |\@/|.
---         this works as same as the
---         below command is executed
---         before calling this function >vim
---           let \@/ = pattern
--- <        (default: |\@/|)
---   timeout  |Number|  0 or negative number is no
---         timeout. timeout milliseconds
---         for recomputing the result
---         (default: 0)
---   maxcount  |Number|  0 or negative number is no
---         limit. max count of matched
---         text while recomputing the
---         result.  if search exceeded
---         total count, "total" value
---         becomes `maxcount + 1`
---         (default: 'maxsearchcount')
---   pos    |List|    `[lnum, col, off]` value
---         when recomputing the result.
---         this changes "current" result
---         value. see |cursor()|, |getpos()|
---         (default: cursor's position)
---
--- @param options? table
--- @return any
function vim.fn.searchcount(options) end

--- Search for the declaration of {name}.
---
--- With a non-zero {global} argument it works like |gD|, find
--- first match in the file.  Otherwise it works like |gd|, find
--- first match in the function.
---
--- With a non-zero {thisblock} argument matches in a {} block
--- that ends before the cursor position are ignored.  Avoids
--- finding variable declarations only valid in another scope.
---
--- Moves the cursor to the found match.
--- Returns zero for success, non-zero for failure.
--- Example: >vim
---   if searchdecl('myvar') == 0
---      echo getline('.')
---   endif
--- <
---
--- @param name string
--- @param global? boolean
--- @param thisblock? boolean
--- @return any
function vim.fn.searchdecl(name, global, thisblock) end

--- Search for the match of a nested start-end pair.  This can be
--- used to find the "endif" that matches an "if", while other
--- if/endif pairs in between are ignored.
--- The search starts at the cursor.  The default is to search
--- forward, include 'b' in {flags} to search backward.
--- If a match is found, the cursor is positioned at it and the
--- line number is returned.  If no match is found 0 or -1 is
--- returned and the cursor doesn't move.  No error message is
--- given.
---
--- {start}, {middle} and {end} are patterns, see |pattern|.  They
--- must not contain \( \) pairs.  Use of \%( \) is allowed.  When
--- {middle} is not empty, it is found when searching from either
--- direction, but only when not in a nested start-end pair.  A
--- typical use is: >vim
---   echo searchpair('\<if\>', '\<else\>', '\<endif\>')
--- <By leaving {middle} empty the "else" is skipped.
---
--- {flags} 'b', 'c', 'n', 's', 'w' and 'W' are used like with
--- |search()|.  Additionally:
--- 'r'  Repeat until no more matches found; will find the
---   outer pair.  Implies the 'W' flag.
--- 'm'  Return number of matches instead of line number with
---   the match; will be > 1 when 'r' is used.
--- Note: it's nearly always a good idea to use the 'W' flag, to
--- avoid wrapping around the end of the file.
---
--- When a match for {start}, {middle} or {end} is found, the
--- {skip} expression is evaluated with the cursor positioned on
--- the start of the match.  It should return non-zero if this
--- match is to be skipped.  E.g., because it is inside a comment
--- or a string.
--- When {skip} is omitted or empty, every match is accepted.
--- When evaluating {skip} causes an error the search is aborted
--- and -1 returned.
--- {skip} can be a string, a lambda, a funcref or a partial.
--- Anything else makes the function fail.
---
--- For {stopline} and {timeout} see |search()|.
---
--- The value of 'ignorecase' is used.  'magic' is ignored, the
--- patterns are used like it's on.
---
--- The search starts exactly at the cursor.  A match with
--- {start}, {middle} or {end} at the next character, in the
--- direction of searching, is the first one found.  Example: >vim
---   if 1
---     if 2
---     endif 2
---   endif 1
--- <When starting at the "if 2", with the cursor on the "i", and
--- searching forwards, the "endif 2" is found.  When starting on
--- the character just before the "if 2", the "endif 1" will be
--- found.  That's because the "if 2" will be found first, and
--- then this is considered to be a nested if/endif from "if 2" to
--- "endif 2".
--- When searching backwards and {end} is more than one character,
--- it may be useful to put "\zs" at the end of the pattern, so
--- that when the cursor is inside a match with the end it finds
--- the matching start.
---
--- Example, to find the "endif" command in a Vim script: >vim
---
---   echo searchpair('\<if\>', '\<el\%[seif]\>', '\<en\%[dif]\>', 'W',
---   \ 'getline(".") =~ "^\\s*\""')
---
--- <The cursor must be at or after the "if" for which a match is
--- to be found.  Note that single-quote strings are used to avoid
--- having to double the backslashes.  The skip expression only
--- catches comments at the start of a line, not after a command.
--- Also, a word "en" or "if" halfway through a line is considered
--- a match.
--- Another example, to search for the matching "{" of a "}": >vim
---
---   echo searchpair('{', '', '}', 'bW')
---
--- <This works when the cursor is at or before the "}" for which a
--- match is to be found.  To reject matches that syntax
--- highlighting recognized as strings: >vim
---
---   echo searchpair('{', '', '}', 'bW',
---        \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"')
--- <
---
--- @param start string
--- @param middle string
--- @param end_ string
--- @param flags? string
--- @param skip? string|function
--- @param stopline? integer
--- @param timeout? integer
--- @return integer
function vim.fn.searchpair(start, middle, end_, flags, skip, stopline, timeout) end

--- Same as |searchpair()|, but returns a |List| with the line and
--- column position of the match.  The first element of the |List|
--- is the line number and the second element is the byte index of
--- the column position of the match.  If no match is found,
--- returns [0, 0]. >vim
---
---   let [lnum,col] = searchpairpos('{', '', '}', 'n')
--- <
--- See |match-parens| for a bigger and more useful example.
---
--- @param start string
--- @param middle string
--- @param end_ string
--- @param flags? string
--- @param skip? string|function
--- @param stopline? integer
--- @param timeout? integer
--- @return [integer, integer]
function vim.fn.searchpairpos(start, middle, end_, flags, skip, stopline, timeout) end

--- Same as |search()|, but returns a |List| with the line and
--- column position of the match.  The first element of the |List|
--- is the line number and the second element is the byte index of
--- the column position of the match.  If no match is found,
--- returns [0, 0].
--- Example: >vim
---   let [lnum, col] = searchpos('mypattern', 'n')
---
--- <When the 'p' flag is given then there is an extra item with
--- the sub-pattern match number |search()-sub-match|.  Example: >vim
---   let [lnum, col, submatch] = searchpos('\(\l\)\|\(\u\)', 'np')
--- <In this example "submatch" is 2 when a lowercase letter is
--- found |/\l|, 3 when an uppercase letter is found |/\u|.
---
--- @param pattern string
--- @param flags? string
--- @param stopline? integer
--- @param timeout? integer
--- @param skip? string|function
--- @return { [1]: integer, [2]: integer, [3]: integer? }
function vim.fn.searchpos(pattern, flags, stopline, timeout, skip) end

--- Returns a list of server addresses, or empty if all servers
--- were stopped. |serverstart()| |serverstop()|
---
--- The optional argument {opts} is a Dict and supports the following items:
---
---   peer  : If |TRUE|, servers not started by |serverstart()|
---           will also be returned. (default: |FALSE|)
---           Not supported on Windows yet.
---
--- Example: >vim
---   echo serverlist()
--- <
---
--- @param opts? table
--- @return string[]
function vim.fn.serverlist(opts) end

--- Opens a socket or named pipe at {address} and listens for
--- |RPC| messages. Clients can send |API| commands to the
--- returned address to control Nvim.
---
--- Returns the address string (which may differ from the
--- {address} argument, see below).
---
--- - If {address} has a colon (":") it is a TCP/IPv4/IPv6 address
---   where the last ":" separates host and port (empty or zero
---   assigns a random port).
--- - Else {address} is the path to a named pipe (except on Windows).
---   - If {address} has no slashes ("/") it is treated as the
---     "name" part of a generated path in this format: >vim
---   stdpath("run").."/{name}.{pid}.{counter}"
--- <  - If {address} is omitted the name is "nvim". >vim
---   echo serverstart()
--- < >
---   => /tmp/nvim.bram/oknANW/nvim.15430.5
--- <
--- Example bash command to list all Nvim servers: >bash
---   ls ${XDG_RUNTIME_DIR:-${TMPDIR}nvim.${USER}}/*/nvim.*.0
---
--- <Example named pipe: >vim
---   if has('win32')
---     echo serverstart('\\.\pipe\nvim-pipe-1234')
---   else
---     echo serverstart('nvim.sock')
---   endif
--- <
--- Example TCP/IP address: >vim
---   echo serverstart('::1:12345')
--- <
---
--- @param address? string
--- @return string
function vim.fn.serverstart(address) end

--- Closes the pipe or socket at {address}.
--- Returns TRUE if {address} is valid, else FALSE.
--- If |v:servername| is stopped it is set to the next available
--- address in |serverlist()|.
---
--- @param address string
--- @return integer
function vim.fn.serverstop(address) end

--- Set line {lnum} to {text} in buffer {buf}.  This works like
--- |setline()| for the specified buffer.
---
--- This function works only for loaded buffers.  First call
--- |bufload()| if needed.
---
--- To insert lines use |appendbufline()|.
---
--- {text} can be a string to set one line, or a List of strings
--- to set multiple lines.  If the List extends below the last
--- line then those lines are added.  If the List is empty then
--- nothing is changed and zero is returned.
---
--- For the use of {buf}, see |bufname()| above.
---
--- {lnum} is used like with |setline()|.
--- Use "$" to refer to the last line in buffer {buf}.
--- When {lnum} is just below the last line the {text} will be
--- added below the last line.
--- On success 0 is returned, on failure 1 is returned.
---
--- If {buf} is not a valid buffer or {lnum} is not valid, an
--- error message is given.
---
--- @param buf integer|string
--- @param lnum integer
--- @param text string|string[]
--- @return integer
function vim.fn.setbufline(buf, lnum, text) end

--- Set option or local variable {varname} in buffer {buf} to
--- {val}.
--- This also works for a global or local window option, but it
--- doesn't work for a global or local window variable.
--- For a local window option the global value is unchanged.
--- For the use of {buf}, see |bufname()| above.
--- The {varname} argument is a string.
--- Note that the variable name without "b:" must be used.
--- Examples: >vim
---   call setbufvar(1, "&mod", 1)
---   call setbufvar("todo", "myvar", "foobar")
--- <This function is not available in the |sandbox|.
---
--- @param buf integer|string
--- @param varname string
--- @param val any
--- @return any
function vim.fn.setbufvar(buf, varname, val) end

--- Specify overrides for cell widths of character ranges.  This
--- tells Vim how wide characters are when displayed in the
--- terminal, counted in screen cells.  The values override
--- 'ambiwidth'.  Example: >vim
---    call setcellwidths([
---     \ [0x111, 0x111, 1],
---     \ [0x2194, 0x2199, 2],
---     \ ])
---
--- <The {list} argument is a List of Lists with each three
--- numbers: [{low}, {high}, {width}].  *E1109* *E1110*
--- {low} and {high} can be the same, in which case this refers to
--- one character.  Otherwise it is the range of characters from
--- {low} to {high} (inclusive).    *E1111* *E1114*
--- Only characters with value 0x80 and higher can be used.
---
--- {width} must be either 1 or 2, indicating the character width
--- in screen cells.      *E1112*
--- An error is given if the argument is invalid, also when a
--- range overlaps with another.    *E1113*
---
--- If the new value causes 'fillchars' or 'listchars' to become
--- invalid it is rejected and an error is given.
---
--- To clear the overrides pass an empty {list}: >vim
---    call setcellwidths([])
---
--- <You can use the script $VIMRUNTIME/scripts/emoji_list.lua to see
--- the effect for known emoji characters.  Move the cursor
--- through the text to check if the cell widths of your terminal
--- match with what Vim knows about each emoji.  If it doesn't
--- look right you need to adjust the {list} argument.
---
--- @param list any[]
--- @return any
function vim.fn.setcellwidths(list) end

--- Same as |setpos()| but uses the specified column number as the
--- character index instead of the byte index in the line.
---
--- Example:
--- With the text "여보세요" in line 8: >vim
---   call setcharpos('.', [0, 8, 4, 0])
--- <positions the cursor on the fourth character '요'. >vim
---   call setpos('.', [0, 8, 4, 0])
--- <positions the cursor on the second character '보'.
---
--- @param expr string
--- @param list integer[]
--- @return any
function vim.fn.setcharpos(expr, list) end

--- Set the current character search information to {dict},
--- which contains one or more of the following entries:
---
---     char  character which will be used for a subsequent
---     |,| or |;| command; an empty string clears the
---     character search
---     forward  direction of character search; 1 for forward,
---     0 for backward
---     until  type of character search; 1 for a |t| or |T|
---     character search, 0 for an |f| or |F|
---     character search
---
--- This can be useful to save/restore a user's character search
--- from a script: >vim
---   let prevsearch = getcharsearch()
---   " Perform a command which clobbers user's search
---   call setcharsearch(prevsearch)
--- <Also see |getcharsearch()|.
---
--- @param dict { char?: string, forward?: 1|0, until?: 1|0 }
--- @return any
function vim.fn.setcharsearch(dict) end

--- Set the command line to {str} and set the cursor position to
--- {pos}.
--- If {pos} is omitted, the cursor is positioned after the text.
--- Returns 0 when successful, 1 when not editing the command
--- line.
---
--- @param str string
--- @param pos? integer
--- @return integer
function vim.fn.setcmdline(str, pos) end

--- Set the cursor position in the command line to byte position
--- {pos}.  The first position is 1.
--- Use |getcmdpos()| to obtain the current position.
--- Only works while editing the command line, thus you must use
--- |c_CTRL-\_e|, |c_CTRL-R_=| or |c_CTRL-R_CTRL-R| with '='.  For
--- |c_CTRL-\_e| and |c_CTRL-R_CTRL-R| with '=' the position is
--- set after the command line is set to the expression.  For
--- |c_CTRL-R_=| it is set after evaluating the expression but
--- before inserting the resulting text.
--- When the number is too big the cursor is put at the end of the
--- line.  A number smaller than one has undefined results.
--- Returns 0 when successful, 1 when not editing the command
--- line.
---
--- @param pos integer
--- @return any
function vim.fn.setcmdpos(pos) end

--- @param lnum integer|string
--- @param col? integer
--- @param off? integer
--- @return any
function vim.fn.setcursorcharpos(lnum, col, off) end

--- Same as |cursor()| but uses the specified column number as the
--- character index instead of the byte index in the line.
---
--- Example:
--- With the text "여보세요" in line 4: >vim
---   call setcursorcharpos(4, 3)
--- <positions the cursor on the third character '세'. >vim
---   call cursor(4, 3)
--- <positions the cursor on the first character '여'.
---
--- Returns 0 when the position could be set, -1 otherwise.
---
--- @param list integer[]
--- @return any
function vim.fn.setcursorcharpos(list) end

--- Set environment variable {name} to {val}.  Example: >vim
---   call setenv('HOME', '/home/myhome')
---
--- <When {val} is |v:null| the environment variable is deleted.
--- See also |expr-env|.
---
--- @param name string
--- @param val string
--- @return any
function vim.fn.setenv(name, val) end

