1 *if_lua.txt* For Vim version 7.2. Last change: 2008 Aug 31
4 VIM REFERENCE MANUAL by Luis Carvalho
7 The Lua Interface to Vim *lua* *Lua*
9 1. Commands |lua-commands|
10 2. The vim module |lua-vim|
11 3. Buffer userdata |lua-buffer|
12 4. Window userdata |lua-window|
14 {Vi does not have any of these commands}
16 The Lua interface is available only when Vim was compiled with the
19 ==============================================================================
20 1. Commands *lua-commands*
24 Execute Lua chunk {chunk}. {not in Vi}
28 :lua print("Hello, Vim!")
29 :lua local curbuf = vim.buffer() curbuf[7] = "line #7"
32 :[range]lua << {endmarker}
35 Execute Lua script {script}. {not in Vi}
36 Note: This command doesn't work when the Lua
37 feature wasn't compiled in. To avoid errors, see
40 {endmarker} must NOT be preceded by any white space. If {endmarker} is
41 omitted from after the "<<", a dot '.' must be used after {script}, like
42 for the |:append| and |:insert| commands.
43 This form of the |:lua| command is mainly useful for including Lua code
48 function! CurrentLineInfo()
50 local linenr = vim.window().line
51 local curline = vim.buffer()[linenr]
52 print(string.format("Current line [%d] has %d chars",
59 :[range]luado {body} Execute Lua function$function (line)${body}$end$ for
60 each line in the [range], with the function argument
61 being set to the text of each line in turn, without a
62 trailing <EOL>. If the value returned by the function
63 is a string it becomes the text of the line in the
64 current turn. The default for [range] is the whole
65 file: "1,$". {not in Vi}
69 :luado return string.format("%s\t%d", line:reverse(), #line)
72 :lua -- balanced parenthesis grammar:
73 :lua bp = lpeg.P{ "(" * ((1 - lpeg.S"()") + lpeg.V(1))^0 * ")" }
74 :luado if bp:match(line) then return "-->\t" .. line end
78 :[range]luafile {file}
79 Execute Lua script in {file}. {not in Vi}
80 The whole argument is used as a single file name.
88 All these commands execute a Lua chunk from either the command line (:lua and
89 :luado) or a file (:luafile) with the given line [range]. Similarly to the Lua
90 interpreter, each chunk has its own scope and so only global variables are
91 shared between command calls. Lua default libraries$table$,$string$,$math$,
92 and$package$are available,$io$and$debug$are not, and$os$is restricted to
93 functions$date$,$clock$,$time$,$difftime$, and$getenv$. In addition,
94 Lua$print$function has its output redirected to the Vim message area, with
95 arguments separated by a white space instead of a tab.
97 Lua uses the "vim" module (see|lua-vim|) to issue commands to Vim
98 and manage buffers (|lua-buffer|) and windows (|lua-window|). However,
99 procedures that alter buffer content, open new buffers, and change cursor
100 position are restricted when the command is executed in the|sandbox|.
103 ==============================================================================
104 2. The vim module *lua-vim*
106 Lua interfaces Vim through the "vim" module. The first and last line of the
107 input range are stored in$vim.firstline$and$vim.lastline$respectively. The
108 module also includes routines for buffer, window, and current line queries,
109 Vim evaluation and command execution, and others.
111 $vim.isbuffer(value)$ Returns#true#if$value$is a buffer userdata and
112 $false$otherwise (see|lua-buffer|).
114 $vim.buffer($[arg]$)$ If$arg$is a number, returns buffer with number
115 $arg$in the buffer list or, if$arg$is
116 a string, returns buffer whose full or short
117 name is$arg$. In both cases, returns#nil#if
118 the buffer is not found. Otherwise, if
119 $toboolean(arg)$is#true#returns the first
120 buffer in the buffer list or else the current
123 $vim.iswindow(value)$ Returns#true#if$value$is a window userdata and
124 $false$otherwise (see|lua-window|).
