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neovim/runtime/doc/lua.txt
bfredl f31db30975 feat(lua): vim.ui_attach to get ui events from lua 
Co-authored-by: Famiu Haque <famiuhaque@protonmail.com>
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*lua.txt* Nvim
NVIM REFERENCE MANUAL
Lua engine *lua* *Lua*
Type |gO| to see the table of contents.
==============================================================================
INTRODUCTION *lua-intro*
The Lua 5.1 language is builtin and always available. Try this command to get
an idea of what lurks beneath: >
:lua print(vim.inspect(package.loaded))
<
Nvim includes a "standard library" |lua-stdlib| for Lua. It complements the
"editor stdlib" (|builtin-functions| and Ex commands) and the |API|, all of
which can be used from Lua code. A good overview of using Lua in neovim is
given by https://github.com/nanotee/nvim-lua-guide.
The |:source| and |:runtime| commands can run Lua scripts as well as Vim
scripts. Lua modules can be loaded with `require('name')`, which
conventionally returns a table but can return any value.
See |lua-require| for details on how Nvim finds and loads Lua modules.
See |lua-require-example| for an example of how to write and use a module.
==============================================================================
IMPORTING LUA MODULES *lua-require*
Modules are searched for under the directories specified in 'runtimepath', in
the order they appear. Any `.` in the module name is treated as a directory
separator when searching. For a module `foo.bar`, each directory is searched
for `lua/foo/bar.lua`, then `lua/foo/bar/init.lua`. If no files are found,
the directories are searched again for a shared library with a name matching
`lua/foo/bar.?`, where `?` is a list of suffixes (such as `so` or `dll`) derived from
the initial value of |package.cpath|. If still no files are found, Nvim falls
back to Lua's default search mechanism. The first script found is run and
`require()` returns the value returned by the script if any, else `true`.
The return value is cached after the first call to `require()` for each module,
with subsequent calls returning the cached value without searching for, or
executing any script. For further details on `require()`, see the Lua
documentation at https://www.lua.org/manual/5.1/manual.html#pdf-require.
For example, if 'runtimepath' is `foo,bar` and |package.cpath| was
`./?.so;./?.dll` at startup, `require('mod')` searches these paths in order
and loads the first module found:
foo/lua/mod.lua
foo/lua/mod/init.lua
bar/lua/mod.lua
bar/lua/mod/init.lua
foo/lua/mod.so
foo/lua/mod.dll
bar/lua/mod.so
bar/lua/mod.dll
Nvim automatically adjusts |package.path| and |package.cpath| according to the
effective 'runtimepath' value. Adjustment happens whenever 'runtimepath' is
changed. |package.path| is adjusted by simply appending `/lua/?.lua` and
`/lua/?/init.lua` to each directory from 'runtimepath' (`/` is actually the
first character of `package.config`).
Similarly to |package.path|, modified directories from 'runtimepath' are also
added to |package.cpath|. In this case, instead of appending `/lua/?.lua` and
`/lua/?/init.lua` to each runtimepath, all unique `?`-containing suffixes of
the existing |package.cpath| are used. Example:
1. Given that
- 'runtimepath' contains `/foo/bar,/xxx;yyy/baz,/abc`;
- initial (defined at compile-time or derived from
`$LUA_CPATH`/`$LUA_INIT`) |package.cpath| contains
`./?.so;/def/ghi/a?d/j/g.elf;/def/?.so`.
2. It finds `?`-containing suffixes `/?.so`, `/a?d/j/g.elf` and `/?.so`, in
order: parts of the path starting from the first path component containing
question mark and preceding path separator.
3. The suffix of `/def/?.so`, namely `/?.so` is not unique, as it’s the same
as the suffix of the first path from |package.path| (i.e. `./?.so`). Which
leaves `/?.so` and `/a?d/j/g.elf`, in this order.
4. 'runtimepath' has three paths: `/foo/bar`, `/xxx;yyy/baz` and `/abc`. The
second one contains a semicolon which is a paths separator so it is out,
leaving only `/foo/bar` and `/abc`, in order.
5. The cartesian product of paths from 4. and suffixes from 3. is taken,
giving four variants. In each variant, a `/lua` path segment is inserted
between path and suffix, leaving:
- `/foo/bar/lua/?.so`
- `/foo/bar/lua/a?d/j/g.elf`
- `/abc/lua/?.so`
- `/abc/lua/a?d/j/g.elf`
6. New paths are prepended to the original |package.cpath|.
The result will look like this:
`/foo/bar,/xxx;yyy/baz,/abc` ('runtimepath')
× `./?.so;/def/ghi/a?d/j/g.elf;/def/?.so` (`package.cpath`)
= `/foo/bar/lua/?.so;/foo/bar/lua/a?d/j/g.elf;/abc/lua/?.so;/abc/lua/a?d/j/g.elf;./?.so;/def/ghi/a?d/j/g.elf;/def/?.so`
Note:
- To track 'runtimepath' updates, paths added at previous update are
remembered and removed at the next update, while all paths derived from the
new 'runtimepath' are prepended as described above. This allows removing
paths when path is removed from 'runtimepath', adding paths when they are
added and reordering |package.path|/|package.cpath| content if 'runtimepath'
was reordered.
- Although adjustments happen automatically, Nvim does not track current
values of |package.path| or |package.cpath|. If you happen to delete some
paths from there you can set 'runtimepath' to trigger an update: >
let &runtimepath = &runtimepath
- Skipping paths from 'runtimepath' which contain semicolons applies both to
|package.path| and |package.cpath|. Given that there are some badly written
plugins using shell, which will not work with paths containing semicolons,
it is better to not have them in 'runtimepath' at all.
==============================================================================
Lua Syntax Information *lua-syntax-help*
While Lua has a simple syntax, there are a few things to understand,
particularly when looking at the documentation above.
*lua-syntax-call-function*
Lua functions can be called in multiple ways. Consider the function: >
local example_func = function(a, b)
print("A is: ", a)
print("B is: ", b)
end
<
The first way to call this function is: >
example_func(1, 2)
-- ==== Result ====
-- A is: 1
-- B is: 2
<
This way of calling a function is familiar from most scripting languages.
In Lua, it's important to understand that any function arguments that are
not supplied are automatically set to `nil`. For example: >
example_func(1)
-- ==== Result ====
-- A is: 1
-- B is: nil
<
Additionally, if any extra parameters are passed, they are discarded
completely.
In Lua, it is also possible to omit the parentheses (only) if the function
takes a single string or table literal (`"foo"` or "`{1,2,3}`", respectively).
The latter is most often used to approximate "keyword-style" arguments with a
single dictionary, for example: >
local func_with_opts = function(opts)
local will_do_foo = opts.foo
local filename = opts.filename
...
end
func_with_opts { foo = true, filename = "hello.world" }
<
In this style, each "parameter" is passed via keyword. It is still valid
to call the function in the standard style: >
func_with_opts({ foo = true, filename = "hello.world" })
<
But often in the documentation, you will see the former rather than the
latter style due to its brevity.
==============================================================================
Lua Patterns *lua-patterns*
For performance reasons, Lua does not support regular expressions natively.
Instead, the Lua `string` standard library allows manipulations using a
restricted set of "patterns", see |luaref-patterns|.
Examples (`string.match` extracts the first match): >
print(string.match("foo123bar123", "%d+"))
-- -> 123
print(string.match("foo123bar123", "[^%d]+"))
-- -> foo
print(string.match("foo123bar123", "[abc]+"))
-- -> ba
print(string.match("foo.bar", "%.bar"))
-- -> .bar
For more complex matching, Vim regular expressions can be used from Lua
through |vim.regex()|.
------------------------------------------------------------------------------
LUA PLUGIN EXAMPLE *lua-require-example*
The following example plugin adds a command `:MakeCharBlob` which transforms
current buffer into a long `unsigned char` array. Lua contains transformation
function in a module `lua/charblob.lua` which is imported in
`autoload/charblob.vim` (`require("charblob")`). Example plugin is supposed
to be put into any directory from 'runtimepath', e.g. `~/.config/nvim` (in
this case `lua/charblob.lua` means `~/.config/nvim/lua/charblob.lua`).
autoload/charblob.vim: >
function charblob#encode_buffer()
call setline(1, luaeval(
\ 'require("charblob").encode(unpack(_A))',
\ [getline(1, '$'), &textwidth, ' ']))
endfunction
<
plugin/charblob.vim: >
if exists('g:charblob_loaded')
finish
endif
let g:charblob_loaded = 1
command MakeCharBlob :call charblob#encode_buffer()
<
lua/charblob.lua: >
local function charblob_bytes_iter(lines)
local init_s = {
next_line_idx = 1,
next_byte_idx = 1,
lines = lines,
}
local function next(s, _)
if lines[s.next_line_idx] == nil then
return nil
end
if s.next_byte_idx > #(lines[s.next_line_idx]) then
s.next_line_idx = s.next_line_idx + 1
s.next_byte_idx = 1
return ('\n'):byte()
end
local ret = lines[s.next_line_idx]:byte(s.next_byte_idx)
if ret == ('\n'):byte() then
ret = 0 -- See :h NL-used-for-NUL.
end
s.next_byte_idx = s.next_byte_idx + 1
return ret
end
return next, init_s, nil
end
local function charblob_encode(lines, textwidth, indent)
local ret = {
'const unsigned char blob[] = {',
indent,
}
for byte in charblob_bytes_iter(lines) do
-- .- space + number (width 3) + comma
if #(ret[#ret]) + 5 > textwidth then
ret[#ret + 1] = indent
else
ret[#ret] = ret[#ret] .. ' '
end
ret[#ret] = ret[#ret] .. (('%3u,'):format(byte))
end
ret[#ret + 1] = '};'
return ret
end
return {
bytes_iter = charblob_bytes_iter,
encode = charblob_encode,
}
<
==============================================================================
COMMANDS *lua-commands*
These commands execute a Lua chunk from either the command line (:lua, :luado)
or a file (:luafile) on the given line [range]. As always in Lua, each chunk
has its own scope (closure), so only global variables are shared between
command calls. The |lua-stdlib| modules, user modules, and anything else on
|lua-package-path| are available.