--- Set the file permissions for {fname} to {mode}.
--- {mode} must be a string with 9 characters.  It is of the form
--- "rwxrwxrwx", where each group of "rwx" flags represent, in
--- turn, the permissions of the owner of the file, the group the
--- file belongs to, and other users.  A '-' character means the
--- permission is off, any other character means on.  Multi-byte
--- characters are not supported.
---
--- For example "rw-r-----" means read-write for the user,
--- readable by the group, not accessible by others.  "xx-x-----"
--- would do the same thing.
---
--- Returns non-zero for success, zero for failure.
---
--- To read permissions see |getfperm()|.
---
--- @param fname string
--- @param mode string
--- @return any
function vim.fn.setfperm(fname, mode) end

--- Set line {lnum} of the current buffer to {text}.  To insert
--- lines use |append()|.  To set lines in another buffer use
--- |setbufline()|.
---
--- {lnum} is used like with |getline()|.
--- When {lnum} is just below the last line the {text} will be
--- added below the last line.
--- {text} can be any type or a List of any type, each item is
--- converted to a String.  When {text} is an empty List then
--- nothing is changed and FALSE is returned.
---
--- If this succeeds, FALSE is returned.  If this fails (most
--- likely because {lnum} is invalid) TRUE is returned.
---
--- Example: >vim
---   call setline(5, strftime("%c"))
---
--- <When {text} is a |List| then line {lnum} and following lines
--- will be set to the items in the list.  Example: >vim
---   call setline(5, ['aaa', 'bbb', 'ccc'])
--- <This is equivalent to: >vim
---   for [n, l] in [[5, 'aaa'], [6, 'bbb'], [7, 'ccc']]
---     call setline(n, l)
---   endfor
---
--- <Note: The '[ and '] marks are not set.
---
--- @param lnum integer|string
--- @param text any
--- @return any
function vim.fn.setline(lnum, text) end

--- Create or replace or add to the location list for window {nr}.
--- {nr} can be the window number or the |window-ID|.
--- When {nr} is zero the current window is used.
---
--- For a location list window, the displayed location list is
--- modified.  For an invalid window number {nr}, -1 is returned.
--- Otherwise, same as |setqflist()|.
--- Also see |location-list|.
---
--- For {action} see |setqflist-action|.
---
--- If the optional {what} dictionary argument is supplied, then
--- only the items listed in {what} are set.  Refer to |setqflist()|
--- for the list of supported keys in {what}.
---
--- @param nr integer
--- @param list vim.quickfix.entry[]
--- @param action? string
--- @param what? vim.fn.setqflist.what
--- @return any
function vim.fn.setloclist(nr, list, action, what) end

--- Restores a list of matches saved by |getmatches()| for the
--- current window.  Returns 0 if successful, otherwise -1.  All
--- current matches are cleared before the list is restored.  See
--- example for |getmatches()|.
--- If {win} is specified, use the window with this number or
--- window ID instead of the current window.
---
--- @param list vim.fn.getmatches.ret.item[]
--- @param win? integer
--- @return any
function vim.fn.setmatches(list, win) end

--- Set the position for String {expr}.  Possible values:
---   .  the cursor
---   'x  mark x
---
--- {list} must be a |List| with four or five numbers:
---     [bufnum, lnum, col, off]
---     [bufnum, lnum, col, off, curswant]
---
--- "bufnum" is the buffer number.  Zero can be used for the
--- current buffer.  When setting an uppercase mark "bufnum" is
--- used for the mark position.  For other marks it specifies the
--- buffer to set the mark in.  You can use the |bufnr()| function
--- to turn a file name into a buffer number.
--- For setting the cursor and the ' mark "bufnum" is ignored,
--- since these are associated with a window, not a buffer.
--- Does not change the jumplist.
---
--- "lnum" and "col" are the position in the buffer.  The first
--- column is 1.  Use a zero "lnum" to delete a mark.  If "col" is
--- smaller than 1 then 1 is used.  To use the character count
--- instead of the byte count, use |setcharpos()|.
---
--- The "off" number is only used when 'virtualedit' is set.  Then
--- it is the offset in screen columns from the start of the
--- character.  E.g., a position within a <Tab> or after the last
--- character.
---
--- The "curswant" number is only used when setting the cursor
--- position.  It sets the preferred column for when moving the
--- cursor vertically.  When the "curswant" number is missing the
--- preferred column is not set.  When it is present and setting a
--- mark position it is not used.
---
--- Note that for |'<| and |'>| changing the line number may
--- result in the marks to be effectively swapped, so that |'<| is
--- always before |'>|.
---
--- The visual marks |'<| and |'>| refer to the beginning and end
--- of the visual selection relative to the cursor position.
--- Note that this differs from |getpos()|, where they are
--- relative to the buffer.
---
--- Returns 0 when the position could be set, -1 otherwise.
--- An error message is given if {expr} is invalid.
---
--- Also see |setcharpos()|, |getpos()| and |getcurpos()|.
---
--- This does not restore the preferred column for moving
--- vertically; if you set the cursor position with this, |j| and
--- |k| motions will jump to previous columns!  Use |cursor()| to
--- also set the preferred column.  Also see the "curswant" key in
--- |winrestview()|.
---
--- @param expr string
--- @param list integer[]
--- @return any
function vim.fn.setpos(expr, list) end

--- Create or replace or add to the quickfix list.
---
--- If the optional {what} dictionary argument is supplied, then
--- only the items listed in {what} are set.  The first {list}
--- argument is ignored.  See below for the supported items in
--- {what}.
---           *setqflist-what*
--- When {what} is not present, the items in {list} are used.
--- Each item must be a dictionary.  Non-dictionary items in
--- {list} are ignored.  Each dictionary item can contain the
--- following entries:
---
---     bufnr  buffer number; must be the number of a valid
---     buffer
---     filename  name of a file; only used when "bufnr" is not
---     present or it is invalid.
---     module  name of a module; if given it will be used in
---     quickfix error window instead of the filename.
---     lnum  line number in the file
---     end_lnum  end of lines, if the item spans multiple lines
---     pattern  search pattern used to locate the error
---     col    column number
---     vcol  when non-zero: "col" is visual column
---     when zero: "col" is byte index
---     end_col  end column, if the item spans multiple columns
---     nr    error number
---     text  description of the error
---     type  single-character error type, 'E', 'W', etc.
---     valid  recognized error message
---     user_data
---     custom data associated with the item, can be
---     any type.
---
--- The "col", "vcol", "nr", "type" and "text" entries are
--- optional.  Either "lnum" or "pattern" entry can be used to
--- locate a matching error line.
--- If the "filename" and "bufnr" entries are not present or
--- neither the "lnum" or "pattern" entries are present, then the
--- item will not be handled as an error line.
--- If both "pattern" and "lnum" are present then "pattern" will
--- be used.
--- If the "valid" entry is not supplied, then the valid flag is
--- set when "bufnr" is a valid buffer or "filename" exists.
--- If you supply an empty {list}, the quickfix list will be
--- cleared.
--- Note that the list is not exactly the same as what
--- |getqflist()| returns.
---
--- {action} values:    *setqflist-action* *E927*
--- 'a'  The items from {list} are added to the existing
---   quickfix list.  If there is no existing list, then a
---   new list is created.
---
--- 'r'  The items from the current quickfix list are replaced
---   with the items from {list}.  This can also be used to
---   clear the list: >vim
---     call setqflist([], 'r')
--- <
--- 'u'  Like 'r', but tries to preserve the current selection
---   in the quickfix list.
--- 'f'  All the quickfix lists in the quickfix stack are
---   freed.
---
--- If {action} is not present or is set to ' ', then a new list
--- is created.  The new quickfix list is added after the current
--- quickfix list in the stack and all the following lists are
--- freed.  To add a new quickfix list at the end of the stack,
--- set "nr" in {what} to "$".
---
--- The following items can be specified in dictionary {what}:
---     context  quickfix list context.  See |quickfix-context|
---     efm    errorformat to use when parsing text from
---     "lines".  If this is not present, then the
---     'errorformat' option value is used.
---     See |quickfix-parse|
---     id    quickfix list identifier |quickfix-ID|
---     idx    index of the current entry in the quickfix
---     list specified by "id" or "nr".  If set to
---     '$', then the last entry in the list is set as
---     the current entry.  See |quickfix-index|
---     items  list of quickfix entries.  Same as the {list}
---     argument.
---     lines  use 'errorformat' to parse a list of lines and
---     add the resulting entries to the quickfix list
---     {nr} or {id}.  Only a |List| value is supported.
---     See |quickfix-parse|
---     nr    list number in the quickfix stack; zero
---     means the current quickfix list and "$" means
---     the last quickfix list.
---     quickfixtextfunc
---     function to get the text to display in the
---     quickfix window.  The value can be the name of
---     a function or a funcref or a lambda.  Refer to
---     |quickfix-window-function| for an explanation
---     of how to write the function and an example.
---     title  quickfix list title text.  See |quickfix-title|
--- Unsupported keys in {what} are ignored.
--- If the "nr" item is not present, then the current quickfix
--- list is modified.  When creating a new quickfix list, "nr" can
--- be set to a value one greater than the quickfix stack size.
--- When modifying a quickfix list, to guarantee that the correct
--- list is modified, "id" should be used instead of "nr" to
--- specify the list.
---
--- Examples (See also |setqflist-examples|): >vim
---    call setqflist([], 'r', {'title': 'My search'})
---    call setqflist([], 'r', {'nr': 2, 'title': 'Errors'})
---    call setqflist([], 'a', {'id':qfid, 'lines':["F1:10:L10"]})
--- <
--- Returns zero for success, -1 for failure.
---
--- This function can be used to create a quickfix list
--- independent of the 'errorformat' setting.  Use a command like
--- `:cc 1` to jump to the first position.
---
--- @param list vim.quickfix.entry[]
--- @param action? string
--- @param what? vim.fn.setqflist.what
--- @return integer
function vim.fn.setqflist(list, action, what) end

--- Set the register {regname} to {value}.
--- If {regname} is "" or "\@", the unnamed register '"' is used.
--- The {regname} argument is a string.
---
--- {value} may be any value returned by |getreg()| or
--- |getreginfo()|, including a |List| or |Dict|.
--- If {options} contains "a" or {regname} is upper case,
--- then the value is appended.
---
--- {options} can also contain a register type specification:
---     "c" or "v"        |charwise| mode
---     "l" or "V"        |linewise| mode
---     "b" or "<CTRL-V>" |blockwise-visual| mode
--- If a number immediately follows "b" or "<CTRL-V>" then this is
--- used as the width of the selection - if it is not specified
--- then the width of the block is set to the number of characters
--- in the longest line (counting a <Tab> as 1 character).
--- If {options} contains "u" or '"', then the unnamed register is
--- set to point to register {regname}.
---
--- If {options} contains no register settings, then the default
--- is to use character mode unless {value} ends in a <NL> for
--- string {value} and linewise mode for list {value}.  Blockwise
--- mode is never selected automatically.
--- Returns zero for success, non-zero for failure.
---
---           *E883*
--- Note: you may not use |List| containing more than one item to
---       set search and expression registers.  Lists containing
---       no items act like empty strings.
---
--- Examples: >vim
---   call setreg(v:register, \@*)
---   call setreg('*', \@%, 'ac')
---   call setreg('a', "1\n2\n3", 'b5')
---   call setreg('"', { 'points_to': 'a'})
---
--- <This example shows using the functions to save and restore a
--- register: >vim
---   let var_a = getreginfo()
---   call setreg('a', var_a)
--- <or: >vim
---   let var_a = getreg('a', 1, 1)
---   let var_amode = getregtype('a')
---   " ....
---   call setreg('a', var_a, var_amode)
--- <Note: you may not reliably restore register value
--- without using the third argument to |getreg()| as without it
--- newlines are represented as newlines AND Nul bytes are
--- represented as newlines as well, see |NL-used-for-Nul|.
---
--- You can also change the type of a register by appending
--- nothing: >vim
---   call setreg('a', '', 'al')
--- <
---
--- @param regname string
--- @param value any
--- @param options? string
--- @return any
function vim.fn.setreg(regname, value, options) end

--- Set tab-local variable {varname} to {val} in tab page {tabnr}.
--- |t:var|
--- The {varname} argument is a string.
--- Note that the variable name without "t:" must be used.
--- Tabs are numbered starting with one.
--- This function is not available in the |sandbox|.
---
--- @param tabnr integer
--- @param varname string
--- @param val any
--- @return any
function vim.fn.settabvar(tabnr, varname, val) end

--- Set option or local variable {varname} in window {winnr} to
--- {val}.
--- Tabs are numbered starting with one.  For the current tabpage
--- use |setwinvar()|.
--- {winnr} can be the window number or the |window-ID|.
--- When {winnr} is zero the current window is used.
--- This also works for a global or local buffer option, but it
--- doesn't work for a global or local buffer variable.
--- For a local buffer option the global value is unchanged.
--- Note that the variable name without "w:" must be used.
--- Examples: >vim
---   call settabwinvar(1, 1, "&list", 0)
---   call settabwinvar(3, 2, "myvar", "foobar")
--- <This function is not available in the |sandbox|.
---
--- @param tabnr integer
--- @param winnr integer
--- @param varname string
--- @param val any
--- @return any
function vim.fn.settabwinvar(tabnr, winnr, varname, val) end

--- Modify the tag stack of the window {nr} using {dict}.
--- {nr} can be the window number or the |window-ID|.
---
--- For a list of supported items in {dict}, refer to
--- |gettagstack()|.  "curidx" takes effect before changing the tag
--- stack.
---           *E962*
--- How the tag stack is modified depends on the {action}
--- argument:
--- - If {action} is not present or is set to 'r', then the tag
---   stack is replaced.
--- - If {action} is set to 'a', then new entries from {dict} are
---   pushed (added) onto the tag stack.
--- - If {action} is set to 't', then all the entries from the
---   current entry in the tag stack or "curidx" in {dict} are
---   removed and then new entries are pushed to the stack.
---
--- The current index is set to one after the length of the tag
--- stack after the modification.
---
--- Returns zero for success, -1 for failure.
---
--- Examples (for more examples see |tagstack-examples|):
---     Empty the tag stack of window 3: >vim
---   call settagstack(3, {'items' : []})
---
--- <    Save and restore the tag stack: >vim
---   let stack = gettagstack(1003)
---   " do something else
---   call settagstack(1003, stack)
---   unlet stack
--- <
---
--- @param nr integer
--- @param dict any
--- @param action? string
--- @return any
function vim.fn.settagstack(nr, dict, action) end

--- Like |settabwinvar()| for the current tab page.
--- Examples: >vim
---   call setwinvar(1, "&list", 0)
---   call setwinvar(2, "myvar", "foobar")
--- <
---
--- @param nr integer
--- @param varname string
--- @param val any
--- @return any
function vim.fn.setwinvar(nr, varname, val) end

--- Returns a String with 64 hex characters, which is the SHA256
--- checksum of {expr}.
--- {expr} is a String or a Blob.
---
--- @param expr string
--- @return string
function vim.fn.sha256(expr) end