126 $vim.window($[arg]$)$ If$arg$is a number, returns window with number
127 $arg$or#nil#if not found. Otherwise, if
128 $toboolean(arg)$is#true#returns the first
129 window or else the current window.
131 $vim.command(${cmd}$)$ Executes the vim (ex-mode) command {cmd}.
133 :lua vim.command"set tw=60"
134 :lua vim.command"normal ddp"
136 $vim.eval(${expr}$)$ Evaluates expression {expr} (see|expression|),
137 converts the result to Lua, and returns it.
138 Vim strings and numbers are directly converted
139 to Lua strings and numbers respectively. Vim
140 lists and dictionaries are converted to Lua
141 tables (lists become integer-keyed tables).
143 :lua tw = vim.eval"&tw"
144 :lua print(vim.eval"{'a': 'one'}".a)
146 $vim.line()$ Returns the current line (without the trailing
147 <EOL>), a Lua string.
151 $vim.open(${fname}$)$ Opens a new buffer for file {fname} and
152 returns it. Note that the buffer is not set as
156 ==============================================================================
157 3. Buffer userdata *lua-buffer*
159 Buffer userdata represent vim buffers. A buffer userdata$b$has the following
160 properties and methods:
164 #o#$b()$sets$b$as the current buffer.
165 #o#$#b$is the number of lines in buffer$b$.
166 #o#$b[k]$represents line number$k$:$b[k] = newline$replaces line$k$
167 with string$newline$and$b[k] =$#nil#deletes line$k$.
168 #o#$b.name$contains the short name of buffer$b$(read-only).
169 #o#$b.fname$contains the full name of buffer$b$(read-only).
170 #o#$b.number$contains the position of buffer$b$in the buffer list
175 #o#$b:insert(newline$[, pos]$)$inserts string$newline$at position$pos$
176 in the buffer. The default value for$pos$is$#b + 1$. If$pos == 0$
177 then$newline$becomes the first line in the buffer.
178 #o#$b:next()$returns the buffer next to$b$in the buffer list.
179 #o#$b:previous()$returns the buffer previous to$b$in the buffer list.
180 #o#$b:isvalid()$returns#true#if buffer$b$corresponds to a "real" (not
181 freed from memory) Vim buffer.
185 :lua b = vim.buffer() -- current buffer
186 :lua print(b.name, b.number)
187 :lua b[1] = "first line"
188 :lua b:insert("FIRST!", 0)
189 :lua b[1] = nil -- delete top line
190 :lua for i=1,3 do b:insert(math.random()) end
191 :3,4lua for i=vim.lastline,vim.firstline,-1 do b[i] = nil end
192 :lua vim.open"myfile"() -- open buffer and set it as current
194 function! ListBuffers()
196 local b = vim.buffer(true) -- first buffer in list
198 print(b.number, b.name, #b)
206 ==============================================================================
207 4. Window userdata *lua-window*
209 Window objects represent vim windows. A window userdata$w$has the following
210 properties and methods:
214 #o#$w()$sets$w$as the current window.
215 #o#$w.buffer$contains the buffer of window$w$(read-only).
216 #o#$w.line$represents the cursor line position in window$w$.
217 #o#$w.col$represents the cursor column position in window$w$.
218 #o#$w.width$represents the width of window$w$.
219 #o#$w.height$represents the height of window$w$.
223 #o#$w:next()$returns the window next to$w$.
224 #o#$w:previous()$returns the window previous to$w$.
225 #o#$w:isvalid()$returns#true#if window$w$corresponds to a "real" (not
226 freed from memory) Vim window.
230 :lua w = vim.window() -- current window
231 :lua print(w.buffer.name, w.line, w.col)
232 :lua w.width = w.width + math.random(10)
233 :lua w.height = 2 * math.random() * w.height
234 :lua n,w = 0,vim.window(true) while w~=nil do n,w = n + 1,w:next() end
235 :lua print("There are " .. n .. " windows")
238 ==============================================================================
239 vim:tw=78:ts=8:ft=help:norl: