603 lines
22 KiB
Plaintext
603 lines
22 KiB
Plaintext
*if_lua.txt* Nvim
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NVIM REFERENCE MANUAL
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Lua engine *lua* *Lua*
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Type |gO| to see the table of contents.
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==============================================================================
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Introduction *lua-intro*
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The Lua 5.1 language is builtin and always available. Try this command to get
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an idea of what lurks beneath: >
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:lua print(vim.inspect(package.loaded))
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Nvim includes a "standard library" |lua-stdlib| for Lua. It complements the
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"editor stdlib" (|functions| and Ex commands) and the |API|, all of which can
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be used from Lua code.
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Module conflicts are resolved by "last wins". For example if both of these
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are on 'runtimepath':
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runtime/lua/foo.lua
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~/.config/nvim/lua/foo.lua
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then `require('foo')` loads "~/.config/nvim/lua/foo.lua", and
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"runtime/lua/foo.lua" is not used. See |lua-require| to understand how Nvim
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finds and loads Lua modules. The conventions are similar to VimL plugins,
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with some extra features. See |lua-require-example| for a walkthrough.
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==============================================================================
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Importing Lua modules *lua-require*
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Nvim automatically adjusts `package.path` and `package.cpath` according to
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effective 'runtimepath' value. Adjustment happens whenever 'runtimepath' is
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changed. `package.path` is adjusted by simply appending `/lua/?.lua` and
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`/lua/?/init.lua` to each directory from 'runtimepath' (`/` is actually the
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first character of `package.config`).
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Similarly to `package.path`, modified directories from 'runtimepath' are also
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added to `package.cpath`. In this case, instead of appending `/lua/?.lua` and
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`/lua/?/init.lua` to each runtimepath, all unique `?`-containing suffixes of
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the existing `package.cpath` are used. Example:
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1. Given that
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- 'runtimepath' contains `/foo/bar,/xxx;yyy/baz,/abc`;
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- initial (defined at compile-time or derived from
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`$LUA_CPATH`/`$LUA_INIT`) `package.cpath` contains
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`./?.so;/def/ghi/a?d/j/g.elf;/def/?.so`.
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2. It finds `?`-containing suffixes `/?.so`, `/a?d/j/g.elf` and `/?.so`, in
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order: parts of the path starting from the first path component containing
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question mark and preceding path separator.
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3. The suffix of `/def/?.so`, namely `/?.so` is not unique, as it’s the same
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as the suffix of the first path from `package.path` (i.e. `./?.so`). Which
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leaves `/?.so` and `/a?d/j/g.elf`, in this order.
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4. 'runtimepath' has three paths: `/foo/bar`, `/xxx;yyy/baz` and `/abc`. The
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second one contains semicolon which is a paths separator so it is out,
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leaving only `/foo/bar` and `/abc`, in order.
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5. The cartesian product of paths from 4. and suffixes from 3. is taken,
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giving four variants. In each variant `/lua` path segment is inserted
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between path and suffix, leaving
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- `/foo/bar/lua/?.so`
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- `/foo/bar/lua/a?d/j/g.elf`
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- `/abc/lua/?.so`
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- `/abc/lua/a?d/j/g.elf`
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6. New paths are prepended to the original `package.cpath`.
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The result will look like this:
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`/foo/bar,/xxx;yyy/baz,/abc` ('runtimepath')
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× `./?.so;/def/ghi/a?d/j/g.elf;/def/?.so` (`package.cpath`)
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= `/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`
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Note:
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- To track 'runtimepath' updates, paths added at previous update are
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remembered and removed at the next update, while all paths derived from the
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new 'runtimepath' are prepended as described above. This allows removing
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paths when path is removed from 'runtimepath', adding paths when they are
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added and reordering `package.path`/`package.cpath` content if 'runtimepath'
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was reordered.
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- Although adjustments happen automatically, Nvim does not track current
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values of `package.path` or `package.cpath`. If you happen to delete some
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paths from there you can set 'runtimepath' to trigger an update: >
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let &runtimepath = &runtimepath
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- Skipping paths from 'runtimepath' which contain semicolons applies both to
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`package.path` and `package.cpath`. Given that there are some badly written
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plugins using shell which will not work with paths containing semicolons it
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is better to not have them in 'runtimepath' at all.