--- Escape {string} for use as a shell command argument.
---
--- On Windows when 'shellslash' is not set, encloses {string} in
--- double-quotes and doubles all double-quotes within {string}.
--- Otherwise encloses {string} in single-quotes and replaces all
--- "'" with "'\''".
---
--- The {special} argument adds additional escaping of keywords
--- used in Vim commands. If it is a |non-zero-arg|:
--- - Special items such as "!", "%", "#" and "<cword>" (as listed
---   in |expand()|) will be preceded by a backslash.
---   The backslash will be removed again by the |:!| command.
--- - The <NL> character is escaped.
---
--- If 'shell' contains "csh" in the tail:
--- - The "!" character will be escaped. This is because csh and
---   tcsh use "!" for history replacement even in single-quotes.
--- - The <NL> character is escaped (twice if {special} is
---   a |non-zero-arg|).
---
--- If 'shell' contains "fish" in the tail, the "\" character will
--- be escaped because in fish it is used as an escape character
--- inside single quotes.
---
--- Example of use with a |:!| command: >vim
---     exe '!dir ' .. shellescape(expand('<cfile>'), 1)
--- <This results in a directory listing for the file under the
--- cursor.  Example of use with |system()|: >vim
---     call system("chmod +w -- " .. shellescape(expand("%")))
--- <See also |::S|.
---
--- @param string string
--- @param special? boolean
--- @return string
function vim.fn.shellescape(string, special) end

--- Returns the effective value of 'shiftwidth'.  This is the
--- 'shiftwidth' value unless it is zero, in which case it is the
--- 'tabstop' value.  To be backwards compatible in indent
--- plugins, use this: >vim
---   if exists('*shiftwidth')
---     func s:sw()
---       return shiftwidth()
---     endfunc
---   else
---     func s:sw()
---       return &sw
---     endfunc
---   endif
--- <And then use s:sw() instead of &sw.
---
--- for which to return the 'shiftwidth' value.  This matters for
--- the 'vartabstop' feature.  If the 'vartabstop' setting is
--- enabled and no {col} argument is given, column 1 will be
--- assumed.
---
--- @param col? integer
--- @return integer
function vim.fn.shiftwidth(col) end

--- @param name string
--- @param dict? vim.fn.sign_define.dict
--- @return 0|-1
function vim.fn.sign_define(name, dict) end

--- Define a new sign named {name} or modify the attributes of an
--- existing sign.  This is similar to the |:sign-define| command.
---
--- Prefix {name} with a unique text to avoid name collisions.
--- There is no {group} like with placing signs.
---
--- The {name} can be a String or a Number.  The optional {dict}
--- argument specifies the sign attributes.  The following values
--- are supported:
---    icon    full path to the bitmap file for the sign.
---    linehl  highlight group used for the whole line the
---     sign is placed in.
---    priority  default priority value of the sign
---    numhl  highlight group used for the line number where
---     the sign is placed.
---    text    text that is displayed when there is no icon
---     or the GUI is not being used.
---    texthl  highlight group used for the text item
---    culhl  highlight group used for the text item when
---     the cursor is on the same line as the sign and
---     'cursorline' is enabled.
---
--- If the sign named {name} already exists, then the attributes
--- of the sign are updated.
---
--- The one argument {list} can be used to define a list of signs.
--- Each list item is a dictionary with the above items in {dict}
--- and a "name" item for the sign name.
---
--- Returns 0 on success and -1 on failure.  When the one argument
--- {list} is used, then returns a List of values one for each
--- defined sign.
---
--- Examples: >vim
---   call sign_define("mySign", {
---     \ "text" : "=>",
---     \ "texthl" : "Error",
---     \ "linehl" : "Search"})
---   call sign_define([
---     \ {'name' : 'sign1',
---     \  'text' : '=>'},
---     \ {'name' : 'sign2',
---     \  'text' : '!!'}
---     \ ])
--- <
---
--- @param list vim.fn.sign_define.dict[]
--- @return (0|-1)[]
function vim.fn.sign_define(list) end

--- Get a list of defined signs and their attributes.
--- This is similar to the |:sign-list| command.
---
--- If the {name} is not supplied, then a list of all the defined
--- signs is returned.  Otherwise the attribute of the specified
--- sign is returned.
---
--- Each list item in the returned value is a dictionary with the
--- following entries:
---    icon    full path to the bitmap file of the sign
---    linehl  highlight group used for the whole line the
---     sign is placed in; not present if not set.
---    name    name of the sign
---    priority  default priority value of the sign
---    numhl  highlight group used for the line number where
---     the sign is placed; not present if not set.
---    text    text that is displayed when there is no icon
---     or the GUI is not being used.
---    texthl  highlight group used for the text item; not
---     present if not set.
---    culhl  highlight group used for the text item when
---     the cursor is on the same line as the sign and
---     'cursorline' is enabled; not present if not
---     set.
---
--- Returns an empty List if there are no signs and when {name} is
--- not found.
---
--- Examples: >vim
---   " Get a list of all the defined signs
---   echo sign_getdefined()
---
---   " Get the attribute of the sign named mySign
---   echo sign_getdefined("mySign")
--- <
---
--- @param name? string
--- @return vim.fn.sign_getdefined.ret.item[]
function vim.fn.sign_getdefined(name) end

--- Return a list of signs placed in a buffer or all the buffers.
--- This is similar to the |:sign-place-list| command.
---
--- If the optional buffer name {buf} is specified, then only the
--- list of signs placed in that buffer is returned.  For the use
--- of {buf}, see |bufname()|.  The optional {dict} can contain
--- the following entries:
---    group  select only signs in this group
---    id    select sign with this identifier
---    lnum    select signs placed in this line.  For the use
---     of {lnum}, see |line()|.
--- If {group} is "*", then signs in all the groups including the
--- global group are returned.  If {group} is not supplied or is
--- an empty string, then only signs in the global group are
--- returned.  If no arguments are supplied, then signs in the
--- global group placed in all the buffers are returned.
--- See |sign-group|.
---
--- Each list item in the returned value is a dictionary with the
--- following entries:
---   bufnr  number of the buffer with the sign
---   signs  list of signs placed in {bufnr}.  Each list
---     item is a dictionary with the below listed
---     entries
---
--- The dictionary for each sign contains the following entries:
---   group   sign group.  Set to '' for the global group.
---   id   identifier of the sign
---   lnum   line number where the sign is placed
---   name   name of the defined sign
---   priority sign priority
---
--- The returned signs in a buffer are ordered by their line
--- number and priority.
---
--- Returns an empty list on failure or if there are no placed
--- signs.
---
--- Examples: >vim
---   " Get a List of signs placed in eval.c in the
---   " global group
---   echo sign_getplaced("eval.c")
---
---   " Get a List of signs in group 'g1' placed in eval.c
---   echo sign_getplaced("eval.c", {'group' : 'g1'})
---
---   " Get a List of signs placed at line 10 in eval.c
---   echo sign_getplaced("eval.c", {'lnum' : 10})
---
---   " Get sign with identifier 10 placed in a.py
---   echo sign_getplaced("a.py", {'id' : 10})
---
---   " Get sign with id 20 in group 'g1' placed in a.py
---   echo sign_getplaced("a.py", {'group' : 'g1',
---           \  'id' : 20})
---
---   " Get a List of all the placed signs
---   echo sign_getplaced()
--- <
---
--- @param buf? integer|string
--- @param dict? vim.fn.sign_getplaced.dict
--- @return vim.fn.sign_getplaced.ret.item[]
function vim.fn.sign_getplaced(buf, dict) end

--- Open the buffer {buf} or jump to the window that contains
--- {buf} and position the cursor at sign {id} in group {group}.
--- This is similar to the |:sign-jump| command.
---
--- If {group} is an empty string, then the global group is used.
--- For the use of {buf}, see |bufname()|.
---
--- Returns the line number of the sign.  Returns -1 if the
--- arguments are invalid.
---
--- Example: >vim
---   " Jump to sign 10 in the current buffer
---   call sign_jump(10, '', '')
--- <
---
--- @param id integer
--- @param group string
--- @param buf integer|string
--- @return integer
function vim.fn.sign_jump(id, group, buf) end

--- Place the sign defined as {name} at line {lnum} in file or
--- buffer {buf} and assign {id} and {group} to sign.  This is
--- similar to the |:sign-place| command.
---
--- If the sign identifier {id} is zero, then a new identifier is
--- allocated.  Otherwise the specified number is used.  {group}
--- is the sign group name.  To use the global sign group, use an
--- empty string.  {group} functions as a namespace for {id}, thus
--- two groups can use the same IDs.  Refer to |sign-identifier|
--- and |sign-group| for more information.
---
--- {name} refers to a defined sign.
--- {buf} refers to a buffer name or number.  For the accepted
--- values, see |bufname()|.
---
--- The optional {dict} argument supports the following entries:
---   lnum    line number in the file or buffer
---       {buf} where the sign is to be placed.
---       For the accepted values, see |line()|.
---   priority  priority of the sign.  See
---       |sign-priority| for more information.
---
--- If the optional {dict} is not specified, then it modifies the
--- placed sign {id} in group {group} to use the defined sign
--- {name}.
---
--- Returns the sign identifier on success and -1 on failure.
---
--- Examples: >vim
---   " Place a sign named sign1 with id 5 at line 20 in
---   " buffer json.c
---   call sign_place(5, '', 'sign1', 'json.c',
---           \ {'lnum' : 20})
---
---   " Updates sign 5 in buffer json.c to use sign2
---   call sign_place(5, '', 'sign2', 'json.c')
---
---   " Place a sign named sign3 at line 30 in
---   " buffer json.c with a new identifier
---   let id = sign_place(0, '', 'sign3', 'json.c',
---           \ {'lnum' : 30})
---
---   " Place a sign named sign4 with id 10 in group 'g3'
---   " at line 40 in buffer json.c with priority 90
---   call sign_place(10, 'g3', 'sign4', 'json.c',
---       \ {'lnum' : 40, 'priority' : 90})
--- <
---
--- @param id integer
--- @param group string
--- @param name string
--- @param buf integer|string
--- @param dict? vim.fn.sign_place.dict
--- @return integer
function vim.fn.sign_place(id, group, name, buf, dict) end

--- Place one or more signs.  This is similar to the
--- |sign_place()| function.  The {list} argument specifies the
--- List of signs to place.  Each list item is a dict with the
--- following sign attributes:
---     buffer  Buffer name or number.  For the accepted
---     values, see |bufname()|.
---     group  Sign group.  {group} functions as a namespace
---     for {id}, thus two groups can use the same
---     IDs.  If not specified or set to an empty
---     string, then the global group is used.   See
---     |sign-group| for more information.
---     id    Sign identifier.  If not specified or zero,
---     then a new unique identifier is allocated.
---     Otherwise the specified number is used.  See
---     |sign-identifier| for more information.
---     lnum  Line number in the buffer where the sign is to
---     be placed.  For the accepted values, see
---     |line()|.
---     name  Name of the sign to place.  See |sign_define()|
---     for more information.
---     priority  Priority of the sign.  When multiple signs are
---     placed on a line, the sign with the highest
---     priority is used.  If not specified, the
---     default value of 10 is used, unless specified
---     otherwise by the sign definition.  See
---     |sign-priority| for more information.
---
--- If {id} refers to an existing sign, then the existing sign is
--- modified to use the specified {name} and/or {priority}.
---
--- Returns a List of sign identifiers.  If failed to place a
--- sign, the corresponding list item is set to -1.
---
--- Examples: >vim
---   " Place sign s1 with id 5 at line 20 and id 10 at line
---   " 30 in buffer a.c
---   let [n1, n2] = sign_placelist([
---     \ {'id' : 5,
---     \  'name' : 's1',
---     \  'buffer' : 'a.c',
---     \  'lnum' : 20},
---     \ {'id' : 10,
---     \  'name' : 's1',
---     \  'buffer' : 'a.c',
---     \  'lnum' : 30}
---     \ ])
---
---   " Place sign s1 in buffer a.c at line 40 and 50
---   " with auto-generated identifiers
---   let [n1, n2] = sign_placelist([
---     \ {'name' : 's1',
---     \  'buffer' : 'a.c',
---     \  'lnum' : 40},
---     \ {'name' : 's1',
---     \  'buffer' : 'a.c',
---     \  'lnum' : 50}
---     \ ])
--- <
---
--- @param list vim.fn.sign_placelist.list.item[]
--- @return integer[]
function vim.fn.sign_placelist(list) end

--- @param name? string
--- @return 0|-1
function vim.fn.sign_undefine(name) end

--- Deletes a previously defined sign {name}.  This is similar to
--- the |:sign-undefine| command.  If {name} is not supplied, then
--- deletes all the defined signs.
---
--- The one argument {list} can be used to undefine a list of
--- signs.  Each list item is the name of a sign.
---
--- Returns 0 on success and -1 on failure.  For the one argument
--- {list} call, returns a list of values one for each undefined
--- sign.
---
--- Examples: >vim
---   " Delete a sign named mySign
---   call sign_undefine("mySign")
---
---   " Delete signs 'sign1' and 'sign2'
---   call sign_undefine(["sign1", "sign2"])
---
---   " Delete all the signs
---   call sign_undefine()
--- <
---
--- @param list? string[]
--- @return integer[]
function vim.fn.sign_undefine(list) end

--- Remove a previously placed sign in one or more buffers.  This
--- is similar to the |:sign-unplace| command.
---
--- {group} is the sign group name.  To use the global sign group,
--- use an empty string.  If {group} is set to "*", then all the
--- groups including the global group are used.
--- The signs in {group} are selected based on the entries in
--- {dict}.  The following optional entries in {dict} are
--- supported:
---   buffer  buffer name or number.  See |bufname()|.
---   id  sign identifier
--- If {dict} is not supplied, then all the signs in {group} are
--- removed.
---
--- Returns 0 on success and -1 on failure.
---
--- Examples: >vim
---   " Remove sign 10 from buffer a.vim
---   call sign_unplace('', {'buffer' : "a.vim", 'id' : 10})
---
---   " Remove sign 20 in group 'g1' from buffer 3
---   call sign_unplace('g1', {'buffer' : 3, 'id' : 20})
---
---   " Remove all the signs in group 'g2' from buffer 10
---   call sign_unplace('g2', {'buffer' : 10})
---
---   " Remove sign 30 in group 'g3' from all the buffers
---   call sign_unplace('g3', {'id' : 30})
---
---   " Remove all the signs placed in buffer 5
---   call sign_unplace('*', {'buffer' : 5})
---
---   " Remove the signs in group 'g4' from all the buffers
---   call sign_unplace('g4')
---
---   " Remove sign 40 from all the buffers
---   call sign_unplace('*', {'id' : 40})
---
---   " Remove all the placed signs from all the buffers
---   call sign_unplace('*')
--- <
---
--- @param group string
--- @param dict? vim.fn.sign_unplace.dict
--- @return 0|-1
function vim.fn.sign_unplace(group, dict) end

--- Remove previously placed signs from one or more buffers.  This
--- is similar to the |sign_unplace()| function.
---
--- The {list} argument specifies the List of signs to remove.
--- Each list item is a dict with the following sign attributes:
---     buffer  buffer name or number.  For the accepted
---     values, see |bufname()|.  If not specified,
---     then the specified sign is removed from all
---     the buffers.
---     group  sign group name.  If not specified or set to an
---     empty string, then the global sign group is
---     used.  If set to "*", then all the groups
---     including the global group are used.
---     id    sign identifier.  If not specified, then all
---     the signs in the specified group are removed.
---
--- Returns a List where an entry is set to 0 if the corresponding
--- sign was successfully removed or -1 on failure.
---
--- Example: >vim
---   " Remove sign with id 10 from buffer a.vim and sign
---   " with id 20 from buffer b.vim
---   call sign_unplacelist([
---     \ {'id' : 10, 'buffer' : "a.vim"},
---     \ {'id' : 20, 'buffer' : 'b.vim'},
---     \ ])
--- <
---
--- @param list vim.fn.sign_unplacelist.list.item
--- @return (0|-1)[]
function vim.fn.sign_unplacelist(list) end