The Lua print() function redirects its output to the Nvim message area, with
arguments separated by " " (space) instead of "\t" (tab).
*:lua*
:lua {chunk}
Executes Lua chunk {chunk}. If {chunk} starts with "=" the rest of the
chunk is evaluated as an expression and printed. `:lua =expr` is
equivalent to `:lua print(vim.inspect(expr))`
Examples: >
:lua vim.api.nvim_command('echo "Hello, Nvim!"')
< To see the Lua version: >
:lua print(_VERSION)
< To see the LuaJIT version: >
:lua =jit.version
<
*:lua-heredoc*
:lua << [endmarker]
{script}
{endmarker}
Executes Lua script {script} from within Vimscript. {endmarker} must NOT
be preceded by whitespace. You can omit [endmarker] after the "<<" and use
a dot "." after {script} (similar to |:append|, |:insert|).
Example: >
function! CurrentLineInfo()
lua << EOF
local linenr = vim.api.nvim_win_get_cursor(0)[1]
local curline = vim.api.nvim_buf_get_lines(
0, linenr - 1, linenr, false)[1]
print(string.format("Current line [%d] has %d bytes",
linenr, #curline))
EOF
endfunction
<
Note that the `local` variables will disappear when the block finishes.
But not globals.
*:luado*
:[range]luado {body}
Executes Lua chunk "function(line, linenr) {body} end" for each buffer
line in [range], where `line` is the current line text (without <EOL>),
and `linenr` is the current line number. If the function returns a string
that becomes the text of the corresponding buffer line. Default [range] is
the whole file: "1,$".
Examples: >
:luado return string.format("%s\t%d", line:reverse(), #line)
:lua require"lpeg"
:lua -- balanced parenthesis grammar:
:lua bp = lpeg.P{ "(" * ((1 - lpeg.S"()") + lpeg.V(1))^0 * ")" }
:luado if bp:match(line) then return "-->\t" .. line end
<
*:luafile*
:luafile {file}
Execute Lua script in {file}.
The whole argument is used as the filename (like |:edit|), spaces do not
need to be escaped. Alternatively you can |:source| Lua files.
Examples: >
:luafile script.lua
:luafile %
<
==============================================================================
luaeval() *lua-eval* *luaeval()*
The (dual) equivalent of "vim.eval" for passing Lua values to Nvim is
"luaeval". "luaeval" takes an expression string and an optional argument used
for _A inside expression and returns the result of the expression. It is
semantically equivalent in Lua to: >
local chunkheader = "local _A = select(1, ...) return "
function luaeval (expstr, arg)
local chunk = assert(loadstring(chunkheader .. expstr, "luaeval"))
return chunk(arg) -- return typval
end
<
Lua nils, numbers, strings, tables and booleans are converted to their
respective Vimscript types. If a Lua string contains a NUL byte, it will be
converted to a |Blob|. Conversion of other Lua types is an error.
The magic global "_A" contains the second argument to luaeval().
Example: >
:echo luaeval('_A[1] + _A[2]', [40, 2])
42
:echo luaeval('string.match(_A, "[a-z]+")', 'XYXfoo123')
foo
<
Lua tables are used as both dictionaries and lists, so it is impossible to
determine whether empty table is meant to be empty list or empty dictionary.
Additionally Lua does not have integer numbers. To distinguish between these
cases there is the following agreement:
0. Empty table is empty list.
1. Table with N incrementally growing integral numbers, starting from 1 and
ending with N is considered to be a list.
2. Table with string keys, none of which contains NUL byte, is considered to
be a dictionary.
3. Table with string keys, at least one of which contains NUL byte, is also
considered to be a dictionary, but this time it is converted to
a |msgpack-special-map|.
*lua-special-tbl*
4. Table with `vim.type_idx` key may be a dictionary, a list or floating-point
value:
- `{[vim.type_idx]=vim.types.float, [vim.val_idx]=1}` is converted to
a floating-point 1.0. Note that by default integral Lua numbers are
converted to |Number|s, non-integral are converted to |Float|s. This
variant allows integral |Float|s.
- `{[vim.type_idx]=vim.types.dictionary}` is converted to an empty
dictionary, `{[vim.type_idx]=vim.types.dictionary, [42]=1, a=2}` is
converted to a dictionary `{'a': 42}`: non-string keys are ignored.
Without `vim.type_idx` key tables with keys not fitting in 1., 2. or 3.
are errors.
- `{[vim.type_idx]=vim.types.array}` is converted to an empty list. As well
as `{[vim.type_idx]=vim.types.array, [42]=1}`: integral keys that do not
form a 1-step sequence from 1 to N are ignored, as well as all
non-integral keys.
Examples: >
:echo luaeval('math.pi')
:function Rand(x,y) " random uniform between x and y
: return luaeval('(_A.y-_A.x)*math.random()+_A.x', {'x':a:x,'y':a:y})
: endfunction
:echo Rand(1,10)
<
Note: Second argument to `luaeval` is converted ("marshalled") from Vimscript
to Lua, so changes to Lua containers do not affect values in Vimscript. Return
value is also always converted. When converting, |msgpack-special-dict|s are
treated specially.
==============================================================================
Vimscript v:lua interface *v:lua-call*
From Vimscript the special `v:lua` prefix can be used to call Lua functions
which are global or accessible from global tables. The expression >
v:lua.func(arg1, arg2)
is equivalent to the Lua chunk >
return func(...)
where the args are converted to Lua values. The expression >
v:lua.somemod.func(args)
is equivalent to the Lua chunk >
return somemod.func(...)
In addition, functions of packages can be accessed like >
v:lua.require'mypack'.func(arg1, arg2)
v:lua.require'mypack.submod'.func(arg1, arg2)
Note: Only single quote form without parens is allowed. Using
`require"mypack"` or `require('mypack')` as prefixes do NOT work (the latter
is still valid as a function call of itself, in case require returns a useful
value).
The `v:lua` prefix may be used to call Lua functions as |method|s. For
example: >
arg1->v:lua.somemod.func(arg2)
<
You can use `v:lua` in "func" options like 'tagfunc', 'omnifunc', etc.
For example consider the following Lua omnifunc handler: >
function mymod.omnifunc(findstart, base)
if findstart == 1 then
return 0
else
return {'stuff', 'steam', 'strange things'}
end
end
vim.api.nvim_buf_set_option(0, 'omnifunc', 'v:lua.mymod.omnifunc')
Note: The module ("mymod" in the above example) must either be a Lua global,
or use the require syntax as specified above to access it from a package.
Note: `v:lua` without a call is not allowed in a Vimscript expression:
|Funcref|s cannot represent Lua functions. The following are errors: >
let g:Myvar = v:lua.myfunc " Error
call SomeFunc(v:lua.mycallback) " Error
let g:foo = v:lua " Error
let g:foo = v:['lua'] " Error
<
==============================================================================
Lua standard modules *lua-stdlib*
The Nvim Lua "standard library" (stdlib) is the `vim` module, which exposes
various functions and sub-modules. It is always loaded, thus `require("vim")`
is unnecessary.
You can peek at the module properties: >
:lua print(vim.inspect(vim))
Result is something like this: >
{
_os_proc_children = <function 1>,
_os_proc_info = <function 2>,
...
api = {
nvim__id = <function 5>,
nvim__id_array = <function 6>,
...
},
deepcopy = <function 106>,
gsplit = <function 107>,
...
}
To find documentation on e.g. the "deepcopy" function: >
:help vim.deepcopy()
Note that underscore-prefixed functions (e.g. "_os_proc_children") are
internal/private and must not be used by plugins.
------------------------------------------------------------------------------
VIM.LOOP *lua-loop* *vim.loop*
`vim.loop` exposes all features of the Nvim event-loop. This is a low-level
API that provides functionality for networking, filesystem, and process
management. Try this command to see available functions: >
:lua print(vim.inspect(vim.loop))
<
Internally, `vim.loop` wraps the "luv" Lua bindings for the LibUV library;
see |luv-intro| for a full reference manual.
*E5560* *lua-loop-callbacks*
It is an error to directly invoke `vim.api` functions (except |api-fast|) in
`vim.loop` callbacks. For example, this is an error: >
local timer = vim.loop.new_timer()
timer:start(1000, 0, function()
vim.api.nvim_command('echomsg "test"')
end)
<
To avoid the error use |vim.schedule_wrap()| to defer the callback: >
local timer = vim.loop.new_timer()
timer:start(1000, 0, vim.schedule_wrap(function()
vim.api.nvim_command('echomsg "test"')
end))
<
(For one-shot timers, see |vim.defer_fn()|, which automatically adds the
wrapping.)