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------------------------------------------------------------------------------
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LUA PLUGIN EXAMPLE *lua-require-example*
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The following example plugin adds a command `:MakeCharBlob` which transforms
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current buffer into a long `unsigned char` array. Lua contains transformation
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function in a module `lua/charblob.lua` which is imported in
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`autoload/charblob.vim` (`require("charblob")`). Example plugin is supposed
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to be put into any directory from 'runtimepath', e.g. `~/.config/nvim` (in
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this case `lua/charblob.lua` means `~/.config/nvim/lua/charblob.lua`).
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autoload/charblob.vim: >
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function charblob#encode_buffer()
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call setline(1, luaeval(
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\ 'require("charblob").encode(unpack(_A))',
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\ [getline(1, '$'), &textwidth, ' ']))
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endfunction
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plugin/charblob.vim: >
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if exists('g:charblob_loaded')
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finish
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endif
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let g:charblob_loaded = 1
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command MakeCharBlob :call charblob#encode_buffer()
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lua/charblob.lua: >
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local function charblob_bytes_iter(lines)
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local init_s = {
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next_line_idx = 1,
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next_byte_idx = 1,
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lines = lines,
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}
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local function next(s, _)
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if lines[s.next_line_idx] == nil then
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return nil
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end
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if s.next_byte_idx > #(lines[s.next_line_idx]) then
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s.next_line_idx = s.next_line_idx + 1
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s.next_byte_idx = 1
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return ('\n'):byte()
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end
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local ret = lines[s.next_line_idx]:byte(s.next_byte_idx)
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if ret == ('\n'):byte() then
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ret = 0 -- See :h NL-used-for-NUL.
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end
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s.next_byte_idx = s.next_byte_idx + 1
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return ret
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end
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return next, init_s, nil
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end
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local function charblob_encode(lines, textwidth, indent)
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local ret = {
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'const unsigned char blob[] = {',
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indent,
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}
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for byte in charblob_bytes_iter(lines) do
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-- .- space + number (width 3) + comma
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if #(ret[#ret]) + 5 > textwidth then
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ret[#ret + 1] = indent
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else
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ret[#ret] = ret[#ret] .. ' '
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end
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ret[#ret] = ret[#ret] .. (('%3u,'):format(byte))
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end
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ret[#ret + 1] = '};'
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return ret
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end
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return {
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bytes_iter = charblob_bytes_iter,
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encode = charblob_encode,
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}
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==============================================================================
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Commands *lua-commands*
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*:lua*
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:[range]lua {chunk}
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Execute Lua chunk {chunk}.
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Examples:
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>
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:lua vim.api.nvim_command('echo "Hello, Nvim!"')
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<
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To see the Lua version: >
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:lua print(_VERSION)
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To see the LuaJIT version: >
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:lua print(jit.version)
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<
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:[range]lua << {endmarker}
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{script}
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{endmarker}
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Execute Lua script {script}.
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{endmarker} must NOT be preceded by any white space. If {endmarker} is
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omitted from after the "<<", a dot '.' must be used after {script}, like
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for the |:append| and |:insert| commands.
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This form of the |:lua| command is mainly useful for including Lua code
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in Vim scripts.
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Example:
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>
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function! CurrentLineInfo()
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lua << EOF
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local linenr = vim.api.nvim_win_get_cursor(0)[1]
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local curline = vim.api.nvim_buf_get_lines(
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0, linenr, linenr + 1, false)[1]
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print(string.format("Current line [%d] has %d bytes",
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linenr, #curline))
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EOF
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endfunction
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Note that the `local` variables will disappear when block finishes. This is
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not the case for globals.
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*:luado*
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:[range]luado {body} Execute Lua function "function (line, linenr) {body}
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end" for each line in the [range], with the function
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argument being set to the text of each line in turn,
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without a trailing <EOL>, and the current line number.
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If the value returned by the function is a string it
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becomes the text of the line in the current turn. The
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default for [range] is the whole file: "1,$".
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Examples:
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>
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:luado return string.format("%s\t%d", line:reverse(), #line)
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:lua require"lpeg"
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:lua -- balanced parenthesis grammar:
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:lua bp = lpeg.P{ "(" * ((1 - lpeg.S"()") + lpeg.V(1))^0 * ")" }
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:luado if bp:match(line) then return "-->\t" .. line end
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<
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*:luafile*
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:[range]luafile {file}
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Execute Lua script in {file}.
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The whole argument is used as a single file name.
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Examples:
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>
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:luafile script.lua
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:luafile %
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<
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All these commands execute a Lua chunk from either the command line (:lua and
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:luado) or a file (:luafile) with the given line [range]. Similarly to the Lua
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interpreter, each chunk has its own scope and so only global variables are
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shared between command calls. All Lua default libraries are available. In
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addition, Lua "print" function has its output redirected to the Nvim message
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area, with arguments separated by a white space instead of a tab.
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Lua uses the "vim" module (see |lua-vim|) to issue commands to Nvim. However,
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procedures that alter buffer content, open new buffers, and change cursor
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position are restricted when the command is executed in the |sandbox|.
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==============================================================================
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luaeval() *lua-eval* *luaeval()*
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The (dual) equivalent of "vim.eval" for passing Lua values to Nvim is
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"luaeval". "luaeval" takes an expression string and an optional argument used
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for _A inside expression and returns the result of the expression. It is
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semantically equivalent in Lua to:
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>
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local chunkheader = "local _A = select(1, ...) return "
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function luaeval (expstr, arg)
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local chunk = assert(loadstring(chunkheader .. expstr, "luaeval"))
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return chunk(arg) -- return typval
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end
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Lua nils, numbers, strings, tables and booleans are converted to their
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respective VimL types. An error is thrown if conversion of any other Lua types
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is attempted.
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The magic global "_A" contains the second argument to luaeval().
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Example: >
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:echo luaeval('_A[1] + _A[2]', [40, 2])
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42
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:echo luaeval('string.match(_A, "[a-z]+")', 'XYXfoo123')
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foo
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Lua tables are used as both dictionaries and lists, so it is impossible to
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determine whether empty table is meant to be empty list or empty dictionary.
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Additionally lua does not have integer numbers. To distinguish between these
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cases there is the following agreement:
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0. Empty table is empty list.
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1. Table with N incrementally growing integral numbers, starting from 1 and
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ending with N is considered to be a list.
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2. Table with string keys, none of which contains NUL byte, is considered to
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be a dictionary.
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3. Table with string keys, at least one of which contains NUL byte, is also
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considered to be a dictionary, but this time it is converted to
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a |msgpack-special-map|.
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*lua-special-tbl*
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4. Table with `vim.type_idx` key may be a dictionary, a list or floating-point
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value:
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- `{[vim.type_idx]=vim.types.float, [vim.val_idx]=1}` is converted to
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a floating-point 1.0. Note that by default integral lua numbers are
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converted to |Number|s, non-integral are converted to |Float|s. This
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variant allows integral |Float|s.
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- `{[vim.type_idx]=vim.types.dictionary}` is converted to an empty
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dictionary, `{[vim.type_idx]=vim.types.dictionary, [42]=1, a=2}` is
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converted to a dictionary `{'a': 42}`: non-string keys are ignored.
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Without `vim.type_idx` key tables with keys not fitting in 1., 2. or 3.
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are errors.
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- `{[vim.type_idx]=vim.types.list}` is converted to an empty list. As well
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as `{[vim.type_idx]=vim.types.list, [42]=1}`: integral keys that do not
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form a 1-step sequence from 1 to N are ignored, as well as all
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non-integral keys.
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Examples: >
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:echo luaeval('math.pi')
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:function Rand(x,y) " random uniform between x and y
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: return luaeval('(_A.y-_A.x)*math.random()+_A.x', {'x':a:x,'y':a:y})
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: endfunction
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:echo Rand(1,10)
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Note that currently second argument to `luaeval` undergoes VimL to lua
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conversion, so changing containers in lua do not affect values in VimL. Return
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value is also always converted. When converting, |msgpack-special-dict|s are
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treated specially.
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==============================================================================
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Lua standard modules *lua-stdlib*
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The Nvim Lua "standard library" (stdlib) is the `vim` module, which exposes
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various functions and sub-modules. It is always loaded, thus require("vim")
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is unnecessary.
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You can peek at the module properties: >
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:lua print(vim.inspect(vim))
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Result is something like this: >
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{
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_os_proc_children = <function 1>,
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_os_proc_info = <function 2>,
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...
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api = {
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nvim__id = <function 5>,
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nvim__id_array = <function 6>,
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...
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},
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deepcopy = <function 106>,
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gsplit = <function 107>,
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...
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}
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To find documentation on e.g. the "deepcopy" function: >
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:help vim.deepcopy
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Note that underscore-prefixed functions (e.g. "_os_proc_children") are
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internal/private and must not be used by plugins.
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------------------------------------------------------------------------------
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VIM.API *lua-api*
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`vim.api` exposes the full Nvim |API| as a table of Lua functions.
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Example: to use the "nvim_get_current_line()" API function, call
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"vim.api.nvim_get_current_line()": >
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print(tostring(vim.api.nvim_get_current_line()))
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------------------------------------------------------------------------------
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VIM.LOOP *lua-loop*
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`vim.loop` exposes all features of the Nvim event-loop. This is a lower-level
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API that provides functionality for networking, filesystem, and process
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management. Try this command to see available functions: >
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:lua print(vim.inspect(vim.loop))
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See http://docs.libuv.org for complete documentation.
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See https://github.com/luvit/luv/tree/master/examples for examples.
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Note: it is not safe to directly invoke the Nvim API from `vim.loop`
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callbacks. This will crash: >
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local timer = vim.loop.new_timer()
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timer:start(1000, 0, function()
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vim.api.nvim_command('sleep 100m') -- BROKEN, will crash.
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end)
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Instead wrap the API call with |vim.schedule()|. >
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local timer = vim.loop.new_timer()
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timer:start(1000, 0, function()
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vim.schedule(function() vim.api.nvim_command('sleep 100m') end)
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end)
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Example: repeating timer
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1. Save this code to a file.
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2. Execute it with ":luafile %". >
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-- Create a timer handle (implementation detail: uv_timer_t).
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local timer = vim.loop.new_timer()
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local i = 0
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-- Waits 1000ms, then repeats every 750ms until timer:close().
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timer:start(1000, 750, function()
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print('timer invoked! i='..tostring(i))
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if i > 4 then
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timer:close() -- Always close handles to avoid leaks.
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end
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i = i + 1
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end)
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print('sleeping');
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Example: TCP echo-server *tcp-server*
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1. Save this code to a file.
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2. Execute it with ":luafile %".
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3. Note the port number.
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4. Connect from any TCP client (e.g. "nc 0.0.0.0 36795"): >
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local function create_server(host, port, on_connection)
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local server = vim.loop.new_tcp()
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server:bind(host, port)
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server:listen(128, function(err)
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assert(not err, err) -- Check for errors.
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local sock = vim.loop.new_tcp()
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server:accept(sock) -- Accept client connection.
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on_connection(sock) -- Start reading messages.
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end)
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return server
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end
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local server = create_server('0.0.0.0', 0, function(sock)
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sock:read_start(function(err, chunk)
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assert(not err, err) -- Check for errors.
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if chunk then
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sock:write(chunk) -- Echo received messages to the channel.
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else -- EOF (stream closed).
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sock:close() -- Always close handles to avoid leaks.
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end
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end)
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end)
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print('TCP echo-server listening on port: '..server:getsockname().port)
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------------------------------------------------------------------------------
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VIM *lua-util*
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vim.stricmp({a}, {b}) *vim.stricmp()*
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Compares strings case-insensitively. Returns 0, 1 or -1 if strings
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are equal, {a} is greater than {b} or {a} is lesser than {b},
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respectively.