--- Simplify the file name as much as possible without changing
--- the meaning.  Shortcuts (on MS-Windows) or symbolic links (on
--- Unix) are not resolved.  If the first path component in
--- {filename} designates the current directory, this will be
--- valid for the result as well.  A trailing path separator is
--- not removed either.  On Unix "//path" is unchanged, but
--- "///path" is simplified to "/path" (this follows the Posix
--- standard).
--- Example: >vim
---   simplify("./dir/.././/file/") == "./file/"
--- <Note: The combination "dir/.." is only removed if "dir" is
--- a searchable directory or does not exist.  On Unix, it is also
--- removed when "dir" is a symbolic link within the same
--- directory.  In order to resolve all the involved symbolic
--- links before simplifying the path name, use |resolve()|.
---
--- @param filename string
--- @return string
function vim.fn.simplify(filename) end

--- Return the sine of {expr}, measured in radians, as a |Float|.
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo sin(100)
--- <  -0.506366 >vim
---   echo sin(-4.01)
--- <  0.763301
---
--- @param expr number
--- @return number
function vim.fn.sin(expr) end

--- Return the hyperbolic sine of {expr} as a |Float| in the range
--- [-inf, inf].
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo sinh(0.5)
--- <  0.521095 >vim
---   echo sinh(-0.9)
--- <  -1.026517
---
--- @param expr number
--- @return any
function vim.fn.sinh(expr) end

--- Similar to using a |slice| "expr[start : end]", but "end" is
--- used exclusive.  And for a string the indexes are used as
--- character indexes instead of byte indexes.
--- Also, composing characters are treated as a part of the
--- preceding base character.
--- When {end} is omitted the slice continues to the last item.
--- When {end} is -1 the last item is omitted.
--- Returns an empty value if {start} or {end} are invalid.
---
--- @param expr any
--- @param start integer
--- @param end_? integer
--- @return any
function vim.fn.slice(expr, start, end_) end

--- Connect a socket to an address. If {mode} is "pipe" then
--- {address} should be the path of a local domain socket (on
--- unix) or named pipe (on Windows). If {mode} is "tcp" then
--- {address} should be of the form "host:port" where the host
--- should be an ip address or host name, and port the port
--- number.
---
--- For "pipe" mode, see |luv-pipe-handle|. For "tcp" mode, see
--- |luv-tcp-handle|.
---
--- Returns a |channel| ID. Close the socket with |chanclose()|.
--- Use |chansend()| to send data over a bytes socket, and
--- |rpcrequest()| and |rpcnotify()| to communicate with a RPC
--- socket.
---
--- {opts} is an optional dictionary with these keys:
---   |on_data| : callback invoked when data was read from socket
---   data_buffered : read socket data in |channel-buffered| mode.
---   rpc     : If set, |msgpack-rpc| will be used to communicate
---       over the socket.
--- Returns:
---   - The channel ID on success (greater than zero)
---   - 0 on invalid arguments or connection failure.
---
--- @param mode string
--- @param address string
--- @param opts? table
--- @return any
function vim.fn.sockconnect(mode, address, opts) end

--- Sort the items in {list} in-place.  Returns {list}.
---
--- If you want a list to remain unmodified make a copy first: >vim
---   let sortedlist = sort(copy(mylist))
---
--- <When {how} is omitted or is a string, then sort() uses the
--- string representation of each item to sort on.  Numbers sort
--- after Strings, |Lists| after Numbers.  For sorting text in the
--- current buffer use |:sort|.
---
--- When {how} is given and it is 'i' then case is ignored.
--- For backwards compatibility, the value one can be used to
--- ignore case.  Zero means to not ignore case.
---
--- When {how} is given and it is 'l' then the current collation
--- locale is used for ordering.  Implementation details:
--- strcoll() is used to compare strings.  See |:language| to check
--- or set the collation locale.  |v:collate| can also be used to
--- check the current locale.  Sorting using the locale typically
--- ignores case.  Example: >vim
---   " ö is sorted similarly to o with English locale.
---   language collate en_US.UTF8
---   echo sort(['n', 'o', 'O', 'ö', 'p', 'z'], 'l')
--- <  ['n', 'o', 'O', 'ö', 'p', 'z'] ~
--- >vim
---   " ö is sorted after z with Swedish locale.
---   language collate sv_SE.UTF8
---   echo sort(['n', 'o', 'O', 'ö', 'p', 'z'], 'l')
--- <  ['n', 'o', 'O', 'p', 'z', 'ö'] ~
--- This does not work properly on Mac.
---
--- When {how} is given and it is 'n' then all items will be
--- sorted numerical (Implementation detail: this uses the
--- strtod() function to parse numbers, Strings, Lists, Dicts and
--- Funcrefs will be considered as being 0).
---
--- When {how} is given and it is 'N' then all items will be
--- sorted numerical.  This is like 'n' but a string containing
--- digits will be used as the number they represent.
---
--- When {how} is given and it is 'f' then all items will be
--- sorted numerical.  All values must be a Number or a Float.
---
--- When {how} is a |Funcref| or a function name, this function
--- is called to compare items.  The function is invoked with two
--- items as argument and must return zero if they are equal, 1 or
--- bigger if the first one sorts after the second one, -1 or
--- smaller if the first one sorts before the second one.
---
--- {dict} is for functions with the "dict" attribute.  It will be
--- used to set the local variable "self". |Dictionary-function|
---
--- The sort is stable, items which compare equal (as number or as
--- string) will keep their relative position.  E.g., when sorting
--- on numbers, text strings will sort next to each other, in the
--- same order as they were originally.
---
---
--- Example: >vim
---   func MyCompare(i1, i2)
---      return a:i1 == a:i2 ? 0 : a:i1 > a:i2 ? 1 : -1
---   endfunc
---   eval mylist->sort("MyCompare")
--- <A shorter compare version for this specific simple case, which
--- ignores overflow: >vim
---   func MyCompare(i1, i2)
---      return a:i1 - a:i2
---   endfunc
--- <For a simple expression you can use a lambda: >vim
---   eval mylist->sort({i1, i2 -> i1 - i2})
--- <
---
--- @generic T
--- @param list T[]
--- @param how? string|function
--- @param dict? any
--- @return T[]
function vim.fn.sort(list, how, dict) end

--- Return the sound-folded equivalent of {word}.  Uses the first
--- language in 'spelllang' for the current window that supports
--- soundfolding.  'spell' must be set.  When no sound folding is
--- possible the {word} is returned unmodified.
--- This can be used for making spelling suggestions.  Note that
--- the method can be quite slow.
---
--- @param word string
--- @return string
function vim.fn.soundfold(word) end

--- Without argument: The result is the badly spelled word under
--- or after the cursor.  The cursor is moved to the start of the
--- bad word.  When no bad word is found in the cursor line the
--- result is an empty string and the cursor doesn't move.
---
--- With argument: The result is the first word in {sentence} that
--- is badly spelled.  If there are no spelling mistakes the
--- result is an empty string.
---
--- The return value is a list with two items:
--- - The badly spelled word or an empty string.
--- - The type of the spelling error:
---   "bad"    spelling mistake
---   "rare"    rare word
---   "local"    word only valid in another region
---   "caps"    word should start with Capital
--- Example: >vim
---   echo spellbadword("the quik brown fox")
--- <  ['quik', 'bad'] ~
---
--- The spelling information for the current window and the value
--- of 'spelllang' are used.
---
--- @param sentence? string
--- @return any
function vim.fn.spellbadword(sentence) end

--- Return a |List| with spelling suggestions to replace {word}.
--- When {max} is given up to this number of suggestions are
--- returned.  Otherwise up to 25 suggestions are returned.
---
--- When the {capital} argument is given and it's non-zero only
--- suggestions with a leading capital will be given.  Use this
--- after a match with 'spellcapcheck'.
---
--- {word} can be a badly spelled word followed by other text.
--- This allows for joining two words that were split.  The
--- suggestions also include the following text, thus you can
--- replace a line.
---
--- {word} may also be a good word.  Similar words will then be
--- returned.  {word} itself is not included in the suggestions,
--- although it may appear capitalized.
---
--- The spelling information for the current window is used.  The
--- values of 'spelllang' and 'spellsuggest' are used.
---
--- @param word string
--- @param max? integer
--- @param capital? boolean
--- @return string[]
function vim.fn.spellsuggest(word, max, capital) end

--- Make a |List| out of {string}.  When {pattern} is omitted or
--- empty each white space separated sequence of characters
--- becomes an item.
--- Otherwise the string is split where {pattern} matches,
--- removing the matched characters.  'ignorecase' is not used
--- here, add \c to ignore case. |/\c|
--- When the first or last item is empty it is omitted, unless the
--- {keepempty} argument is given and it's non-zero.
--- Other empty items are kept when {pattern} matches at least one
--- character or when {keepempty} is non-zero.
--- Example: >vim
---   let words = split(getline('.'), '\W\+')
--- <To split a string in individual characters: >vim
---   for c in split(mystring, '\zs') | endfor
--- <If you want to keep the separator you can also use '\zs' at
--- the end of the pattern: >vim
---   echo split('abc:def:ghi', ':\zs')
--- < >
---   ['abc:', 'def:', 'ghi']
--- <
--- Splitting a table where the first element can be empty: >vim
---   let items = split(line, ':', 1)
--- <The opposite function is |join()|.
---
--- @param string string
--- @param pattern? string
--- @param keepempty? boolean
--- @return string[]
function vim.fn.split(string, pattern, keepempty) end

--- Return the non-negative square root of Float {expr} as a
--- |Float|.
--- {expr} must evaluate to a |Float| or a |Number|.  When {expr}
--- is negative the result is NaN (Not a Number).  Returns 0.0 if
--- {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo sqrt(100)
--- <  10.0 >vim
---   echo sqrt(-4.01)
--- <  str2float("nan")
--- NaN may be different, it depends on system libraries.
---
--- @param expr number
--- @return any
function vim.fn.sqrt(expr) end

--- Initialize seed used by |rand()|:
--- - If {expr} is not given, seed values are initialized by
---   reading from /dev/urandom, if possible, or using time(NULL)
---   a.k.a. epoch time otherwise; this only has second accuracy.
--- - If {expr} is given it must be a Number.  It is used to
---   initialize the seed values.  This is useful for testing or
---   when a predictable sequence is intended.
---
--- Examples: >vim
---   let seed = srand()
---   let seed = srand(userinput)
---   echo rand(seed)
--- <
---
--- @param expr? number
--- @return any
function vim.fn.srand(expr) end

--- Return a string which contains characters indicating the
--- current state.  Mostly useful in callbacks that want to do
--- work that may not always be safe.  Roughly this works like:
--- - callback uses state() to check if work is safe to do.
---   Yes: then do it right away.
---   No:  add to work queue and add a |SafeState| autocommand.
--- - When SafeState is triggered and executes your autocommand,
---   check with `state()` if the work can be done now, and if yes
---   remove it from the queue and execute.
---   Remove the autocommand if the queue is now empty.
--- Also see |mode()|.
---
--- When {what} is given only characters in this string will be
--- added.  E.g, this checks if the screen has scrolled: >vim
---   if state('s') == ''
---      " screen has not scrolled
--- <
--- These characters indicate the state, generally indicating that
--- something is busy:
---     m  halfway a mapping, :normal command, |feedkeys()| or
---   stuffed command
---     o  operator pending, e.g. after |d|
---     a  Insert mode autocomplete active
---     x  executing an autocommand
---     S  not triggering SafeState, e.g. after |f| or a count
---     c  callback invoked, including timer (repeats for
---   recursiveness up to "ccc")
---     s  screen has scrolled for messages
---
--- @param what? string
--- @return any
function vim.fn.state(what) end

--- With |--headless| this opens stdin and stdout as a |channel|.
--- May be called only once. See |channel-stdio|. stderr is not
--- handled by this function, see |v:stderr|.
---
--- Close the stdio handles with |chanclose()|. Use |chansend()|
--- to send data to stdout, and |rpcrequest()| and |rpcnotify()|
--- to communicate over RPC.
---
--- {opts} is a dictionary with these keys:
---   |on_stdin| : callback invoked when stdin is written to.
---   on_print : callback invoked when Nvim needs to print a
---        message, with the message (whose type is string)
---        as sole argument.
---   stdin_buffered : read stdin in |channel-buffered| mode.
---   rpc      : If set, |msgpack-rpc| will be used to communicate
---        over stdio
--- Returns:
---   - |channel-id| on success (value is always 1)
---   - 0 on invalid arguments
---
--- @param opts table
--- @return any
function vim.fn.stdioopen(opts) end

--- Returns |standard-path| locations of various default files and
--- directories. The locations are driven by |base-directories|
--- which you can configure via |$NVIM_APPNAME| or the `$XDG_…`
--- environment variables.
---
--- {what}       Type    Description ~
--- cache        String  Cache directory: arbitrary temporary
---                      storage for plugins, etc.
--- config       String  User configuration directory. |init.vim|
---                      is stored here.
--- config_dirs  List    Other configuration directories.
--- data         String  User data directory.
--- data_dirs    List    Other data directories.
--- log          String  Logs directory (for use by plugins too).
--- run          String  Run directory: temporary, local storage
---          for sockets, named pipes, etc.
--- state        String  Session state: storage for backupdir,
---          file drafts, |shada|, swap, undo, 'viewdir'.
---
--- Example: >vim
---   echo stdpath("config")
--- <
---
--- @param what 'cache'|'config'|'config_dirs'|'data'|'data_dirs'|'log'|'run'|'state'
--- @return string|string[]
function vim.fn.stdpath(what) end

--- @param what 'cache'|'config'|'data'|'log'|'run'|'state'
--- @return string
function vim.fn.stdpath(what) end

--- @param what 'config_dirs'|'data_dirs'
--- @return string[]
function vim.fn.stdpath(what) end

--- Convert String {string} to a Float.  This mostly works the
--- same as when using a floating point number in an expression,
--- see |floating-point-format|.  But it's a bit more permissive.
--- E.g., "1e40" is accepted, while in an expression you need to
--- write "1.0e40".  The hexadecimal form "0x123" is also
--- accepted, but not others, like binary or octal.
--- When {quoted} is present and non-zero then embedded single
--- quotes before the dot are ignored, thus "1'000.0" is a
--- thousand.
--- Text after the number is silently ignored.
--- The decimal point is always '.', no matter what the locale is
--- set to.  A comma ends the number: "12,345.67" is converted to
--- 12.0.  You can strip out thousands separators with
--- |substitute()|: >vim
---   let f = str2float(substitute(text, ',', '', 'g'))
--- <
--- Returns 0.0 if the conversion fails.
---
--- @param string string
--- @param quoted? boolean
--- @return any
function vim.fn.str2float(string, quoted) end

--- Return a list containing the number values which represent
--- each character in String {string}.  Examples: >vim
---   echo str2list(" ")    " returns [32]
---   echo str2list("ABC")    " returns [65, 66, 67]
--- <|list2str()| does the opposite.
---
--- UTF-8 encoding is always used, {utf8} option has no effect,
--- and exists only for backwards-compatibility.
--- With UTF-8 composing characters are handled properly: >vim
---   echo str2list("á")    " returns [97, 769]
--- <
---
--- @param string string
--- @param utf8? boolean
--- @return any
function vim.fn.str2list(string, utf8) end