Example: repeating timer
1. Save this code to a file.
2. Execute it with ":luafile %". >
-- Create a timer handle (implementation detail: uv_timer_t).
local timer = vim.loop.new_timer()
local i = 0
-- Waits 1000ms, then repeats every 750ms until timer:close().
timer:start(1000, 750, function()
print('timer invoked! i='..tostring(i))
if i > 4 then
timer:close() -- Always close handles to avoid leaks.
end
i = i + 1
end)
print('sleeping');
<
Example: File-change detection *watch-file*
1. Save this code to a file.
2. Execute it with ":luafile %".
3. Use ":Watch %" to watch any file.
4. Try editing the file from another text editor.
5. Observe that the file reloads in Nvim (because on_change() calls
|:checktime|). >
local w = vim.loop.new_fs_event()
local function on_change(err, fname, status)
-- Do work...
vim.api.nvim_command('checktime')
-- Debounce: stop/start.
w:stop()
watch_file(fname)
end
function watch_file(fname)
local fullpath = vim.api.nvim_call_function(
'fnamemodify', {fname, ':p'})
w:start(fullpath, {}, vim.schedule_wrap(function(...)
on_change(...) end))
end
vim.api.nvim_command(
"command! -nargs=1 Watch call luaeval('watch_file(_A)', expand('<args>'))")
<
Example: TCP echo-server *tcp-server*
1. Save this code to a file.
2. Execute it with ":luafile %".
3. Note the port number.
4. Connect from any TCP client (e.g. "nc 0.0.0.0 36795"): >
local function create_server(host, port, on_connect)
local server = vim.loop.new_tcp()
server:bind(host, port)
server:listen(128, function(err)
assert(not err, err) -- Check for errors.
local sock = vim.loop.new_tcp()
server:accept(sock) -- Accept client connection.
on_connect(sock) -- Start reading messages.
end)
return server
end
local server = create_server('0.0.0.0', 0, function(sock)
sock:read_start(function(err, chunk)
assert(not err, err) -- Check for errors.
if chunk then
sock:write(chunk) -- Echo received messages to the channel.
else -- EOF (stream closed).
sock:close() -- Always close handles to avoid leaks.
end
end)
end)
print('TCP echo-server listening on port: '..server:getsockname().port)
<
Multithreading *lua-loop-threading*
Plugins can perform work in separate (os-level) threads using the threading
APIs in luv, for instance `vim.loop.new_thread`. Note that every thread
gets its own separate lua interpreter state, with no access to lua globals
in the main thread. Neither can the state of the editor (buffers, windows,
etc) be directly accessed from threads.
A subset of the `vim.*` API is available in threads. This includes:
- `vim.loop` with a separate event loop per thread.
- `vim.mpack` and `vim.json` (useful for serializing messages between threads)
- `require` in threads can use lua packages from the global |lua-package-path|
- `print()` and `vim.inspect`
- `vim.diff`
- most utility functions in `vim.*` for working with pure lua values
like `vim.split`, `vim.tbl_*`, `vim.list_*`, and so on.
- `vim.is_thread()` returns true from a non-main thread.
------------------------------------------------------------------------------
VIM.HIGHLIGHT *lua-highlight*
Nvim includes a function for highlighting a selection on yank (see for example
https://github.com/machakann/vim-highlightedyank). To enable it, add
>
au TextYankPost * silent! lua vim.highlight.on_yank()
<
to your `init.vim`. You can customize the highlight group and the duration of
the highlight via
>
au TextYankPost * silent! lua vim.highlight.on_yank {higroup="IncSearch", timeout=150}
<
If you want to exclude visual selections from highlighting on yank, use
>
au TextYankPost * silent! lua vim.highlight.on_yank {on_visual=false}
<
vim.highlight.on_yank({opts}) *vim.highlight.on_yank()*
Highlights the yanked text. The fields of the optional dict {opts}
control the highlight:
- {higroup} highlight group for yanked region (default |hl-IncSearch|)
- {timeout} time in ms before highlight is cleared (default `150`)
- {on_macro} highlight when executing macro (default `false`)
- {on_visual} highlight when yanking visual selection (default `true`)
- {event} event structure (default |v:event|)
vim.highlight.range({bufnr}, {ns}, {hlgroup}, {start}, {finish}, {opts})
*vim.highlight.range()*
Apply highlight group to range of text.
Parameters: ~
{bufnr} buffer number
{ns} namespace for highlights
{hlgroup} highlight group name
{start} starting position (tuple {line,col})
{finish} finish position (tuple {line,col})
{opts} optional parameters:
• `regtype`: type of range (characterwise, linewise,
or blockwise, see |setreg|), default `'v'`
• `inclusive`: range includes end position,
default `false`
• `priority`: priority of highlight, default
`vim.highlight.user` (see below)
vim.highlight.priorities *vim.highlight.priorities*
Table with default priorities used for highlighting:
• `syntax`: `50`, used for standard syntax highlighting
• `treesitter`: `100`, used for tree-sitter-based highlighting
• `diagnostics`: `150`, used for code analysis such as diagnostics
• `user`: `200`, used for user-triggered highlights such as LSP document
symbols or `on_yank` autocommands
------------------------------------------------------------------------------
VIM.REGEX *lua-regex*
Vim regexes can be used directly from lua. Currently they only allow
matching within a single line.
vim.regex({re}) *vim.regex()*
Parse the Vim regex {re} and return a regex object. Regexes are "magic"
and case-sensitive by default, regardless of 'magic' and 'ignorecase'.
They can be controlled with flags, see |/magic| and |/ignorecase|.
Methods on the regex object:
regex:match_str({str}) *regex:match_str()*
Match the string against the regex. If the string should match the regex
precisely, surround the regex with `^` and `$`. If the was a match, the
byte indices for the beginning and end of the match is returned. When
there is no match, `nil` is returned. As any integer is truth-y,
`regex:match()` can be directly used as a condition in an if-statement.
regex:match_line({bufnr}, {line_idx} [, {start}, {end}]) *regex:match_line()*
Match line {line_idx} (zero-based) in buffer {bufnr}. If {start} and {end}
are supplied, match only this byte index range. Otherwise see
|regex:match_str()|. If {start} is used, then the returned byte indices
will be relative {start}.
------------------------------------------------------------------------------
VIM.DIFF *lua-diff*
vim.diff({a}, {b}, {opts}) *vim.diff()*
Run diff on strings {a} and {b}. Any indices returned by this function,
either directly or via callback arguments, are 1-based.
Examples: >
vim.diff('a\n', 'b\nc\n')
-->
@@ -1 +1,2 @@
-a
+b
+c
vim.diff('a\n', 'b\nc\n', {result_type = 'indices'})
-->
{
{1, 1, 1, 2}
}
<
Parameters: ~
{a} First string to compare
{b} Second string to compare
{opts} Optional parameters:
• `on_hunk` (callback):
Invoked for each hunk in the diff. Return a negative number
to cancel the callback for any remaining hunks.
Args:
• `start_a` (integer): Start line of hunk in {a}.
• `count_a` (integer): Hunk size in {a}.
• `start_b` (integer): Start line of hunk in {b}.
• `count_b` (integer): Hunk size in {b}.
• `result_type` (string): Form of the returned diff:
• "unified": (default) String in unified format.
• "indices": Array of hunk locations.
Note: This option is ignored if `on_hunk` is used.
• `algorithm` (string):
Diff algorithm to use. Values:
• "myers" the default algorithm
• "minimal" spend extra time to generate the
smallest possible diff
• "patience" patience diff algorithm
• "histogram" histogram diff algorithm
• `ctxlen` (integer): Context length
• `interhunkctxlen` (integer):
Inter hunk context length
• `ignore_whitespace` (boolean):
Ignore whitespace
• `ignore_whitespace_change` (boolean):
Ignore whitespace change
• `ignore_whitespace_change_at_eol` (boolean)
Ignore whitespace change at end-of-line.
• `ignore_cr_at_eol` (boolean)
Ignore carriage return at end-of-line
• `ignore_blank_lines` (boolean)
Ignore blank lines
• `indent_heuristic` (boolean):
Use the indent heuristic for the internal
diff library.
Return: ~
See {opts.result_type}. nil if {opts.on_hunk} is given.
------------------------------------------------------------------------------
VIM.MPACK *lua-mpack*
The *vim.mpack* module provides encoding and decoding of Lua objects to and
from msgpack-encoded strings. Supports |vim.NIL| and |vim.empty_dict()|.
vim.mpack.encode({obj}) *vim.mpack.encode*
Encodes (or "packs") Lua object {obj} as msgpack in a Lua string.
vim.mpack.decode({str}) *vim.mpack.decode*
Decodes (or "unpacks") the msgpack-encoded {str} to a Lua object.
------------------------------------------------------------------------------
VIM.SPELL *lua-spell*
vim.spell.check({str}) *vim.spell.check()*
Check {str} for spelling errors. Similar to the Vimscript function
|spellbadword()|.
Note: The behaviour of this function is dependent on: 'spelllang',
'spellfile', 'spellcapcheck' and 'spelloptions' which can all be local to
the buffer. Consider calling this with |nvim_buf_call()|.
Example: >
vim.spell.check("the quik brown fox")
-->
{
{'quik', 'bad', 4}
}
<
Parameters: ~
{str} String to spell check.
Return: ~
List of tuples with three items:
- The badly spelled word.
- 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
- The position in {str} where the word begins.
------------------------------------------------------------------------------
VIM *lua-builtin*
vim.api.{func}({...}) *vim.api*
Invokes Nvim |API| function {func} with arguments {...}.
Example: call the "nvim_get_current_line()" API function: >
print(tostring(vim.api.nvim_get_current_line()))
vim.version() *vim.version*
Gets the version of the current Nvim build.
vim.in_fast_event() *vim.in_fast_event()*
Returns true if the code is executing as part of a "fast" event handler,
where most of the API is disabled. These are low-level events (e.g.
|lua-loop-callbacks|) which can be invoked whenever Nvim polls for input.
When this is `false` most API functions are callable (but may be subject
to other restrictions such as |textlock|).
vim.NIL *vim.NIL*
Special value representing NIL in |RPC| and |v:null| in Vimscript
conversion, and similar cases. Lua `nil` cannot be used as part of a Lua
table representing a Dictionary or Array, because it is treated as
missing: `{"foo", nil}` is the same as `{"foo"}`.
vim.empty_dict() *vim.empty_dict()*
Creates a special empty table (marked with a metatable), which Nvim to an
empty dictionary when translating Lua values to Vimscript or API types.
Nvim by default converts an empty table `{}` without this metatable to an
list/array.
Note: If numeric keys are present in the table, Nvim ignores the metatable
marker and converts the dict to a list/array anyway.
vim.rpcnotify({channel}, {method} [, {args}...]) *vim.rpcnotify()*
Sends {event} to {channel} via |RPC| and returns immediately. If {channel}
is 0, the event is broadcast to all channels.
This function also works in a fast callback |lua-loop-callbacks|.
vim.rpcrequest({channel}, {method} [, {args}...]) *vim.rpcrequest()*
Sends a request to {channel} to invoke {method} via |RPC| and blocks until
a response is received.
Note: NIL values as part of the return value is represented as |vim.NIL|
special value
vim.stricmp({a}, {b}) *vim.stricmp()*
Compares strings case-insensitively. Returns 0, 1 or -1 if strings are
equal, {a} is greater than {b} or {a} is lesser than {b}, respectively.
vim.str_utfindex({str} [, {index}]) *vim.str_utfindex()*
Convert byte index to UTF-32 and UTF-16 indices. If {index} is not
supplied, the length of the string is used. All indices are zero-based.
Returns two values: the UTF-32 and UTF-16 indices respectively.
Embedded NUL bytes are treated as terminating the string. Invalid UTF-8
bytes, and embedded surrogates are counted as one code point each. An
{index} in the middle of a UTF-8 sequence is rounded upwards to the end of
that sequence.
vim.str_byteindex({str}, {index} [, {use_utf16}]) *vim.str_byteindex()*
Convert UTF-32 or UTF-16 {index} to byte index. If {use_utf16} is not
supplied, it defaults to false (use UTF-32). Returns the byte index.
Invalid UTF-8 and NUL is treated like by |vim.str_byteindex()|.
An {index} in the middle of a UTF-16 sequence is rounded upwards to
the end of that sequence.
vim.iconv({str}, {from}, {to}[, {opts}]) *vim.iconv()*
The result is a String, which is the text {str} converted from
encoding {from} to encoding {to}. When the conversion fails `nil` 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".
Parameters: ~
{str} (string) Text to convert
{from} (string) Encoding of {str}
{to} (string) Target encoding
Returns: ~
Converted string if conversion succeeds, `nil` otherwise.
vim.schedule({callback}) *vim.schedule()*
Schedules {callback} to be invoked soon by the main event-loop. Useful
to avoid |textlock| or other temporary restrictions.
vim.defer_fn({fn}, {timeout}) *vim.defer_fn*
Defers calling {fn} until {timeout} ms passes. Use to do a one-shot timer
that calls {fn}.
Note: The {fn} is |schedule_wrap|ped automatically, so API functions are
safe to call.
Parameters: ~
{fn} Callback to call once {timeout} expires
{timeout} Time in ms to wait before calling {fn}
Returns: ~
|vim.loop|.new_timer() object
vim.wait({time} [, {callback}, {interval}, {fast_only}]) *vim.wait()*
Wait for {time} in milliseconds until {callback} returns `true`.
Executes {callback} immediately and at approximately {interval}
milliseconds (default 200). Nvim still processes other events during
this time.
Parameters: ~
{time} Number of milliseconds to wait
{callback} Optional callback. Waits until {callback} returns true
{interval} (Approximate) number of milliseconds to wait between polls
{fast_only} If true, only |api-fast| events will be processed.
If called from while in an |api-fast| event, will
automatically be set to `true`.
Returns: ~
If {callback} returns `true` during the {time}:
`true, nil`
If {callback} never returns `true` during the {time}:
`false, -1`
If {callback} is interrupted during the {time}:
`false, -2`
If {callback} errors, the error is raised.
Examples: >
---
-- Wait for 100 ms, allowing other events to process
vim.wait(100, function() end)
---
-- Wait for 100 ms or until global variable set.
vim.wait(100, function() return vim.g.waiting_for_var end)
---
-- Wait for 1 second or until global variable set, checking every ~500 ms
vim.wait(1000, function() return vim.g.waiting_for_var end, 500)
---
-- Schedule a function to set a value in 100ms
vim.defer_fn(function() vim.g.timer_result = true end, 100)
-- Would wait ten seconds if results blocked. Actually only waits 100 ms
if vim.wait(10000, function() return vim.g.timer_result end) then
print('Only waiting a little bit of time!')
end
<
vim.ui_attach({ns}, {options}, {callback}) *vim.ui_attach()*
Attach to ui events, similar to |nvim_ui_attach()| but receive events
as lua callback. Can be used to implement screen elements like
popupmenu or message handling in lua.
{options} should be a dictionary-like table, where `ext_...` options should
be set to true to receive events for the respective external element.
{callback} receives event name plus additional parameters. See |ui-popupmenu|
and the sections below for event format for respective events.
Example (stub for a |ui-popupmenu| implementation): >
ns = vim.api.nvim_create_namespace('my_fancy_pum')
vim.ui_attach(ns, {ext_popupmenu=true}, function(event, ...)
if event == "popupmenu_show" then
local items, selected, row, col, grid = ...
print("display pum ", #items)
elseif event == "popupmenu_select" then
local selected = ...
print("selected", selected)
elseif event == "popupmenu_hide" then
print("FIN")
end
end)
vim.ui_detach({ns}) *vim.ui_detach()*
Detach a callback previously attached with |vim.ui_attach()| for the
given namespace {ns}.
vim.type_idx *vim.type_idx*
Type index for use in |lua-special-tbl|. Specifying one of the values from
|vim.types| allows typing the empty table (it is unclear whether empty Lua
table represents empty list or empty array) and forcing integral numbers
to be |Float|. See |lua-special-tbl| for more details.
vim.val_idx *vim.val_idx*
Value index for tables representing |Float|s. A table representing
floating-point value 1.0 looks like this: >
{
[vim.type_idx] = vim.types.float,
[vim.val_idx] = 1.0,
}
< See also |vim.type_idx| and |lua-special-tbl|.
vim.types *vim.types*
Table with possible values for |vim.type_idx|. Contains two sets of
key-value pairs: first maps possible values for |vim.type_idx| to
human-readable strings, second maps human-readable type names to values
for |vim.type_idx|. Currently contains pairs for `float`, `array` and
`dictionary` types.
Note: One must expect that values corresponding to `vim.types.float`,
`vim.types.array` and `vim.types.dictionary` fall under only two following
assumptions:
1. Value may serve both as a key and as a value in a table. Given the
properties of Lua tables this basically means “value is not `nil`”.
2. For each value in `vim.types` table `vim.types[vim.types[value]]` is the
same as `value`.
No other restrictions are put on types, and it is not guaranteed that
values corresponding to `vim.types.float`, `vim.types.array` and
`vim.types.dictionary` will not change or that `vim.types` table will only
contain values for these three types.
*log_levels* *vim.log.levels*
Log levels are one of the values defined in `vim.log.levels`:
vim.log.levels.DEBUG
vim.log.levels.ERROR
vim.log.levels.INFO
vim.log.levels.TRACE
vim.log.levels.WARN
vim.log.levels.OFF
------------------------------------------------------------------------------
LUA-VIMSCRIPT BRIDGE *lua-vimscript*
Nvim Lua provides an interface to Vimscript variables and functions, and
editor commands and options.
See also https://github.com/nanotee/nvim-lua-guide.
vim.call({func}, {...}) *vim.call()*
Invokes |vim-function| or |user-function| {func} with arguments {...}.
See also |vim.fn|.
Equivalent to: >
vim.fn[func]({...})
vim.cmd({command})
See |vim.cmd()|.
vim.fn.{func}({...}) *vim.fn*
Invokes |vim-function| or |user-function| {func} with arguments {...}.