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vim.schedule({callback}) *vim.schedule()*
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Schedules {callback} to be invoked soon by the main event-loop. Useful
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to avoid |textlock| or other temporary restrictions.
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vim.type_idx *vim.type_idx*
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Type index for use in |lua-special-tbl|. Specifying one of the
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values from |vim.types| allows typing the empty table (it is
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unclear whether empty lua table represents empty list or empty array)
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and forcing integral numbers to be |Float|. See |lua-special-tbl| for
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more details.
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vim.val_idx *vim.val_idx*
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Value index for tables representing |Float|s. A table representing
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floating-point value 1.0 looks like this: >
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{
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[vim.type_idx] = vim.types.float,
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[vim.val_idx] = 1.0,
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}
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< See also |vim.type_idx| and |lua-special-tbl|.
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vim.types *vim.types*
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Table with possible values for |vim.type_idx|. Contains two sets
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of key-value pairs: first maps possible values for |vim.type_idx|
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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.
|
||
|
||
==============================================================================
|
||
Lua module: vim *lua-vim*
|
||
|
||
inspect({object}, {options}) *vim.inspect()*
|
||
Return a human-readable representation of the given object.
|
||
|
||
See also: ~
|
||
https://github.com/kikito/inspect.lua
|
||
|
||
|
||
|
||
|
||
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.
|
||
|
||
Parameters: ~
|
||
{orig} Table to copy
|
||
|
||
Return: ~
|
||
New table of copied keys and (nested) values.
|
||
|
||
gsplit({s}, {sep}, {plain}) *vim.gsplit()*
|
||
Splits a string at each instance of a separator.
|
||
|
||
Parameters: ~
|
||
{s} String to split
|
||
{sep} Separator string or pattern
|
||
{plain} If `true` use `sep` literally (passed to
|
||
String.find)
|
||
|
||
Return: ~
|
||
Iterator over the split components
|
||
|
||
See also: ~
|
||
|vim.split()|
|
||
https://www.lua.org/pil/20.2.html
|
||
http://lua-users.org/wiki/StringLibraryTutorial
|
||
|
||
split({s}, {sep}, {plain}) *vim.split()*
|
||
Splits a string at each instance of a separator.
|
||
|
||
Examples: >
|
||
split(":aa::b:", ":") --> {'','aa','','bb',''}
|
||
split("axaby", "ab?") --> {'','x','y'}
|
||
split(x*yz*o, "*", true) --> {'x','yz','o'}
|
||
<
|
||
|
||
Parameters: ~
|
||
{s} String to split
|
||
{sep} Separator string or pattern
|
||
{plain} If `true` use `sep` literally (passed to
|
||
String.find)
|
||
|
||
Return: ~
|
||
List-like table of the split components.
|
||
|
||
See also: ~
|
||
|vim.gsplit()|
|
||
|
||
tbl_contains({t}, {value}) *vim.tbl_contains()*
|
||
Checks if a list-like (vector) table contains `value` .
|
||
|
||
Parameters: ~
|
||
{t} Table to check
|
||
{value} Value to compare
|
||
|
||
Return: ~
|
||
true if `t` contains `value`
|
||
|
||
tbl_extend({behavior}, {...}) *vim.tbl_extend()*
|
||
Merges two or more map-like tables.
|
||
|
||
Parameters: ~
|
||
{behavior} 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
|
||
{...} Two or more map-like tables.
|
||
|
||
See also: ~
|
||
|extend()|
|
||
|
||
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} List-like table
|
||
|
||
Return: ~
|
||
Flattened copy of the given list-like table.
|
||
|
||
trim({s}) *vim.trim()*
|
||
Trim whitespace (Lua pattern "%s") from both sides of a
|
||
string.
|
||
|
||
Parameters: ~
|
||
{s} String to trim
|
||
|
||
Return: ~
|
||
String with whitespace removed from its beginning and end
|
||
|
||
See also: ~
|
||
https://www.lua.org/pil/20.2.html
|
||
|
||
vim:tw=78:ts=8:ft=help:norl:
|