--- Convert string {string} to a number.
--- {base} is the conversion base, it can be 2, 8, 10 or 16.
--- When {quoted} is present and non-zero then embedded single
--- quotes are ignored, thus "1'000'000" is a million.
---
--- When {base} is omitted base 10 is used.  This also means that
--- a leading zero doesn't cause octal conversion to be used, as
--- with the default String to Number conversion.  Example: >vim
---   let nr = str2nr('0123')
--- <
--- When {base} is 16 a leading "0x" or "0X" is ignored.  With a
--- different base the result will be zero. Similarly, when
--- {base} is 8 a leading "0", "0o" or "0O" is ignored, and when
--- {base} is 2 a leading "0b" or "0B" is ignored.
--- Text after the number is silently ignored.
---
--- Returns 0 if {string} is empty or on error.
---
--- @param string string
--- @param base? integer
--- @return any
function vim.fn.str2nr(string, base) end

--- Returns the number of characters in String {string}, ignoring
--- composing characters. Returns 0 on error or empty {string}.
---
--- |strchars()| can count the number of characters, counting
--- composing characters separately.
---
--- Also see |strlen()|, |strdisplaywidth()| and |strwidth()|.
---
--- @param string string
--- @return integer
function vim.fn.strcharlen(string) end

--- Like |strpart()| but using character index and length instead
--- of byte index and length.
--- When {skipcc} is omitted or zero, composing characters are
--- counted separately.
--- When {skipcc} set to 1, composing characters are treated as a
--- part of the preceding base character, similar to |slice()|.
--- When a character index is used where a character does not
--- exist it is omitted and counted as one character.  For
--- example: >vim
---   echo strcharpart('abc', -1, 2)
--- <results in 'a'.
---
--- Returns an empty string on error.
---
--- @param src string
--- @param start integer
--- @param len? integer
--- @param skipcc? 0|1|boolean
--- @return string
function vim.fn.strcharpart(src, start, len, skipcc) end

--- Returns the number of characters in String {string}.
--- When {skipcc} is omitted or zero, composing characters are
--- counted separately.
--- When {skipcc} set to 1, composing characters are ignored.
--- |strcharlen()| always does this.
---
--- Returns zero on error.
---
--- Also see |strlen()|, |strdisplaywidth()| and |strwidth()|.
---
--- {skipcc} is only available after 7.4.755.  For backward
--- compatibility, you can define a wrapper function: >vim
---     if has("patch-7.4.755")
---       function s:strchars(str, skipcc)
---   return strchars(a:str, a:skipcc)
---       endfunction
---     else
---       function s:strchars(str, skipcc)
---   if a:skipcc
---     return strlen(substitute(a:str, ".", "x", "g"))
---   else
---     return strchars(a:str)
---   endif
---       endfunction
---     endif
--- <
---
--- @param string string
--- @param skipcc? 0|1|boolean
--- @return integer
function vim.fn.strchars(string, skipcc) end

--- Returns the number of display cells String {string} occupies
--- on the screen when it starts at {col} (first column is zero).
--- Returns zero on error.
---
--- When {col} is omitted zero is used. Otherwise it is the screen
--- column where to start.  This matters for Tab characters.
--- The option settings of the current window are used.  This
--- matters for anything that's displayed differently, such as
--- 'tabstop' and 'display'.
---
--- When {string} contains characters with East Asian Width Class
--- Ambiguous, this function's return value depends on
--- 'ambiwidth'.
---
--- Also see |strlen()|, |strwidth()| and |strchars()|.
---
--- @param string string
--- @param col? integer
--- @return integer
function vim.fn.strdisplaywidth(string, col) end

--- Formats a date and time String specified by {format}.  The
--- given {time} is used, or the current time if no time is given.
--- The {format} depends on your system, this is not portable!
--- See the manual page of the C function strftime() for the
--- format.  The maximum length of the result is 80 characters.
--- See also |localtime()|, |getftime()| and |strptime()|.
--- The language can be changed with the |:language| command.
--- Examples: >vim
---   echo strftime("%c")       " Sun Apr 27 11:49:23 1997
---   echo strftime("%Y %b %d %X")     " 1997 Apr 27 11:53:25
---   echo strftime("%y%m%d %T")     " 970427 11:53:55
---   echo strftime("%H:%M")       " 11:55
---   echo strftime("%c", getftime("file.c"))
---            " Show mod time of file.c.
--- <
---
--- @param format string
--- @param time? number
--- @return string
function vim.fn.strftime(format, time) end

--- Get a Number corresponding to the character at {index} in
--- {str}.  This uses a zero-based character index, not a byte
--- index.  Composing characters are considered separate
--- characters here.  Use |nr2char()| to convert the Number to a
--- String.
--- Returns -1 if {index} is invalid.
--- Also see |strcharpart()| and |strchars()|.
---
--- @param str string
--- @param index integer
--- @return integer
function vim.fn.strgetchar(str, index) end

--- Returns the byte index of the first occurrence of {needle}
--- in {haystack}.
--- If {start} is specified, the search starts at index {start}.
--- This can be used to find a second match: >vim
---   let colon1 = stridx(line, ":")
---   let colon2 = stridx(line, ":", colon1 + 1)
--- <The search is done case-sensitive.
--- For pattern searches use |match()|.
--- -1 is returned if the {needle} does not occur in {haystack}.
--- See also |strridx()|.
--- Examples: >vim
---   echo stridx("An Example", "Example")     " 3
---   echo stridx("Starting point", "Start")   " 0
---   echo stridx("Starting point", "start")   " -1
--- <          *strstr()* *strchr()*
--- stridx() works similar to the C function strstr().  When used
--- with a single character it works similar to strchr().
---
--- @param haystack string
--- @param needle string
--- @param start? integer
--- @return integer
function vim.fn.stridx(haystack, needle, start) end

--- Converts {expr} to a String.  If {expr} is a Number, Float,
--- String, Blob or a composition of them, the result can be
--- parsed back with |eval()|.
---
---   {expr} type  result ~
---   String    `'string'`
---   Number    123
---   Float    123.123456 or 1.123456e8 or
---       `str2float('inf')`
---   Funcref    `function('name')`
---   Blob    0z00112233.44556677.8899
---   List    [item, item]
---   Dictionary  `{key: value, key: value}`
---
--- Note: in String values the ' character is doubled.
--- Also see |strtrans()|.
---
--- Note: Output format is mostly compatible with YAML, except for
--- infinite and NaN floating-point values representations which
--- use |str2float()|.  Strings are also dumped literally, only
--- single quote is escaped, which does not allow using YAML for
--- parsing back binary strings.  |eval()| should always work for
--- strings and floats though, and this is the only official
--- method.  Use |msgpackdump()| or |json_encode()| if you need to
--- share data with other applications.
---
--- @param expr any
--- @return string
function vim.fn.string(expr) end

--- Returns the length of String {string} in bytes.
--- If the argument is a Number it is first converted to a String.
--- For other types an error is given and zero is returned.
--- If you want to count the number of multibyte characters use
--- |strchars()|.
--- Also see |len()|, |strdisplaywidth()| and |strwidth()|.
---
--- @param string string
--- @return integer
function vim.fn.strlen(string) end

--- Gets a substring from {src}, starting from byte {start}, with
--- byte length {len}. Returns empty string on error.
---
--- When {chars} is present and TRUE then {len} is the number of
--- characters positions (composing characters are not counted
--- separately, thus "1" means one base character and any
--- following composing characters).
---
--- To count {start} as characters instead of bytes use
--- |strcharpart()|.
---
--- When bytes are selected which do not exist, this doesn't
--- result in an error, the bytes are simply omitted.
--- If {len} is missing, the copy continues from {start} till the
--- end of the {src}. >vim
---   echo strpart("abcdefg", 3, 2)    " returns 'de'
---   echo strpart("abcdefg", -2, 4)   " returns 'ab'
---   echo strpart("abcdefg", 5, 4)    " returns 'fg'
---   echo strpart("abcdefg", 3)   " returns 'defg'
---
--- <Note: To get the first character, {start} must be 0.  For
--- example, to get the character under the cursor: >vim
---   strpart(getline("."), col(".") - 1, 1, v:true)
--- <
---
--- @param src string
--- @param start integer
--- @param len? integer
--- @param chars? 0|1
--- @return string
function vim.fn.strpart(src, start, len, chars) end

--- Parses a date/time string and returns a unix timestamp.
--- {timestring} must match the format specified in {format}.
---
--- The {format} depends on your system, this is not portable!
--- See the strptime() manpage for the format.  Especially avoid
--- "%c".  The value of $TZ also matters.
---
--- If the {timestring} cannot be parsed with {format} zero is
--- returned.  If you do not know the format of {timestring} you
--- can try different {format} values until you get a non-zero
--- result.
---
--- See also |strftime()|.
--- Examples: >vim
---   echo strptime("%Y %b %d %X", "1997 Apr 27 11:49:23")
--- <  862156163 >vim
---   echo strftime("%c", strptime("%y%m%d %T", "970427 11:53:55"))
--- <  Sun Apr 27 11:53:55 1997 >vim
---   echo strftime("%c", strptime("%Y%m%d%H%M%S", "19970427115355") + 3600)
--- <  Sun Apr 27 12:53:55 1997
---
--- @param format string
--- @param timestring string
--- @return integer
function vim.fn.strptime(format, timestring) end

--- Returns the byte index of the last occurrence of {needle}
--- in {haystack}.
--- When {start} is specified, matches beyond this index are
--- ignored.  This can be used to find a match before a previous
--- match: >vim
---   let lastcomma = strridx(line, ",")
---   let comma2 = strridx(line, ",", lastcomma - 1)
--- <The search is done case-sensitive.
--- For pattern searches use |match()|.
--- -1 is returned if the {needle} does not occur in {haystack}.
--- If the {needle} is empty the length of {haystack} is returned.
--- See also |stridx()|.  Examples: >vim
---   echo strridx("an angry armadillo", "an")       3
--- <          *strrchr()*
--- When used with a single character it works similar to the C
--- function strrchr().
---
--- @param haystack string
--- @param needle string
--- @param start? integer
--- @return integer
function vim.fn.strridx(haystack, needle, start) end

--- Translates all unprintable characters in {string} into
--- printable characters 'isprint', like they are shown in a
--- window.  Example: >vim
---   echo strtrans(\@a)
--- <This displays a newline in register a as "^\@" instead of
--- starting a new line.
---
--- Returns an empty string on error.
---
--- @param string string
--- @return string
function vim.fn.strtrans(string) end

--- Returns the number of UTF-16 code units in String {string}
--- (after converting it to UTF-16).
---
--- When {countcc} is TRUE, composing characters are counted
--- separately.
--- When {countcc} is omitted or FALSE, composing characters are
--- ignored.
---
--- Returns zero on error.
---
--- Also see |strlen()| and |strcharlen()|.
--- Examples: >vim
---     echo strutf16len('a')    " returns 1
---     echo strutf16len('©')    " returns 1
---     echo strutf16len('😊')    " returns 2
---     echo strutf16len('ą́')    " returns 1
---     echo strutf16len('ą́', v:true)  " returns 3
--- <
---
--- @param string string
--- @param countcc? 0|1
--- @return integer
function vim.fn.strutf16len(string, countcc) end

--- Returns the number of display cells String {string} occupies.
--- A Tab character is counted as one cell, alternatively use
--- |strdisplaywidth()|.
--- When {string} contains characters with East Asian Width Class
--- Ambiguous, this function's return value depends on
--- 'ambiwidth'.
--- Returns zero on error.
--- Also see |strlen()|, |strdisplaywidth()| and |strchars()|.
---
--- @param string string
--- @return integer
function vim.fn.strwidth(string) end

--- Only for an expression in a |:substitute| command or
--- |substitute()| function.
--- Returns the {nr}th submatch of the matched text.  When {nr}
--- is 0 the whole matched text is returned.
--- Note that a NL in the string can stand for a line break of a
--- multi-line match or a NUL character in the text.
--- Also see |sub-replace-expression|.
---
--- If {list} is present and non-zero then submatch() returns
--- a list of strings, similar to |getline()| with two arguments.
--- NL characters in the text represent NUL characters in the
--- text.
--- Only returns more than one item for |:substitute|, inside
--- |substitute()| this list will always contain one or zero
--- items, since there are no real line breaks.
---
--- When |substitute()| is used recursively only the submatches in
--- the current (deepest) call can be obtained.
---
--- Returns an empty string or list on error.
---
--- Examples: >vim
---   s/\d\+/\=submatch(0) + 1/
---   echo substitute(text, '\d\+', '\=submatch(0) + 1', '')
--- <This finds the first number in the line and adds one to it.
--- A line break is included as a newline character.
---
--- @param nr integer
--- @param list? nil
--- @return string
function vim.fn.submatch(nr, list) end

--- @param nr integer
--- @param list integer
--- @return string|string[]
function vim.fn.submatch(nr, list) end

--- Performs string substitution.  Returns a copy of {string}
--- in which the first match of {pat} is replaced with {sub}.
--- When {flags} is "g", all matches of {pat} in {string} are
--- replaced.  Otherwise {flags} should be "".
---
--- This works like the ":substitute" command (without any flags).
--- But the matching with {pat} is always done like the 'magic'
--- option is set and 'cpoptions' is empty (to make scripts
--- portable).  'ignorecase' is still relevant, use |/\c| or |/\C|
--- if you want to ignore or match case and ignore 'ignorecase'.
--- 'smartcase' is not used.  See |string-match| for how {pat} is
--- used.
---
--- A "~" in {sub} is not replaced with the previous {sub}.
--- Note that some codes in {sub} have a special meaning
--- |sub-replace-special|.  For example, to replace something with
--- "\n" (two characters), use "\\\\n" or '\\n'.
---
--- When {pat} does not match in {string}, {string} is returned
--- unmodified.
---
--- Example: >vim
---   let &path = substitute(&path, ",\\=[^,]*$", "", "")
--- <This removes the last component of the 'path' option. >vim
---   echo substitute("testing", ".*", "\\U\\0", "")
--- <results in "TESTING".
---
--- When {sub} starts with "\=", the remainder is interpreted as
--- an expression.  See |sub-replace-expression|.  Example: >vim
---   echo substitute(s, '%\(\x\x\)',
---      \ '\=nr2char("0x" .. submatch(1))', 'g')
---
--- <When {sub} is a Funcref that function is called, with one
--- optional argument.  Example: >vim
---    echo substitute(s, '%\(\x\x\)', SubNr, 'g')
--- <The optional argument is a list which contains the whole
--- matched string and up to nine submatches, like what
--- |submatch()| returns.  Example: >vim
---    echo substitute(s, '%\(\x\x\)', {m -> '0x' .. m[1]}, 'g')
---
--- <Returns an empty string on error.
---
--- @param string string
--- @param pat string
--- @param sub string
--- @param flags string
--- @return string
function vim.fn.substitute(string, pat, sub, flags) end

--- Returns a list of swap file names, like what "vim -r" shows.
--- See the |-r| command argument.  The 'directory' option is used
--- for the directories to inspect.  If you only want to get a
--- list of swap files in the current directory then temporarily
--- set 'directory' to a dot: >vim
---   let save_dir = &directory
---   let &directory = '.'
---   let swapfiles = swapfilelist()
---   let &directory = save_dir
--- <
---
--- @return string[]
function vim.fn.swapfilelist() end

--- Returns information about the swapfile {fname} as a
--- dictionary.  The available fields are:
---   version Vim version
---   user  user name
---   host  host name
---   fname  original file name
---   pid  PID of the Nvim process that created the swap
---     file, or zero if not running.
---   mtime  last modification time in seconds
---   inode  Optional: INODE number of the file
---   dirty  1 if file was modified, 0 if not
--- In case of failure an "error" item is added with the reason:
---   Cannot open file: file not found or in accessible
---   Cannot read file: cannot read first block
---   Not a swap file: does not contain correct block ID
---   Magic number mismatch: Info in first block is invalid
---
--- @param fname string
--- @return any
function vim.fn.swapinfo(fname) end

--- The result is the swap file path of the buffer {buf}.
--- For the use of {buf}, see |bufname()| above.
--- If buffer {buf} is the current buffer, the result is equal to
--- |:swapname| (unless there is no swap file).
--- If buffer {buf} has no swap file, returns an empty string.
---
--- @param buf integer|string
--- @return string
function vim.fn.swapname(buf) end

--- Returns the syntax ID at position {lnum} and {col} in the
--- current window.  The syntax ID can be used with |synIDattr()|
--- and |synIDtrans()| to obtain syntax information about text.
---
--- {col} is 1 for the leftmost column, {lnum} is 1 for the first
--- line.  'synmaxcol' applies, in a longer line zero is returned.
--- Note that when the position is after the last character,
--- that's where the cursor can be in Insert mode, synID() returns
--- zero.  {lnum} is used like with |getline()|.
---
--- When {trans} is |TRUE|, transparent items are reduced to the
--- item that they reveal.  This is useful when wanting to know
--- the effective color.  When {trans} is |FALSE|, the transparent
--- item is returned.  This is useful when wanting to know which
--- syntax item is effective (e.g. inside parens).
--- Warning: This function can be very slow.  Best speed is
--- obtained by going through the file in forward direction.
---
--- Returns zero on error.
---
--- Example (echoes the name of the syntax item under the cursor): >vim
---   echo synIDattr(synID(line("."), col("."), 1), "name")
--- <
---
--- @param lnum integer|string
--- @param col integer
--- @param trans 0|1
--- @return integer
function vim.fn.synID(lnum, col, trans) end

--- Returns the {what} attribute of syntax ID {synID} as a
--- String.  This can be used to obtain information about a
--- syntax item.
--- {mode} can be "gui" or "cterm", to get the attributes
--- for that mode.  When {mode} is omitted, or an invalid value is
--- used, the attributes for the currently active highlighting are
--- used (GUI or cterm).
--- Use |synIDtrans()| to follow linked highlight groups.
--- {what}    result
--- "name"    the name of the syntax item
--- "fg"    foreground color (GUI: color name used to set
---     the color, cterm: color number as a string,
---     term: empty string)
--- "bg"    background color (as with "fg")
--- "font"    font name (only available in the GUI)
---     |highlight-font|
--- "sp"    special color (as with "fg") |guisp|
--- "fg#"    like "fg", but for the GUI and the GUI is
---     running the name in "#RRGGBB" form
--- "bg#"    like "fg#" for "bg"
--- "sp#"    like "fg#" for "sp"
--- "bold"    "1" if bold
--- "italic"  "1" if italic
--- "reverse"  "1" if reverse
--- "inverse"  "1" if inverse (= reverse)
--- "standout"  "1" if standout
--- "underline"  "1" if underlined
--- "undercurl"  "1" if undercurled
--- "underdouble"  "1" if double underlined
--- "underdotted"  "1" if dotted underlined
--- "underdashed"  "1" if dashed underlined
--- "strikethrough"  "1" if struckthrough
--- "altfont"  "1" if alternative font
--- "nocombine"  "1" if nocombine
--- "dim"  "1" if half-bright/dimmed
--- "blink"  "1" if blinking
--- "conceal"  "1" if concealed
--- "overline"  "1" if overlined
---
--- Returns an empty string on error.
---
--- Example (echoes the color of the syntax item under the
--- cursor): >vim
---   echo synIDattr(synIDtrans(synID(line("."), col("."), 1)), "fg")
--- <
--- Can also be used as a |method|: >vim
---   echo synID(line("."), col("."), 1)->synIDtrans()->synIDattr("fg")
--- <
---
--- @param synID integer
--- @param what string
--- @param mode? string
--- @return string
function vim.fn.synIDattr(synID, what, mode) end

--- Returns the translated syntax ID of {synID}, following
--- highlight links.  This is the syntax group ID of what is
--- being used to highlight the character.  Highlight links given with
--- ":highlight link" are followed.
---
--- Returns zero on error.
---
--- @param synID integer
--- @return integer
function vim.fn.synIDtrans(synID) end

--- Returns conceal information for the character at position
--- {lnum} and {col} as a |List| with three items:
--- 1. The first item in the list is 0 if the character is not
---    part of a concealable region, 1 if it is.  {lnum} is used
---    like with |getline()|.
--- 2. The second item in the list is a string.  If the first item
---    is 1, the second item contains the text which will be
---    displayed in place of the concealed text, depending on the
---    current setting of 'conceallevel' and 'listchars'.
--- 3. The third and final item in the list is a number
---    representing the specific syntax region matched in the
---    line.  When the character is not concealed the value is
---    zero.  This allows detection of the beginning of a new
---    concealable region if there are two consecutive regions
---    with the same replacement character.  For an example, if
---    the text is "123456" and both "23" and "45" are concealed
---    and replaced by the character "X", then:
---   call      returns ~
---   synconcealed(lnum, 1)   [0, '', 0]
---   synconcealed(lnum, 2)   [1, 'X', 1]
---   synconcealed(lnum, 3)   [1, 'X', 1]
---   synconcealed(lnum, 4)   [1, 'X', 2]
---   synconcealed(lnum, 5)   [1, 'X', 2]
---   synconcealed(lnum, 6)   [0, '', 0]
---
--- Note: Doesn't consider |matchadd()| highlighting items,
--- since syntax and matching highlighting are two different
--- mechanisms |syntax-vs-match|.
---
--- @param lnum integer|string
--- @param col integer
--- @return [integer, string, integer]
function vim.fn.synconcealed(lnum, col) end

--- Return a |List|, which is the stack of syntax items at the
--- position {lnum} and {col} in the current window.  {lnum} is
--- used like with |getline()|.  Each item in the List is an ID
--- like what |synID()| returns.
--- The first item in the List is the outer region, following are
--- items contained in that one.  The last one is what |synID()|
--- returns, unless not the whole item is highlighted or it is a
--- transparent item.
--- This function is useful for debugging a syntax file.
--- Example that shows the syntax stack under the cursor: >vim
---   for id in synstack(line("."), col("."))
---      echo synIDattr(id, "name")
---   endfor
--- <When the position specified with {lnum} and {col} is invalid
--- an empty list is returned.  The position just after the last
--- character in a line and the first column in an empty line are
--- valid positions.
---
--- @param lnum integer|string
--- @param col integer
--- @return integer[]
function vim.fn.synstack(lnum, col) end

--- Lua: Prefer |vim.system()|.
---
--- Gets the output of {cmd} as a |string| (|systemlist()| returns
--- a |List|) and sets |v:shell_error| to the error code.
--- {cmd} is treated as in |jobstart()|:
--- If {cmd} is a List it runs directly (no 'shell').
--- If {cmd} is a String it runs in the 'shell', like this: >vim
---   call jobstart(split(&shell) + split(&shellcmdflag) + ['{cmd}'])
---
--- <Not to be used for interactive commands.
---
--- Result is a String, filtered to avoid platform-specific quirks:
--- - <CR><NL> is replaced with <NL>
--- - NUL characters are replaced with SOH (0x01)
---
--- Example: >vim
---     echo system(['ls', expand('%:h')])
---
--- <If {input} is a string it is written to a pipe and passed as
--- stdin to the command.  The string is written as-is, line
--- separators are not changed.
--- If {input} is a |List| it is written to the pipe as
--- |writefile()| does with {binary} set to "b" (i.e. with
--- a newline between each list item, and newlines inside list
--- items converted to NULs).
--- When {input} is given and is a valid buffer id, the content of
--- the buffer is written to the file line by line, each line
--- terminated by NL (and NUL where the text has NL).
---             *E5677*
--- Note: system() cannot write to or read from backgrounded ("&")
--- shell commands, e.g.: >vim
---     echo system("cat - &", "foo")
--- <which is equivalent to: >
---     $ echo foo | bash -c 'cat - &'
--- <The pipes are disconnected (unless overridden by shell
--- redirection syntax) before input can reach it. Use
--- |jobstart()| instead.
---
--- Note: Use |shellescape()| or |::S| with |expand()| or
--- |fnamemodify()| to escape special characters in a command
--- argument. 'shellquote' and 'shellxquote' must be properly
--- configured. Example: >vim
---     echo system('ls '..shellescape(expand('%:h')))
---     echo system('ls '..expand('%:h:S'))
---
--- <Unlike ":!cmd" there is no automatic check for changed files.
--- Use |:checktime| to force a check.
---
--- @param cmd string|string[]
--- @param input? string|string[]|integer
--- @return string
function vim.fn.system(cmd, input) end

--- Same as |system()|, but returns a |List| with lines (parts of
--- output separated by NL) with NULs transformed into NLs.
--- Output is the same as |readfile()| will output with {binary}
--- argument set to "b", except that a final newline is not
--- preserved, unless {keepempty} is non-zero.
--- Note that on MS-Windows you may get trailing CR characters.
---
--- To see the difference between "echo hello" and "echo -n hello"
--- use |system()| and |split()|: >vim
---   echo split(system('echo hello'), '\n', 1)
--- <
--- Returns an empty string on error.
---
--- @param cmd string|string[]
--- @param input? string|string[]|integer
--- @param keepempty? integer
--- @return string[]
function vim.fn.systemlist(cmd, input, keepempty) end

--- Returns a |List| of buffer numbers, one for each window in
--- the specified tab page.
--- {arg} specifies the number of the tab page to be used.  When
--- omitted the current tab page is used.
--- When {arg} is invalid the number zero is returned.
--- To get a list of all buffers in all tabs use this: >vim
---   let buflist = []
---   for i in range(tabpagenr('$'))
---      call extend(buflist, tabpagebuflist(i + 1))
---   endfor
--- <Note that a buffer may appear in more than one window.
---
--- @param arg? integer
--- @return any
function vim.fn.tabpagebuflist(arg) end

--- Returns the number of the current tab page.  The first tab
--- page has number 1.
---
--- The optional argument {arg} supports the following values:
---   $  the number of the last tab page (the tab page
---     count).
---   #  the number of the last accessed tab page
---     (where |g<Tab>| goes to).  If there is no
---     previous tab page, 0 is returned.
--- The number can be used with the |:tab| command.
---
--- Returns zero on error.
---
--- @param arg? '$'|'#'
--- @return integer
function vim.fn.tabpagenr(arg) end

--- Like |winnr()| but for tab page {tabarg}.
--- {tabarg} specifies the number of tab page to be used.
--- {arg} is used like with |winnr()|:
--- - When omitted the current window number is returned.  This is
---   the window which will be used when going to this tab page.
--- - When "$" the number of windows is returned.
--- - When "#" the previous window nr is returned.
--- Useful examples: >vim
---     tabpagewinnr(1)      " current window of tab page 1
---     tabpagewinnr(4, '$')    " number of windows in tab page 4
--- <When {tabarg} is invalid zero is returned.
---
--- @param tabarg integer
--- @param arg? '$'|'#'
--- @return integer
function vim.fn.tabpagewinnr(tabarg, arg) end

--- Returns a |List| with the file names used to search for tags
--- for the current buffer.  This is the 'tags' option expanded.
---
--- @return string[]
function vim.fn.tagfiles() end

--- Returns a |List| of tags matching the regular expression {expr}.
---
--- If {filename} is passed it is used to prioritize the results
--- in the same way that |:tselect| does.  See |tag-priority|.
--- {filename} should be the full path of the file.
---
--- Each list item is a dictionary with at least the following
--- entries:
---   name    Name of the tag.
---   filename  Name of the file where the tag is
---       defined.  It is either relative to the
---       current directory or a full path.
---   cmd    Ex command used to locate the tag in
---       the file.
---   kind    Type of the tag.  The value for this
---       entry depends on the language specific
---       kind values.  Only available when
---       using a tags file generated by
---       Universal/Exuberant ctags or hdrtag.
---   static    A file specific tag.  Refer to
---       |static-tag| for more information.
--- More entries may be present, depending on the content of the
--- tags file: access, implementation, inherits and signature.
--- Refer to the ctags documentation for information about these
--- fields.  For C code the fields "struct", "class" and "enum"
--- may appear, they give the name of the entity the tag is
--- contained in.
---
--- The ex-command "cmd" can be either an ex search pattern, a
--- line number or a line number followed by a byte number.
---
--- If there are no matching tags, then an empty list is returned.
---
--- To get an exact tag match, the anchors '^' and '$' should be
--- used in {expr}.  This also make the function work faster.
--- Refer to |tag-regexp| for more information about the tag
--- search regular expression pattern.
---
--- Refer to 'tags' for information about how the tags file is
--- located by Vim.  Refer to |tags-file-format| for the format of
--- the tags file generated by the different ctags tools.
---
--- @param expr any
--- @param filename? string
--- @return any
function vim.fn.taglist(expr, filename) end

--- Return the tangent of {expr}, measured in radians, as a |Float|
--- in the range [-inf, inf].
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo tan(10)
--- <  0.648361 >vim
---   echo tan(-4.01)
--- <  -1.181502
---
--- @param expr number
--- @return number
function vim.fn.tan(expr) end

--- Return the hyperbolic tangent of {expr} as a |Float| in the
--- range [-1, 1].
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo tanh(0.5)
--- <  0.462117 >vim
---   echo tanh(-1)
--- <  -0.761594
---
--- @param expr number
--- @return number
function vim.fn.tanh(expr) end

--- Generates a (non-existent) filename located in the Nvim root
--- |tempdir|. Scripts can use the filename as a temporary file.
--- Example: >vim
---   let tmpfile = tempname()
---   exe "redir > " .. tmpfile
--- <
---
--- @return string
function vim.fn.tempname() end

--- @deprecated
--- Use |jobstart()| with `{term: v:true}` instead.
---
--- @param cmd string|string[]
--- @param opts? table
--- @return integer
function vim.fn.termopen(cmd, opts) end

--- Return a list with information about timers.
--- When {id} is given only information about this timer is
--- returned.  When timer {id} does not exist an empty list is
--- returned.
--- When {id} is omitted information about all timers is returned.
---
--- For each timer the information is stored in a |Dictionary| with
--- these items:
---     "id"      the timer ID
---     "time"      time the timer was started with
---     "repeat"      number of times the timer will still fire;
---         -1 means forever
---     "callback"      the callback
---
--- @param id? integer
--- @return any
function vim.fn.timer_info(id) end

--- Pause or unpause a timer.  A paused timer does not invoke its
--- callback when its time expires.  Unpausing a timer may cause
--- the callback to be invoked almost immediately if enough time
--- has passed.
---
--- Pausing a timer is useful to avoid the callback to be called
--- for a short time.
---
--- If {paused} evaluates to a non-zero Number or a non-empty
--- String, then the timer is paused, otherwise it is unpaused.
--- See |non-zero-arg|.
---
--- @param timer integer
--- @param paused boolean
--- @return any
function vim.fn.timer_pause(timer, paused) end

--- Create a timer and return the timer ID.
---
--- {time} is the waiting time in milliseconds.  This is the
--- minimum time before invoking the callback.  When the system is
--- busy or Vim is not waiting for input the time will be longer.
--- Zero can be used to execute the callback when Vim is back in
--- the main loop.
---
--- {callback} is the function to call.  It can be the name of a
--- function or a |Funcref|.  It is called with one argument, which
--- is the timer ID.  The callback is only invoked when Vim is
--- waiting for input.
---
--- {options} is a dictionary.  Supported entries:
---    "repeat"  Number of times to repeat the callback.
---     -1 means forever.  Default is 1.
---     If the timer causes an error three times in a
---     row the repeat is cancelled.
---
--- Returns -1 on error.
---
--- Example: >vim
---   func MyHandler(timer)
---     echo 'Handler called'
---   endfunc
---   let timer = timer_start(500, 'MyHandler',
---     \ {'repeat': 3})
--- <This invokes MyHandler() three times at 500 msec intervals.
---
--- @param time number
--- @param callback string|function
--- @param options? table
--- @return any
function vim.fn.timer_start(time, callback, options) end

--- Stop a timer.  The timer callback will no longer be invoked.
--- {timer} is an ID returned by |timer_start()|, thus it must be a
--- Number.  If {timer} does not exist there is no error.
---
--- @param timer integer
--- @return any
function vim.fn.timer_stop(timer) end

--- Stop all timers.  The timer callbacks will no longer be
--- invoked.  Useful if some timers is misbehaving.  If there are
--- no timers there is no error.
---
--- @return any
function vim.fn.timer_stopall() end

--- Converts a String to lowercase (like applying |gu|).
--- Returns empty string on error.
---
--- @param expr string
--- @return string
function vim.fn.tolower(expr) end

--- Converts a String to uppercase (like applying |gU|).
--- Returns empty string on error.
---
--- @param expr string
--- @return string
function vim.fn.toupper(expr) end

--- Translates characters in {src}, replacing each character that
--- appears in {fromstr} with the corresponding character in
--- {tostr}.  Exactly like the unix "tr" command.
--- This code also deals with multibyte characters properly.
---
--- Returns an empty string on error.
---
--- Examples: >vim
---   echo tr("hello there", "ht", "HT")
--- <returns "Hello THere" >vim
---   echo tr("<blob>", "<>", "{}")
--- <returns "{blob}"
---
--- @param src string
--- @param fromstr string
--- @param tostr string
--- @return string
function vim.fn.tr(src, fromstr, tostr) end

--- Return {text} as a String where any character in {mask} is
--- removed from the beginning and/or end of {text}.
---
--- If {mask} is not given, or is an empty string, {mask} is all
--- characters up to 0x20, which includes Tab, space, NL and CR,
--- plus the non-breaking space character 0xa0.
---
--- The optional {dir} argument specifies where to remove the
--- characters:
---   0  remove from the beginning and end of {text}
---   1  remove only at the beginning of {text}
---   2  remove only at the end of {text}
--- When omitted both ends are trimmed.
---
--- This function deals with multibyte characters properly.
--- Returns an empty string on error.
---
--- Examples: >vim
---   echo trim("   some text ")
--- <returns "some text" >vim
---   echo trim("  \r\t\t\r RESERVE \t\n\x0B\xA0") .. "_TAIL"
--- <returns "RESERVE_TAIL" >vim
---   echo trim("rm<Xrm<>X>rrm", "rm<>")
--- <returns "Xrm<>X" (characters in the middle are not removed) >vim
---   echo trim("  vim  ", " ", 2)
--- <returns "  vim"
---
--- @param text string
--- @param mask? string
--- @param dir? 0|1|2
--- @return string
function vim.fn.trim(text, mask, dir) end

--- Return the largest integral value with magnitude less than or
--- equal to {expr} as a |Float| (truncate towards zero).
--- {expr} must evaluate to a |Float| or a |Number|.
--- Returns 0.0 if {expr} is not a |Float| or a |Number|.
--- Examples: >vim
---   echo trunc(1.456)
--- <  1.0  >vim
---   echo trunc(-5.456)
--- <  -5.0  >vim
---   echo trunc(4.0)
--- <  4.0
---
--- @param expr number
--- @return integer
function vim.fn.trunc(expr) end

--- Returns the type of {expr} as a Number.
--- Instead of using the number directly, it is better to use the
--- v:t_ variable that has the value:
---   Number:      0  |v:t_number|
---   String:      1  |v:t_string|
---   Funcref:    2  |v:t_func|
---   List:      3  |v:t_list|
---   Dictionary: 4  |v:t_dict|
---   Float:      5  |v:t_float|
---   Boolean:    6  |v:t_bool| (|v:false| and |v:true|)
---   Null:      7  (|v:null|)
---   Blob:     10  |v:t_blob|
--- For backward compatibility, this method can be used: >vim
---   if type(myvar) == type(0) | endif
---   if type(myvar) == type("") | endif
---   if type(myvar) == type(function("tr")) | endif
---   if type(myvar) == type([]) | endif
---   if type(myvar) == type({}) | endif
---   if type(myvar) == type(0.0) | endif
---   if type(myvar) == type(v:true) | endif
--- <In place of checking for |v:null| type it is better to check
--- for |v:null| directly as it is the only value of this type: >vim
---   if myvar is v:null | endif
--- <To check if the v:t_ variables exist use this: >vim
---   if exists('v:t_number') | endif
--- <
---
--- @param expr any
--- @return integer
function vim.fn.type(expr) end

--- Return the name of the undo file that would be used for a file
--- with name {name} when writing.  This uses the 'undodir'
--- option, finding directories that exist.  It does not check if
--- the undo file exists.
--- {name} is always expanded to the full path, since that is what
--- is used internally.
--- If {name} is empty undofile() returns an empty string, since a
--- buffer without a file name will not write an undo file.
--- Useful in combination with |:wundo| and |:rundo|.
---
--- @param name string
--- @return string
function vim.fn.undofile(name) end

--- Return the current state of the undo tree for the current
--- buffer, or for a specific buffer if {buf} is given.  The
--- result is a dictionary with the following items:
---   "seq_last"  The highest undo sequence number used.
---   "seq_cur"  The sequence number of the current position in
---     the undo tree.  This differs from "seq_last"
---     when some changes were undone.
---   "time_cur"  Time last used for |:earlier| and related
---     commands.  Use |strftime()| to convert to
---     something readable.
---   "save_last"  Number of the last file write.  Zero when no
---     write yet.
---   "save_cur"  Number of the current position in the undo
---     tree.
---   "synced"  Non-zero when the last undo block was synced.
---     This happens when waiting from input from the
---     user.  See |undo-blocks|.
---   "entries"  A list of dictionaries with information about
---     undo blocks.
---
--- The first item in the "entries" list is the oldest undo item.
--- Each List item is a |Dictionary| with these items:
---   "seq"    Undo sequence number.  Same as what appears in
---     |:undolist|.
---   "time"  Timestamp when the change happened.  Use
---     |strftime()| to convert to something readable.
---   "newhead"  Only appears in the item that is the last one
---     that was added.  This marks the last change
---     and where further changes will be added.
---   "curhead"  Only appears in the item that is the last one
---     that was undone.  This marks the current
---     position in the undo tree, the block that will
---     be used by a redo command.  When nothing was
---     undone after the last change this item will
---     not appear anywhere.
---   "save"  Only appears on the last block before a file
---     write.  The number is the write count.  The
---     first write has number 1, the last one the
---     "save_last" mentioned above.
---   "alt"    Alternate entry.  This is again a List of undo
---     blocks.  Each item may again have an "alt"
---     item.
---
--- @param buf? integer|string
--- @return vim.fn.undotree.ret
function vim.fn.undotree(buf) end

--- Lua: Prefer |vim.list.unique()|.
---
--- Remove second and succeeding copies of repeated adjacent
--- {list} items in-place.  Returns {list}.  If you want a list
--- to remain unmodified make a copy first: >vim
---   let newlist = uniq(copy(mylist))
--- <The default compare function uses the string representation of
--- each item.  For the use of {func} and {dict} see |sort()|.
--- For deduplicating text in the current buffer see |:uniq|.
---
--- Returns zero if {list} is not a |List|.
---
--- @param list any
--- @param func? any
--- @param dict? any
--- @return any[]|0
function vim.fn.uniq(list, func, dict) end

--- Same as |charidx()| but returns the UTF-16 code unit index of
--- the byte at {idx} in {string} (after converting it to UTF-16).
---
--- When {charidx} is present and TRUE, {idx} is used as the
--- character index in the String {string} instead of as the byte
--- index.
--- An {idx} in the middle of a UTF-8 sequence is rounded
--- downwards to the beginning of that sequence.
---
--- Returns -1 if the arguments are invalid or if there are less
--- than {idx} bytes in {string}.  If there are exactly {idx}
--- bytes, the length of the string in UTF-16 code units is
--- returned.
---
--- See |byteidx()| and |byteidxcomp()| for getting the byte index
--- from the UTF-16 index and |charidx()| for getting the
--- character index from the UTF-16 index.
--- Refer to |string-offset-encoding| for more information.
--- Examples: >vim
---   echo utf16idx('a😊😊', 3)  " returns 2
---   echo utf16idx('a😊😊', 7)  " returns 4
---   echo utf16idx('a😊😊', 1, 0, 1)  " returns 2
---   echo utf16idx('a😊😊', 2, 0, 1)  " returns 4
---   echo utf16idx('aą́c', 6)    " returns 2
---   echo utf16idx('aą́c', 6, 1)  " returns 4
---   echo utf16idx('a😊😊', 9)  " returns -1
--- <
---
--- @param string string
--- @param idx integer
--- @param countcc? boolean
--- @param charidx? boolean
--- @return integer
function vim.fn.utf16idx(string, idx, countcc, charidx) end

--- Return a |List| with all the values of {dict}.  The |List| is
--- in arbitrary order.  Also see |items()| and |keys()|.
--- Returns zero if {dict} is not a |Dict|.
---
--- @param dict any
--- @return any
function vim.fn.values(dict) end

--- Returns the virtual (screen) column of the file position
--- given with {expr}.  That is, the total number of screen cells
--- occupied by the part of the line until the end of the
--- character at that position.  When there is a <Tab> at the
--- position, the returned Number will be the column at the end of
--- the <Tab>.  For example, for a <Tab> in column 1, with 'ts'
--- set to 8, it returns 8.  |conceal| is ignored.
--- For the byte position use |col()|.
---
--- For the use of {expr} see |getpos()| and |col()|.
--- When {expr} is "$", it means the end of the cursor line, so
--- the result is the number of cells in the cursor line plus one.
---
--- When 'virtualedit' is used {expr} can be [lnum, col, off],
--- where "off" is the offset in screen columns from the start of
--- the character.  E.g., a position within a <Tab> or after the
--- last character.  When "off" is omitted zero is used.  When
--- Virtual editing is active in the current mode, a position
--- beyond the end of the line can be returned.  Also see
--- 'virtualedit'
---
--- If {list} is present and non-zero then virtcol() returns a
--- List with the first and last screen position occupied by the
--- character.
---
--- With the optional {winid} argument the values are obtained for
--- that window instead of the current window.
---
--- Note that only marks in the current file can be used.
--- Examples: >vim
---   " With text "foo^Lbar" and cursor on the "^L":
---
---   echo virtcol(".")  " returns 5
---   echo virtcol(".", 1)  " returns [4, 5]
---   echo virtcol("$")  " returns 9
---
---   " With text "    there", with 't at 'h':
---
---   echo virtcol("'t")  " returns 6
--- <
--- The first column is 1.  0 or [0, 0] is returned for an error.
---
--- A more advanced example that echoes the maximum length of
--- all lines: >vim
---     echo max(map(range(1, line('$')), "virtcol([v:val, '$'])"))
--- <
---
--- @param expr string|any[]
--- @param list? boolean
--- @param winid? integer
--- @return integer|[integer, integer]
function vim.fn.virtcol(expr, list, winid) end

--- Converts a virtual column to a byte index.  Returns the byte
--- index of the character in window {winid} at buffer line
--- {lnum} and virtual column {col}.
---
--- If buffer line {lnum} is an empty line, 0 is returned.
---
--- If {col} is greater than the last virtual column in line
--- {lnum}, then the byte index of the character at the last
--- virtual column is returned.
---
--- For a multi-byte character, the column number of the first
--- byte in the character is returned.
---
--- The {winid} argument can be the window number or the
--- |window-ID|.  If this is zero, then the current window is used.
---
--- Returns -1 if the window {winid} doesn't exist or the buffer
--- line {lnum} or virtual column {col} is invalid.
---
--- See also |screenpos()|, |virtcol()| and |col()|.
---
--- @param winid integer
--- @param lnum integer
--- @param col integer
--- @return integer
function vim.fn.virtcol2col(winid, lnum, col) end

--- Returns a String describing the last Visual mode used in the
--- current buffer.  Initially it returns an empty string, but
--- once Visual mode has been used, it returns "v",
--- "V", or "<CTRL-V>" (a single CTRL-V character) for
--- character-wise, line-wise, or block-wise Visual mode
--- respectively.
--- Example: >vim
---   exe "normal " .. visualmode()
--- <This enters the same Visual mode as before.  It is also useful
--- in scripts if you wish to act differently depending on the
--- Visual mode that was used.
--- If Visual mode is active, use |mode()| to get the Visual mode
--- (e.g., in a |:vmap|).
--- If {expr} is supplied and it evaluates to a non-zero Number or
--- a non-empty String, then the Visual mode will be cleared and
--- the old value is returned.  See |non-zero-arg|.
---
--- @param expr? boolean
--- @return string
function vim.fn.visualmode(expr) end

--- Waits until {condition} evaluates to |TRUE|, where {condition}
--- is a |Funcref| or |string| containing an expression.
---
--- {timeout} is the maximum waiting time in milliseconds, -1
--- means forever.
---
--- Condition is evaluated on user events, internal events, and
--- every {interval} milliseconds (default: 200).
---
--- Returns a status integer:
---   0 if the condition was satisfied before timeout
---   -1 if the timeout was exceeded
---   -2 if the function was interrupted (by |CTRL-C|)
---   -3 if an error occurred
---
--- @param timeout integer
--- @param condition any
--- @param interval? number
--- @return any
function vim.fn.wait(timeout, condition, interval) end

--- Returns |TRUE| when the wildmenu is active and |FALSE|
--- otherwise.  See 'wildmenu' and 'wildmode'.
--- This can be used in mappings to handle the 'wildcharm' option
--- gracefully.  (Makes only sense with |mapmode-c| mappings).
---
--- For example to make <c-j> work like <down> in wildmode, use: >vim
---     cnoremap <expr> <C-j> wildmenumode() ? "\<Down>\<Tab>" : "\<c-j>"
--- <
--- (Note: this needs the 'wildcharm' option set appropriately).
---
--- @return any
function vim.fn.wildmenumode() end

--- Start wildcard expansion in the command-line, using the
--- behavior defined by the 'wildmode' and 'wildoptions' settings.
---
--- This function also enables completion in search patterns such
--- as |/|, |?|, |:s|, |:g|, |:v| and |:vimgrep|.
---
--- Unlike pressing 'wildchar' manually, this function does not
--- produce a beep when no matches are found and generally
--- operates more quietly.  This makes it suitable for triggering
--- completion automatically.
---
--- Note: After navigating command-line history, the first call to
--- wildtrigger() is a no-op; a second call is needed to start
--- expansion.  This is to support history navigation in
--- command-line autocompletion.
---
--- See |cmdline-autocompletion|.
---
--- Return value is always 0.
---
--- @return number
function vim.fn.wildtrigger() end

--- Like `execute()` but in the context of window {id}.
--- The window will temporarily be made the current window,
--- without triggering autocommands or changing directory.  When
--- executing {command} autocommands will be triggered, this may
--- have unexpected side effects.  Use `:noautocmd` if needed.
--- Example: >vim
---   call win_execute(winid, 'syntax enable')
--- <Doing the same with `setwinvar()` would not trigger
--- autocommands and not actually show syntax highlighting.
---
--- When window {id} does not exist then no error is given and
--- an empty string is returned.
---
--- @param id integer
--- @param command string
--- @param silent? boolean
--- @return any
function vim.fn.win_execute(id, command, silent) end

--- Returns a |List| with |window-ID|s for windows that contain
--- buffer {bufnr}.  When there is none the list is empty.
---
--- @param bufnr integer
--- @return integer[]
function vim.fn.win_findbuf(bufnr) end

--- Get the |window-ID| for the specified window.
--- When {win} is missing use the current window.
--- With {win} this is the window number.  The top window has
--- number 1.
--- Without {tab} use the current tab, otherwise the tab with
--- number {tab}.  The first tab has number one.
--- Return zero if the window cannot be found.
---
--- @param win? integer
--- @param tab? integer
--- @return integer
function vim.fn.win_getid(win, tab) end

--- Return the type of the window:
---   "autocmd"  autocommand window.  Temporary window
---       used to execute autocommands.
---   "command"  command-line window |cmdwin|
---   (empty)    normal window
---   "loclist"  |location-list-window|
---   "popup"    floating window |api-floatwin|
---   "preview"  preview window |preview-window|
---   "quickfix"  |quickfix-window|
---   "unknown"  window {nr} not found
---
--- When {nr} is omitted return the type of the current window.
--- When {nr} is given return the type of this window by number or
--- |window-ID|.
---
--- Also see the 'buftype' option.
---
--- @param nr? integer
--- @return 'autocmd'|'command'|''|'loclist'|'popup'|'preview'|'quickfix'|'unknown'
function vim.fn.win_gettype(nr) end

--- Go to window with ID {expr}.  This may also change the current
--- tabpage.
--- Return TRUE if successful, FALSE if the window cannot be
--- found.
---
--- @param expr integer
--- @return 0|1
function vim.fn.win_gotoid(expr) end

--- Return a list with the tab number and window number of window
--- with ID {expr}: [tabnr, winnr].
--- Return [0, 0] if the window cannot be found.
---
--- @param expr integer
--- @return any
function vim.fn.win_id2tabwin(expr) end

--- Return the window number of window with ID {expr}.
--- Return 0 if the window cannot be found in the current tabpage.
---
--- @param expr integer
--- @return integer
function vim.fn.win_id2win(expr) end

--- Move window {nr}'s vertical separator (i.e., the right border)
--- by {offset} columns, as if being dragged by the mouse.  {nr}
--- can be a window number or |window-ID|.  A positive {offset}
--- moves right and a negative {offset} moves left.  Moving a
--- window's vertical separator will change the width of the
--- window and the width of other windows adjacent to the vertical
--- separator.  The magnitude of movement may be smaller than
--- specified (e.g., as a consequence of maintaining
--- 'winminwidth').  Returns TRUE if the window can be found and
--- FALSE otherwise.
--- This will fail for the rightmost window and a full-width
--- window, since it has no separator on the right.
--- Only works for the current tab page. *E1308*
---
--- @param nr integer
--- @param offset integer
--- @return any
function vim.fn.win_move_separator(nr, offset) end

--- Move window {nr}'s status line (i.e., the bottom border) by
--- {offset} rows, as if being dragged by the mouse.  {nr} can be
--- a window number or |window-ID|.  A positive {offset} moves
--- down and a negative {offset} moves up.  Moving a window's
--- status line will change the height of the window and the
--- height of other windows adjacent to the status line. The
--- magnitude of movement may be smaller than specified (e.g., as
--- a consequence of maintaining 'winminheight'). Returns TRUE if
--- the window can be found and FALSE otherwise.
--- Only works for the current tab page.
---
--- @param nr integer
--- @param offset integer
--- @return any
function vim.fn.win_move_statusline(nr, offset) end

--- Return the screen position of window {nr} as a list with two
--- numbers: [row, col].  The first window always has position
--- [1, 1], unless there is a tabline, then it is [2, 1].
--- {nr} can be the window number or the |window-ID|.  Use zero
--- for the current window.
--- Returns [0, 0] if the window cannot be found.
---
--- @param nr integer
--- @return any
function vim.fn.win_screenpos(nr) end

--- Temporarily switch to window {target}, then move window {nr}
--- to a new split adjacent to {target}.
--- Unlike commands such as |:split|, no new windows are created
--- (the |window-ID| of window {nr} is unchanged after the move).
---
--- Both {nr} and {target} can be window numbers or |window-ID|s.
--- Both must be in the current tab page.
---
--- Returns zero for success, non-zero for failure.
---
--- {options} is a |Dictionary| with the following optional entries:
---   "vertical"  When TRUE, the split is created vertically,
---     like with |:vsplit|.
---   "rightbelow"  When TRUE, the split is made below or to the
---     right (if vertical).  When FALSE, it is done
---     above or to the left (if vertical).  When not
---     present, the values of 'splitbelow' and
---     'splitright' are used.
---
--- @param nr integer
--- @param target integer
--- @param options? table
--- @return any
function vim.fn.win_splitmove(nr, target, options) end

--- Returns the buffer number associated with window {nr}.
--- {nr} can be the window number or the |window-ID|.
--- When {nr} is zero, the number of the buffer in the current
--- window is returned.
--- When window {nr} doesn't exist, -1 is returned.
--- Example: >vim
---   echo "The file in the current window is " .. bufname(winbufnr(0))
--- <
---
--- @param nr integer
--- @return integer
function vim.fn.winbufnr(nr) end

--- Returns the virtual column of the cursor in the window.
--- This is counting screen cells from the left side of the
--- window.  The leftmost column is one.
---
--- @return integer
function vim.fn.wincol() end

--- Returns the Windows OS version as a String.  E.g, Windows 10
--- is "10.0", Windows 8 is "6.2", Windows XP is "5.1".  For
--- non-MS-Windows systems the result is an empty string.
---
--- Lua: see |uv.os_uname()|.
---
--- @return string
function vim.fn.windowsversion() end

--- Gets the height of |window-ID| {nr} (zero for "current
--- window"), excluding any 'winbar' and 'statusline'. Returns -1
--- if window {nr} doesn't exist. An existing window always has
--- a height of zero or more.
---
--- Examples: >vim
---   echo "Current window has " .. winheight(0) .. " lines."
--- <
---
--- @param nr integer
--- @return integer
function vim.fn.winheight(nr) end

--- Returns the layout of windows in a tabpage as a nested List.
---
--- Without {tabnr} use the current tabpage, otherwise the tabpage
--- with number {tabnr}.  If the tabpage {tabnr} is not found,
--- returns an empty list.
---
--- For a leaf window, it returns: >
---   ["leaf", {winid}]
--- <
--- For horizontally split windows, which form a column, it
--- returns: >
---   ["col", [{nested list of windows}]]
--- <For vertically split windows, which form a row, it returns: >
---   ["row", [{nested list of windows}]]
--- <
--- Example: >vim
---   " Only one window in the tab page
---   echo winlayout()
--- < >
---   ['leaf', 1000]
--- < >vim
---   " Two horizontally split windows
---   echo winlayout()
--- < >
---   ['col', [['leaf', 1000], ['leaf', 1001]]]
--- < >vim
---   " The second tab page, with three horizontally split
---   " windows, with two vertically split windows in the
---   " middle window
---   echo winlayout(2)
--- < >
---   ['col', [['leaf', 1002], ['row', [['leaf', 1003],
---           ['leaf', 1001]]], ['leaf', 1000]]]
--- <
---
--- @param tabnr? integer
--- @return vim.fn.winlayout.ret
function vim.fn.winlayout(tabnr) end

--- Returns the screen line of the cursor in the window.  This is
--- counting screen lines from the top of the window.  The first
--- line is one.
--- If the cursor was moved the view on the file will be updated
--- first, this may cause a scroll.
---
--- @return integer
function vim.fn.winline() end

--- Returns the number of the current window.  The top window has
--- number 1.  Returns zero for a hidden or non |focusable|
--- window, unless it is the current window.
---
--- The optional argument {arg} supports the following values:
---   $  the number of the last window (the window
---     count).
---   #  the number of the last accessed window (where
---     |CTRL-W_p| goes to).  If there is no previous
---     window or it is in another tab page 0 is
---     returned.  May refer to the current window in
---     some cases (e.g. when evaluating 'statusline'
---     expressions).
---   {N}j  the number of the Nth window below the
---     current window (where |CTRL-W_j| goes to).
---   {N}k  the number of the Nth window above the current
---     window (where |CTRL-W_k| goes to).
---   {N}h  the number of the Nth window left of the
---     current window (where |CTRL-W_h| goes to).
---   {N}l  the number of the Nth window right of the
---     current window (where |CTRL-W_l| goes to).
--- The number can be used with |CTRL-W_w| and ":wincmd w"
--- |:wincmd|.
--- When {arg} is invalid an error is given and zero is returned.
--- Also see |tabpagewinnr()| and |win_getid()|.
--- Examples: >vim
---   let window_count = winnr('$')
---   let prev_window = winnr('#')
---   let wnum = winnr('3k')
--- <
---
--- @param arg? string|integer
--- @return integer
function vim.fn.winnr(arg) end

--- Returns a sequence of |:resize| commands that should restore
--- the current window sizes.  Only works properly when no windows
--- are opened or closed and the current window and tab page is
--- unchanged.
--- Example: >vim
---   let cmd = winrestcmd()
---   call MessWithWindowSizes()
---   exe cmd
--- <
---
--- @return string
function vim.fn.winrestcmd() end

--- Uses the |Dictionary| returned by |winsaveview()| to restore
--- the view of the current window.
--- Note: The {dict} does not have to contain all values, that are
--- returned by |winsaveview()|.  If values are missing, those
--- settings won't be restored.  So you can use: >vim
---     call winrestview({'curswant': 4})
--- <
--- This will only set the curswant value (the column the cursor
--- wants to move on vertical movements) of the cursor to column 5
--- (yes, that is 5), while all other settings will remain the
--- same.  This is useful, if you set the cursor position
--- manually.
---
--- If you have changed the values the result is unpredictable.
--- If the window size changed the result won't be the same.
---
--- @param dict vim.fn.winrestview.dict
--- @return any
function vim.fn.winrestview(dict) end

--- Returns a |Dictionary| that contains information to restore
--- the view of the current window.  Use |winrestview()| to
--- restore the view.
--- This is useful if you have a mapping that jumps around in the
--- buffer and you want to go back to the original view.
--- This does not save fold information.  Use the 'foldenable'
--- option to temporarily switch off folding, so that folds are
--- not opened when moving around.  This may have side effects.
--- The return value includes:
---   lnum    cursor line number
---   col    cursor column (Note: the first column
---       zero, as opposed to what |getcurpos()|
---       returns)
---   coladd    cursor column offset for 'virtualedit'
---   curswant  column for vertical movement (Note:
---       the first column is zero, as opposed
---       to what |getcurpos()| returns).  After
---       |$| command it will be a very large
---       number equal to |v:maxcol|.
---   topline    first line in the window
---   topfill    filler lines, only in diff mode
---   leftcol    first column displayed; only used when
---       'wrap' is off
---   skipcol    columns skipped
--- Note that no option values are saved.
---
--- @return vim.fn.winsaveview.ret
function vim.fn.winsaveview() end

--- Gets the width of |window-ID| {nr} (zero for "current
--- window"), including columns (|sign-column|, 'statuscolumn',
--- etc.). Returns -1 if window {nr} doesn't exist. An existing
--- window always has a width of zero or more.
---
--- Example: >vim
---   echo "Current window has " .. winwidth(0) .. " columns."
---   if winwidth(0) <= 50
---     50 wincmd |
---   endif
--- <
--- To get the buffer "viewport", use |getwininfo()|: >vim
---     :echo getwininfo(win_getid())[0].width - getwininfo(win_getid())[0].textoff
--- <
--- To get the Nvim screen size, see the 'columns' option.
---
--- @param nr integer
--- @return integer
function vim.fn.winwidth(nr) end

--- Returns a dictionary of byte/chars/word statistics for the
--- current buffer.  This is the same info provided by |g_CTRL-G|.
--- The return value includes:
---   bytes    Number of bytes in the buffer
---   chars    Number of chars in the buffer
---   words    Number of words in the buffer
---   cursor_bytes    Number of bytes before cursor position
---       (not in Visual mode)
---   cursor_chars    Number of chars before cursor position
---       (not in Visual mode)
---   cursor_words    Number of words before cursor position
---       (not in Visual mode)
---   visual_bytes    Number of bytes visually selected
---       (only in Visual mode)
---   visual_chars    Number of chars visually selected
---       (only in Visual mode)
---   visual_words    Number of words visually selected
---       (only in Visual mode)
---
--- @return any
function vim.fn.wordcount() end

--- When {object} is a |List| write it to file {fname}.  Each list
--- item is separated with a NL.  Each list item must be a String
--- or Number.
--- All NL characters are replaced with a NUL character.
--- Inserting CR characters needs to be done before passing {list}
--- to writefile().
---
--- When {object} is a |Blob| write the bytes to file {fname}
--- unmodified, also when binary mode is not specified.
---
--- {flags} must be a String.  These characters are recognized:
---
--- 'b'  Binary mode is used: There will not be a NL after the
---      last list item.  An empty item at the end does cause the
---      last line in the file to end in a NL.
---
--- 'a'  Append mode is used, lines are appended to the file: >vim
---   call writefile(["foo"], "event.log", "a")
---   call writefile(["bar"], "event.log", "a")
--- <
--- 'D'  Delete the file when the current function ends.  This
---      works like: >vim
---   defer delete({fname})
--- <     Fails when not in a function.  Also see |:defer|.
---
--- 's'  fsync() is called after writing the file.  This flushes
---      the file to disk, if possible.  This takes more time but
---      avoids losing the file if the system crashes.
---
--- 'S'  fsync() is not called, even when 'fsync' is set.
---
---      When {flags} does not contain "S" or "s" then fsync() is
---      called if the 'fsync' option is set.
---
--- An existing file is overwritten, if possible.
---
--- When the write fails -1 is returned, otherwise 0.  There is an
--- error message if the file can't be created or when writing
--- fails.
---
--- Also see |readfile()|.
--- To copy a file byte for byte: >vim
---   let fl = readfile("foo", "b")
---   call writefile(fl, "foocopy", "b")
--- <
---
--- @param object any
--- @param fname string
--- @param flags? string
--- @return any
function vim.fn.writefile(object, fname, flags) end

--- Bitwise XOR on the two arguments.  The arguments are converted
--- to a number.  A List, Dict or Float argument causes an error.
--- Also see `and()` and `or()`.
--- Example: >vim
---   let bits = xor(bits, 0x80)
--- <
---
--- @param expr integer
--- @param expr1 integer
--- @return integer
function vim.fn.xor(expr, expr1) end