To call autoload functions, use the syntax: >
vim.fn['some#function']({...})
<
Unlike vim.api.|nvim_call_function()| this converts directly between Vim
objects and Lua objects. If the Vim function returns a float, it will be
represented directly as a Lua number. Empty lists and dictionaries both
are represented by an empty table.
Note: |v:null| values as part of the return value is represented as
|vim.NIL| special value
Note: vim.fn keys are generated lazily, thus `pairs(vim.fn)` only
enumerates functions that were called at least once.
Note: The majority of functions cannot run in |api-fast| callbacks with some
undocumented exceptions which are allowed.
*lua-vim-variables*
The Vim editor global dictionaries |g:| |w:| |b:| |t:| |v:| can be accessed
from Lua conveniently and idiomatically by referencing the `vim.*` Lua tables
described below. In this way you can easily read and modify global Vimscript
variables from Lua.
Example: >
vim.g.foo = 5 -- Set the g:foo Vimscript variable.
print(vim.g.foo) -- Get and print the g:foo Vimscript variable.
vim.g.foo = nil -- Delete (:unlet) the Vimscript variable.
vim.b[2].foo = 6 -- Set b:foo for buffer 2
<
vim.g *vim.g*
Global (|g:|) editor variables.
Key with no value returns `nil`.
vim.b *vim.b*
Buffer-scoped (|b:|) variables for the current buffer.
Invalid or unset key returns `nil`. Can be indexed with
an integer to access variables for a specific buffer.
vim.w *vim.w*
Window-scoped (|w:|) variables for the current window.
Invalid or unset key returns `nil`. Can be indexed with
an integer to access variables for a specific window.
vim.t *vim.t*
Tabpage-scoped (|t:|) variables for the current tabpage.
Invalid or unset key returns `nil`. Can be indexed with
an integer to access variables for a specific tabpage.
vim.v *vim.v*
|v:| variables.
Invalid or unset key returns `nil`.
vim.env *vim.env*
Environment variables defined in the editor session.
See |expand-env| and |:let-environment| for the Vimscript behavior.
Invalid or unset key returns `nil`.
Example: >
vim.env.FOO = 'bar'
print(vim.env.TERM)
<
*lua-options*
*lua-vim-options*
*lua-vim-set*
*lua-vim-setlocal*
Vim options can be accessed through |vim.o|, which behaves like Vimscript
|:set|.
Examples: ~
To set a boolean toggle:
In Vimscript:
`set number`
In Lua:
`vim.o.number = true`
To set a string value:
In Vimscript:
`set wildignore=*.o,*.a,__pycache__`
In Lua:
`vim.o.wildignore = '*.o,*.a,__pycache__'`
Similarly, there exist |vim.bo| and |vim.wo| for setting buffer-local and
window-local options, respectively, similarly to |:setlocal|. There is also
|vim.go| that only sets the global value of a |global-local| option, see
|:setglobal|. The following table summarizes this relation.
lua command global_value local_value ~
vim.o :set set set
vim.bo/vim.wo :setlocal - set
vim.go :setglobal set -
vim.o *vim.o*
Get or set editor options, like |:set|. Invalid key is an error.
Example: >
vim.o.cmdheight = 4
print(vim.o.columns)
print(vim.o.foo) -- error: invalid key
<
vim.go *vim.go*
Get or set an |option|. Invalid key is an error.
This is a wrapper around |nvim_set_option_value()| and
|nvim_get_option_value()|.
NOTE: This is different from |vim.o| because this ONLY sets the global
option, which generally produces confusing behavior for options with
|global-local| values.
Example: >
vim.go.cmdheight = 4
print(vim.go.columns)
print(vim.go.bar) -- error: invalid key
<
vim.bo[{bufnr}] *vim.bo*
Get or set buffer-scoped |local-options| for the buffer with number {bufnr}.
If [{bufnr}] is omitted, use the current buffer. Invalid {bufnr} or key is
an error.
This is a wrapper around |nvim_set_option_value()| and
|nvim_get_option_value()| with `opts = {scope = local, buf = bufnr}` .
Example: >
local bufnr = vim.api.nvim_get_current_buf()
vim.bo[bufnr].buflisted = true -- same as vim.bo.buflisted = true
print(vim.bo.comments)
print(vim.bo.baz) -- error: invalid key
<
vim.wo[{winid}] *vim.wo*
Get or set window-scoped |local-options| for the window with handle {winid}.
If [{winid}] is omitted, use the current window. Invalid {winid} or key
is an error.
This is a wrapper around |nvim_set_option_value()| and
|nvim_get_option_value()| with `opts = {scope = local, win = winid}` .
Example: >
local winid = vim.api.nvim_get_current_win()
vim.wo[winid].number = true -- same as vim.wo.number = true
print(vim.wo.foldmarker)
print(vim.wo.quux) -- error: invalid key
<
*lua-vim-opt*
*lua-vim-optlocal*
*lua-vim-optglobal*
*vim.opt*
A special interface |vim.opt| exists for conveniently interacting with list-
and map-style option from Lua: It allows accessing them as Lua tables and
offers object-oriented method for adding and removing entries.
Examples: ~
The following methods of setting a list-style option are equivalent:
In Vimscript:
`set wildignore=*.o,*.a,__pycache__`
In Lua using `vim.o`:
`vim.o.wildignore = '*.o,*.a,__pycache__'`
In Lua using `vim.opt`:
`vim.opt.wildignore = { '*.o', '*.a', '__pycache__' }`
To replicate the behavior of |:set+=|, use: >
vim.opt.wildignore:append { "*.pyc", "node_modules" }
<
To replicate the behavior of |:set^=|, use: >
vim.opt.wildignore:prepend { "new_first_value" }
<
To replicate the behavior of |:set-=|, use: >
vim.opt.wildignore:remove { "node_modules" }
<
The following methods of setting a map-style option are equivalent:
In Vimscript:
`set listchars=space:_,tab:>~`
In Lua using `vim.o`:
`vim.o.listchars = 'space:_,tab:>~'`
In Lua using `vim.opt`:
`vim.opt.listchars = { space = '_', tab = '>~' }`
Note that |vim.opt| returns an `Option` object, not the value of the option,
which is accessed through |Option:get()|:
Examples: ~
The following methods of getting a list-style option are equivalent:
In Vimscript:
`echo wildignore`
In Lua using `vim.o`:
`print(vim.o.wildignore)`
In Lua using `vim.opt`:
`vim.pretty_print(vim.opt.wildignore:get())`
In any of the above examples, to replicate the behavior |setlocal|, use
`vim.opt_local`. Additionally, to replicate the behavior of |setglobal|, use
`vim.opt_global`.
*vim.opt:get()*
Option:get()
Returns a lua-representation of the option. Boolean, number and string
values will be returned in exactly the same fashion.
For values that are comma-separated lists, an array will be returned with
the values as entries in the array: >
vim.cmd [[set wildignore=*.pyc,*.o]]
vim.pretty_print(vim.opt.wildignore:get())
-- { "*.pyc", "*.o", }
for _, ignore_pattern in ipairs(vim.opt.wildignore:get()) do
print("Will ignore:", ignore_pattern)
end
-- Will ignore: *.pyc
-- Will ignore: *.o
<
For values that are comma-separated maps, a table will be returned with
the names as keys and the values as entries: >
vim.cmd [[set listchars=space:_,tab:>~]]
vim.pretty_print(vim.opt.listchars:get())
-- { space = "_", tab = ">~", }
for char, representation in pairs(vim.opt.listchars:get()) do
print(char, "->", representation)
end
<
For values that are lists of flags, a set will be returned with the flags
as keys and `true` as entries. >
vim.cmd [[set formatoptions=njtcroql]]
vim.pretty_print(vim.opt.formatoptions:get())
-- { n = true, j = true, c = true, ... }
local format_opts = vim.opt.formatoptions:get()
if format_opts.j then
print("J is enabled!")
end
<
*vim.opt:append()*
Option:append(value)
Append a value to string-style options. See |:set+=|
These are equivalent:
`vim.opt.formatoptions:append('j')`
`vim.opt.formatoptions = vim.opt.formatoptions + 'j'`
*vim.opt:prepend()*
Option:prepend(value)
Prepend a value to string-style options. See |:set^=|
These are equivalent:
`vim.opt.wildignore:prepend('*.o')`
`vim.opt.wildignore = vim.opt.wildignore ^ '*.o'`
*vim.opt:remove()*
Option:remove(value)
Remove a value from string-style options. See |:set-=|
These are equivalent:
`vim.opt.wildignore:remove('*.pyc')`
`vim.opt.wildignore = vim.opt.wildignore - '*.pyc'`
==============================================================================
Lua module: vim *lua-vim*
cmd({command}) *vim.cmd()*
Execute Vim script commands.
Note that `vim.cmd` can be indexed with a command name to return a
callable function to the command.
Example: >
vim.cmd('echo 42')
vim.cmd([[
augroup My_group
autocmd!
autocmd FileType c setlocal cindent
augroup END
]])
-- Ex command :echo "foo"
-- Note string literals need to be double quoted.
vim.cmd('echo "foo"')
vim.cmd { cmd = 'echo', args = { '"foo"' } }
vim.cmd.echo({ args = { '"foo"' } })
vim.cmd.echo('"foo"')
-- Ex command :write! myfile.txt
vim.cmd('write! myfile.txt')
vim.cmd { cmd = 'write', args = { "myfile.txt" }, bang = true }
vim.cmd.write { args = { "myfile.txt" }, bang = true }
vim.cmd.write { "myfile.txt", bang = true }
-- Ex command :colorscheme blue
vim.cmd('colorscheme blue')
vim.cmd.colorscheme('blue')
<
Parameters: ~
{command} string|table Command(s) to execute. If a string, executes
multiple lines of Vim script at once. In this case, it is
an alias to |nvim_exec()|, where `output` is set to false.
Thus it works identical to |:source|. If a table, executes
a single command. In this case, it is an alias to
|nvim_cmd()| where `opts` is empty.
See also: ~
|ex-cmd-index|
*vim.connection_failure_errmsg()*
connection_failure_errmsg({consequence})
TODO: Documentation
defer_fn({fn}, {timeout}) *vim.defer_fn()*
Defers calling `fn` until `timeout` ms passes.
Use to do a one-shot timer that calls `fn` Note: The {fn} is |schedule_wrap|ped automatically, so API functions are
safe to call.
Parameters: ~
{fn} Callback to call once `timeout` expires
{timeout} Number of milliseconds to wait before calling `fn`
Return: ~
timer luv timer object
*vim.deprecate()*
deprecate({name}, {alternative}, {version}, {plugin}, {backtrace})
Display a deprecation notification to the user.
Parameters: ~
{name} string Deprecated function.
{alternative} (string|nil) Preferred alternative function.
{version} string Version in which the deprecated function will be
removed.
{plugin} string|nil Plugin name that the function will be
removed from. Defaults to "Nvim".
{backtrace} boolean|nil Prints backtrace. Defaults to true.
inspect({object}, {options}) *vim.inspect()*
Return a human-readable representation of the given object.
See also: ~
https://github.com/kikito/inspect.lua
https://github.com/mpeterv/vinspect
notify({msg}, {level}, {opts}) *vim.notify()*
Display a notification to the user.
This function can be overridden by plugins to display notifications using
a custom provider (such as the system notification provider). By default,
writes to |:messages|.
Parameters: ~
{msg} (string) Content of the notification to show to the user.
{level} (number|nil) One of the values from |vim.log.levels|.
{opts} (table|nil) Optional parameters. Unused by default.
notify_once({msg}, {level}, {opts}) *vim.notify_once()*
Display a notification only one time.
Like |vim.notify()|, but subsequent calls with the same message will not
display a notification.
Parameters: ~
{msg} (string) Content of the notification to show to the user.
{level} (number|nil) One of the values from |vim.log.levels|.
{opts} (table|nil) Optional parameters. Unused by default.
Return: ~
(boolean) true if message was displayed, else false
on_key({fn}, {ns_id}) *vim.on_key()*
Adds Lua function {fn} with namespace id {ns_id} as a listener to every,
yes every, input key.
The Nvim command-line option |-w| is related but does not support
callbacks and cannot be toggled dynamically.
Note:
{fn} will not be cleared by |nvim_buf_clear_namespace()|
Note:
{fn} will receive the keys after mappings have been evaluated
Parameters: ~
{fn} function: Callback function. It should take one string
argument. On each key press, Nvim passes the key char to
fn(). |i_CTRL-V| If {fn} is nil, it removes the callback for
the associated {ns_id}
{ns_id} number? Namespace ID. If nil or 0, generates and returns a
new |nvim_create_namespace()| id.
Return: ~
(number) Namespace id associated with {fn}. Or count of all callbacks
if on_key() is called without arguments.
Note:
{fn} will be removed if an error occurs while calling.
paste({lines}, {phase}) *vim.paste()*
Paste handler, invoked by |nvim_paste()| when a conforming UI (such as the
|TUI|) pastes text into the editor.
Example: To remove ANSI color codes when pasting: >
vim.paste = (function(overridden)
return function(lines, phase)
for i,line in ipairs(lines) do
-- Scrub ANSI color codes from paste input.
lines[i] = line:gsub('\27%[[0-9;mK]+', '')
end
overridden(lines, phase)
end
end)(vim.paste)
<
Parameters: ~
{lines} |readfile()|-style list of lines to paste. |channel-lines|
{phase} -1: "non-streaming" paste: the call contains all lines. If
paste is "streamed", `phase` indicates the stream state:
• 1: starts the paste (exactly once)
• 2: continues the paste (zero or more times)
• 3: ends the paste (exactly once)
Return: ~
false if client should cancel the paste.
See also: ~
|paste|
pretty_print({...}) *vim.pretty_print()*
Prints given arguments in human-readable format. Example: >
-- Print highlight group Normal and store it's contents in a variable.
local hl_normal = vim.pretty_print(vim.api.nvim_get_hl_by_name("Normal", true))
<
Return: ~
given arguments.
See also: ~
|vim.inspect()|
region({bufnr}, {pos1}, {pos2}, {regtype}, {inclusive}) *vim.region()*
Get a table of lines with start, end columns for a region marked by two
points
Parameters: ~
{bufnr} (number) of buffer
{pos1} (line, column) tuple marking beginning of region
{pos2} (line, column) tuple marking end of region
{regtype} type of selection (:help setreg)
{inclusive} (boolean) indicating whether the selection is
end-inclusive
Return: ~
region lua table of the form {linenr = {startcol,endcol}}
schedule_wrap({cb}) *vim.schedule_wrap()*
Defers callback `cb` until the Nvim API is safe to call.
See also: ~
|lua-loop-callbacks|
|vim.schedule()|
|vim.in_fast_event()|
deep_equal({a}, {b}) *vim.deep_equal()*
Deep compare values for equality
Tables are compared recursively unless they both provide the `eq` metamethod. All other types are compared using the equality `==` operator.
Parameters: ~
{a} any First value
{b} any Second value
Return: ~
(boolean) `true` if values are equals, else `false`
deepcopy({orig}) *vim.deepcopy()*
Returns a deep copy of the given object. Non-table objects are copied as
in a typical Lua assignment, whereas table objects are copied recursively.
Functions are naively copied, so functions in the copied table point to
the same functions as those in the input table. Userdata and threads are
not copied and will throw an error.
Parameters: ~
{orig} (table) Table to copy
Return: ~
(table) Table of copied keys and (nested) values.
endswith({s}, {suffix}) *vim.endswith()*
Tests if `s` ends with `suffix`.
Parameters: ~
{s} (string) String
{suffix} (string) Suffix to match
Return: ~
(boolean) `true` if `suffix` is a suffix of `s`
gsplit({s}, {sep}, {plain}) *vim.gsplit()*
Splits a string at each instance of a separator.
Parameters: ~
{s} (string) String to split
{sep} (string) Separator or pattern
{plain} (boolean) If `true` use `sep` literally (passed to
string.find)
Return: ~
(function) Iterator over the split components
See also: ~
|vim.split()|
https://www.lua.org/pil/20.2.html
http://lua-users.org/wiki/StringLibraryTutorial
is_callable({f}) *vim.is_callable()*
Returns true if object `f` can be called as a function.
Parameters: ~
{f} any Any object
Return: ~
(boolean) `true` if `f` is callable, else `false`
list_extend({dst}, {src}, {start}, {finish}) *vim.list_extend()*
Extends a list-like table with the values of another list-like table.
NOTE: This mutates dst!
Parameters: ~
{dst} (table) List which will be modified and appended to
{src} (table) List from which values will be inserted
{start} (number) Start index on src. Defaults to 1
{finish} (number) Final index on src. Defaults to `#src`
Return: ~
(table) dst
See also: ~
|vim.tbl_extend()|
list_slice({list}, {start}, {finish}) *vim.list_slice()*
Creates a copy of a table containing only elements from start to end
(inclusive)
Parameters: ~
{list} (table) Table
{start} (number) Start range of slice
{finish} (number) End range of slice
Return: ~
(table) Copy of table sliced from start to finish (inclusive)
pesc({s}) *vim.pesc()*
Escapes magic chars in |lua-patterns|.
Parameters: ~
{s} (string) String to escape
Return: ~
(string) %-escaped pattern string
See also: ~
https://github.com/rxi/lume
split({s}, {sep}, {kwargs}) *vim.split()*
Splits a string at each instance of a separator.
Examples: >
split(":aa::b:", ":") --> {'','aa','','b',''}
split("axaby", "ab?") --> {'','x','y'}
split("x*yz*o", "*", {plain=true}) --> {'x','yz','o'}
split("|x|y|z|", "|", {trimempty=true}) --> {'x', 'y', 'z'}
<
Parameters: ~
{s} (string) String to split
{sep} (string) Separator or pattern
{kwargs} (table) Keyword arguments:
• plain: (boolean) If `true` use `sep` literally (passed to
string.find)
• trimempty: (boolean) If `true` remove empty items from the
front and back of the list
Return: ~
(table) List of split components
See also: ~
|vim.gsplit()|
startswith({s}, {prefix}) *vim.startswith()*
Tests if `s` starts with `prefix`.
Parameters: ~
{s} (string) String
{prefix} (string) Prefix to match
Return: ~
(boolean) `true` if `prefix` is a prefix of `s`
tbl_add_reverse_lookup({o}) *vim.tbl_add_reverse_lookup()*
Add the reverse lookup values to an existing table. For example:
`tbl_add_reverse_lookup { A = 1 } == { [1] = 'A', A = 1 }`
Note that this modifies the input.
Parameters: ~
{o} (table) Table to add the reverse to
Return: ~
(table) o
tbl_contains({t}, {value}) *vim.tbl_contains()*
Checks if a list-like (vector) table contains `value`.
Parameters: ~
{t} (table) Table to check
{value} any Value to compare
Return: ~
(boolean) `true` if `t` contains `value`
tbl_count({t}) *vim.tbl_count()*
Counts the number of non-nil values in table `t`.
>
vim.tbl_count({ a=1, b=2 }) => 2
vim.tbl_count({ 1, 2 }) => 2
<
Parameters: ~
{t} (table) Table
Return: ~
(number) Number of non-nil values in table
See also: ~
https://github.com/Tieske/Penlight/blob/master/lua/pl/tablex.lua
tbl_deep_extend({behavior}, {...}) *vim.tbl_deep_extend()*
Merges recursively two or more map-like tables.
Parameters: ~
{behavior} (string) Decides what to do if a key is found in more than
one map:
• "error": raise an error
• "keep": use value from the leftmost map
• "force": use value from the rightmost map
{...} (table) Two or more map-like tables
Return: ~
(table) Merged table
See also: ~
|tbl_extend()|
tbl_extend({behavior}, {...}) *vim.tbl_extend()*
Merges two or more map-like tables.
Parameters: ~
{behavior} (string) Decides what to do if a key is found in more than
one map:
• "error": raise an error
• "keep": use value from the leftmost map
• "force": use value from the rightmost map
{...} (table) Two or more map-like tables
Return: ~
(table) Merged table
See also: ~
|extend()|
tbl_filter({func}, {t}) *vim.tbl_filter()*
Filter a table using a predicate function
Parameters: ~
{func} function|table Function or callable table
{t} (table) Table
Return: ~
(table) Table of filtered values
tbl_flatten({t}) *vim.tbl_flatten()*
Creates a copy of a list-like table such that any nested tables are
"unrolled" and appended to the result.
Parameters: ~
{t} (table) List-like table
Return: ~
(table) Flattened copy of the given list-like table
See also: ~
From https://github.com/premake/premake-core/blob/master/src/base/table.lua
tbl_get({o}, {...}) *vim.tbl_get()*
Index into a table (first argument) via string keys passed as subsequent
arguments. Return `nil` if the key does not exist.
Examples: >
vim.tbl_get({ key = { nested_key = true }}, 'key', 'nested_key') == true
vim.tbl_get({ key = {}}, 'key', 'nested_key') == nil
<
Parameters: ~
{o} (table) Table to index
{...} (string) Optional strings (0 or more, variadic) via which to
index the table
Return: ~
any Nested value indexed by key (if it exists), else nil
tbl_isempty({t}) *vim.tbl_isempty()*
Checks if a table is empty.
Parameters: ~
{t} (table) Table to check
Return: ~
(boolean) `true` if `t` is empty
See also: ~
https://github.com/premake/premake-core/blob/master/src/base/table.lua
tbl_islist({t}) *vim.tbl_islist()*
Tests if a Lua table can be treated as an array.
Empty table `{}` is assumed to be an array, unless it was created by
|vim.empty_dict()| or returned as a dict-like |API| or Vimscript result,
for example from |rpcrequest()| or |vim.fn|.
Parameters: ~
{t} (table) Table
Return: ~
(boolean) `true` if array-like table, else `false`
tbl_keys({t}) *vim.tbl_keys()*
Return a list of all keys used in a table. However, the order of the
return table of keys is not guaranteed.
Parameters: ~
{t} (table) Table
Return: ~
(table) List of keys
See also: ~
From https://github.com/premake/premake-core/blob/master/src/base/table.lua
tbl_map({func}, {t}) *vim.tbl_map()*
Apply a function to all values of a table.
Parameters: ~
{func} function|table Function or callable table
{t} (table) Table
Return: ~
(table) Table of transformed values
tbl_values({t}) *vim.tbl_values()*
Return a list of all values used in a table. However, the order of the
return table of values is not guaranteed.
Parameters: ~
{t} (table) Table
Return: ~
(table) List of values
trim({s}) *vim.trim()*
Trim whitespace (Lua pattern "%s") from both sides of a string.
Parameters: ~
{s} (string) String to trim
Return: ~
(string) String with whitespace removed from its beginning and end
See also: ~
https://www.lua.org/pil/20.2.html
validate({opt}) *vim.validate()*
Validates a parameter specification (types and values).
Usage example: >
function user.new(name, age, hobbies)
vim.validate{
name={name, 'string'},
age={age, 'number'},
hobbies={hobbies, 'table'},
}
...
end
<
Examples with explicit argument values (can be run directly): >
vim.validate{arg1={{'foo'}, 'table'}, arg2={'foo', 'string'}}
=> NOP (success)
vim.validate{arg1={1, 'table'}}
=> error('arg1: expected table, got number')
vim.validate{arg1={3, function(a) return (a % 2) == 0 end, 'even number'}}
=> error('arg1: expected even number, got 3')
<
If multiple types are valid they can be given as a list. >
vim.validate{arg1={{'foo'}, {'table', 'string'}}, arg2={'foo', {'table', 'string'}}}
=> NOP (success)
vim.validate{arg1={1, {'string', table'}}}
=> error('arg1: expected string|table, got number')
<
Parameters: ~
{opt} (table) Names of parameters to validate. Each key is a
parameter name; each value is a tuple in one of these forms:
1. (arg_value, type_name, optional)
• arg_value: argument value
• type_name: string|table type name, one of: ("table", "t",
"string", "s", "number", "n", "boolean", "b", "function",
"f", "nil", "thread", "userdata") or list of them.
• optional: (optional) boolean, if true, `nil` is valid
2. (arg_value, fn, msg)
• arg_value: argument value
• fn: any function accepting one argument, returns true if
and only if the argument is valid. Can optionally return
an additional informative error message as the second
returned value.
• msg: (optional) error string if validation fails
==============================================================================
Lua module: uri *lua-uri*
uri_from_bufnr({bufnr}) *vim.uri_from_bufnr()*
Get a URI from a bufnr
Parameters: ~
{bufnr} (number)
Return: ~
(string) URI
uri_from_fname({path}) *vim.uri_from_fname()*
Get a URI from a file path.
Parameters: ~
{path} (string) Path to file
Return: ~
(string) URI
uri_to_bufnr({uri}) *vim.uri_to_bufnr()*
Get the buffer for a uri. Creates a new unloaded buffer if no buffer for
the uri already exists.
Parameters: ~
{uri} (string)
Return: ~
(number) bufnr
uri_to_fname({uri}) *vim.uri_to_fname()*
Get a filename from a URI
Parameters: ~
{uri} (string)
Return: ~
(string) filename or unchanged URI for non-file URIs
==============================================================================
Lua module: ui *lua-ui*
input({opts}, {on_confirm}) *vim.ui.input()*
Prompts the user for input
Example: >
vim.ui.input({ prompt = 'Enter value for shiftwidth: ' }, function(input)
vim.o.shiftwidth = tonumber(input)
end)
<
Parameters: ~
{opts} (table) Additional options. See |input()|
• prompt (string|nil) Text of the prompt
• default (string|nil) Default reply to the input
• completion (string|nil) Specifies type of completion
supported for input. Supported types are the same that
can be supplied to a user-defined command using the
"-complete=" argument. See |:command-completion|
• highlight (function) Function that will be used for
highlighting user inputs.
{on_confirm} (function) ((input|nil) -> ()) Called once the user
confirms or abort the input. `input` is what the user
typed. `nil` if the user aborted the dialog.
select({items}, {opts}, {on_choice}) *vim.ui.select()*
Prompts the user to pick a single item from a collection of entries
Example: >
vim.ui.select({ 'tabs', 'spaces' }, {
prompt = 'Select tabs or spaces:',
format_item = function(item)
return "I'd like to choose " .. item
end,
}, function(choice)
if choice == 'spaces' then
vim.o.expandtab = true
else
vim.o.expandtab = false
end
end)
<
Parameters: ~
{items} (table) Arbitrary items
{opts} (table) Additional options
• prompt (string|nil) Text of the prompt. Defaults to
`Select one of:`
• format_item (function item -> text) Function to format
an individual item from `items`. Defaults to
`tostring`.
• kind (string|nil) Arbitrary hint string indicating the
item shape. Plugins reimplementing `vim.ui.select` may
wish to use this to infer the structure or semantics of
`items`, or the context in which select() was called.
{on_choice} (function) ((item|nil, idx|nil) -> ()) Called once the
user made a choice. `idx` is the 1-based index of `item`
within `items`. `nil` if the user aborted the dialog.
==============================================================================
Lua module: filetype *lua-filetype*
add({filetypes}) *vim.filetype.add()*
Add new filetype mappings.
Filetype mappings can be added either by extension or by filename (either
the "tail" or the full file path). The full file path is checked first,
followed by the file name. If a match is not found using the filename,
then the filename is matched against the list of |lua-patterns| (sorted by
priority) until a match is found. Lastly, if pattern matching does not
find a filetype, then the file extension is used.
The filetype can be either a string (in which case it is used as the
filetype directly) or a function. If a function, it takes the full path
and buffer number of the file as arguments (along with captures from the
matched pattern, if any) and should return a string that will be used as
the buffer's filetype. Optionally, the function can return a second
function value which, when called, modifies the state of the buffer. This
can be used to, for example, set filetype-specific buffer variables.
Filename patterns can specify an optional priority to resolve cases when a
file path matches multiple patterns. Higher priorities are matched first.
When omitted, the priority defaults to 0.
See $VIMRUNTIME/lua/vim/filetype.lua for more examples.
Note that Lua filetype detection is disabled when |g:do_legacy_filetype|
is set.
Example: >
vim.filetype.add({
extension = {
foo = 'fooscript',
bar = function(path, bufnr)
if some_condition() then
return 'barscript', function(bufnr)
-- Set a buffer variable
vim.b[bufnr].barscript_version = 2
end
end
return 'bar'
end,
},
filename = {
['.foorc'] = 'toml',
['/etc/foo/config'] = 'toml',
},
pattern = {
['.*/etc/foo/.*'] = 'fooscript',
-- Using an optional priority
['.*/etc/foo/.*%.conf'] = { 'dosini', { priority = 10 } },
['README.(a+)$'] = function(path, bufnr, ext)
if ext == 'md' then
return 'markdown'
elseif ext == 'rst' then
return 'rst'
end
end,
},
})
<
To add a fallback match on contents (see |new-filetype-scripts|), use >
vim.filetype.add {
pattern = {
['.*'] = {
priority = -math.huge,
function(path, bufnr)
local content = vim.filetype.getlines(bufnr, 1)
if vim.filetype.matchregex(content, [[^#!.*\<mine\>]]) then
return 'mine'
elseif vim.filetype.matchregex(content, [[\<drawing\>]]) then
return 'drawing'
end
end,
},
},
}
<
Parameters: ~
{filetypes} (table) A table containing new filetype maps (see
example).
match({args}) *vim.filetype.match()*
Perform filetype detection.
The filetype can be detected using one of three methods:
1. Using an existing buffer
2. Using only a file name
3. Using only file contents
Of these, option 1 provides the most accurate result as it uses both the
buffer's filename and (optionally) the buffer contents. Options 2 and 3
can be used without an existing buffer, but may not always provide a match
in cases where the filename (or contents) cannot unambiguously determine
the filetype.
Each of the three options is specified using a key to the single argument
of this function. Example:
>
-- Using a buffer number
vim.filetype.match({ buf = 42 })
-- Override the filename of the given buffer
vim.filetype.match({ buf = 42, filename = 'foo.c' })
-- Using a filename without a buffer
vim.filetype.match({ filename = 'main.lua' })
-- Using file contents
vim.filetype.match({ contents = {'#!/usr/bin/env bash'} })
<
Parameters: ~
{args} (table) Table specifying which matching strategy to use.
Accepted keys are:
• buf (number): Buffer number to use for matching. Mutually
exclusive with {contents}
• filename (string): Filename to use for matching. When {buf}
is given, defaults to the filename of the given buffer
number. The file need not actually exist in the filesystem.
When used without {buf} only the name of the file is used
for filetype matching. This may result in failure to detect
the filetype in cases where the filename alone is not enough
to disambiguate the filetype.
• contents (table): An array of lines representing file
contents to use for matching. Can be used with {filename}.
Mutually exclusive with {buf}.
Return: ~
(string|nil) If a match was found, the matched filetype.
(function|nil) A function that modifies buffer state when called (for
example, to set some filetype specific buffer variables). The function
accepts a buffer number as its only argument.
==============================================================================
Lua module: keymap *lua-keymap*
del({modes}, {lhs}, {opts}) *vim.keymap.del()*
Remove an existing mapping. Examples: >
vim.keymap.del('n', 'lhs')
vim.keymap.del({'n', 'i', 'v'}, '<leader>w', { buffer = 5 })
<
Parameters: ~
{opts} (table) A table of optional arguments:
• buffer: (number or boolean) Remove a mapping from the given
buffer. When "true" or 0, use the current buffer.
See also: ~
|vim.keymap.set()|
set({mode}, {lhs}, {rhs}, {opts}) *vim.keymap.set()*
Add a new |mapping|. Examples: >
-- Can add mapping to Lua functions
vim.keymap.set('n', 'lhs', function() print("real lua function") end)
-- Can use it to map multiple modes
vim.keymap.set({'n', 'v'}, '<leader>lr', vim.lsp.buf.references, { buffer=true })
-- Can add mapping for specific buffer
vim.keymap.set('n', '<leader>w', "<cmd>w<cr>", { silent = true, buffer = 5 })
-- Expr mappings
vim.keymap.set('i', '<Tab>', function()
return vim.fn.pumvisible() == 1 and "<C-n>" or "<Tab>"
end, { expr = true })
-- <Plug> mappings
vim.keymap.set('n', '[%', '<Plug>(MatchitNormalMultiBackward)')
<
Note that in a mapping like: >
vim.keymap.set('n', 'asdf', require('jkl').my_fun)
<
the `require('jkl')` gets evaluated during this call in order to access the function. If you
want to avoid this cost at startup you can wrap it in a function, for
example: >
vim.keymap.set('n', 'asdf', function() return require('jkl').my_fun() end)
<
Parameters: ~
{mode} string|table Same mode short names as |nvim_set_keymap()|. Can
also be list of modes to create mapping on multiple modes.
{lhs} (string) Left-hand side |{lhs}| of the mapping.
{rhs} string|function Right-hand side |{rhs}| of the mapping. Can
also be a Lua function.
{opts} (table) A table of |:map-arguments|.
• Accepts options accepted by the {opts} parameter in
|nvim_set_keymap()|, with the following notable differences:
• replace_keycodes: Defaults to `true` if "expr" is `true`.
• noremap: Always overridden with the inverse of "remap"
(see below).
• In addition to those options, the table accepts the
following keys:
• buffer: (number or boolean) Add a mapping to the given
buffer. When `0` or `true`, use the current buffer.
• remap: (boolean) Make the mapping recursive. This is the
inverse of the "noremap" option from |nvim_set_keymap()|.
Defaults to `false`.
See also: ~
|nvim_set_keymap()|
==============================================================================
Lua module: fs *lua-fs*
basename({file}) *vim.fs.basename()*
Return the basename of the given file or directory
Parameters: ~
{file} (string) File or directory
Return: ~
(string) Basename of {file}
dir({path}) *vim.fs.dir()*
Return an iterator over the files and directories located in {path}
Parameters: ~
{path} (string) An absolute or relative path to the directory to
iterate over. The path is first normalized
|vim.fs.normalize()|.
Return: ~
Iterator over files and directories in {path}. Each iteration yields
two values: name and type. Each "name" is the basename of the file or
directory relative to {path}. Type is one of "file" or "directory".
dirname({file}) *vim.fs.dirname()*
Return the parent directory of the given file or directory
Parameters: ~
{file} (string) File or directory
Return: ~
(string) Parent directory of {file}
find({names}, {opts}) *vim.fs.find()*
Find files or directories in the given path.
Finds any files or directories given in {names} starting from {path}. If
{upward} is "true" then the search traverses upward through parent
directories; otherwise, the search traverses downward. Note that downward
searches are recursive and may search through many directories! If {stop}
is non-nil, then the search stops when the directory given in {stop} is
reached. The search terminates when {limit} (default 1) matches are found.
The search can be narrowed to find only files or or only directories by
specifying {type} to be "file" or "directory", respectively.
Parameters: ~
{names} (string|table) Names of the files and directories to find.
Must be base names, paths and globs are not supported.
{opts} (table) Optional keyword arguments:
• path (string): Path to begin searching from. If omitted,
the current working directory is used.
• upward (boolean, default false): If true, search upward
through parent directories. Otherwise, search through child
directories (recursively).
• stop (string): Stop searching when this directory is
reached. The directory itself is not searched.
• type (string): Find only files ("file") or directories
("directory"). If omitted, both files and directories that
match {name} are included.
• limit (number, default 1): Stop the search after finding
this many matches. Use `math.huge` to place no limit on the
number of matches.
Return: ~
(table) The paths of all matching files or directories
normalize({path}) *vim.fs.normalize()*
Normalize a path to a standard format. A tilde (~) character at the
beginning of the path is expanded to the user's home directory and any
backslash (\) characters are converted to forward slashes (/). Environment
variables are also expanded.
Example: >
vim.fs.normalize('C:\Users\jdoe')
=> 'C:/Users/jdoe'
vim.fs.normalize('~/src/neovim')
=> '/home/jdoe/src/neovim'
vim.fs.normalize('$XDG_CONFIG_HOME/nvim/init.vim')
=> '/Users/jdoe/.config/nvim/init.vim'
<
Parameters: ~
{path} (string) Path to normalize
Return: ~
(string) Normalized path
parents({start}) *vim.fs.parents()*
Iterate over all the parents of the given file or directory.
Example: >
local root_dir
for dir in vim.fs.parents(vim.api.nvim_buf_get_name(0)) do
if vim.fn.isdirectory(dir .. "/.git") == 1 then
root_dir = dir
break
end
end
if root_dir then
print("Found git repository at", root_dir)
end
<
Parameters: ~
{start} (string) Initial file or directory.
Return: ~
(function) Iterator
vim:tw=78:ts=8:sw=4:sts=4:et:ft=help:norl:
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