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<title>Vim scripting cheatsheet</title>
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<h1 class='h1'>Vim scripting <em>cheatsheet</em></h1>
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<h3 id="start-hacking">Start hacking</h3>
<pre><code class="language-vim">let name = "John"
echo "Hello, " . name
</code></pre>
<p>You can either put this in a script (<code>script.vim</code>) and run it (<code>:source script.vim</code>), or you can type the commands individually in normal mode as <code>:let</code> and <code>:echo</code>.</p>
<h3 id="learn-by-example">Learn by example</h3>
<pre><code class="language-vim">function! SuperTab()
let l:part = strpart(getline('.'),col('.')-2,1)
if (l:part =~ '^\W\?$')
return "\&lt;Tab&gt;"
else
return "\&lt;C-n&gt;"
endif
endfunction
imap &lt;Tab&gt; &lt;C-R&gt;=SuperTab()&lt;CR&gt;
</code></pre>
<p><a href="http://www.vimbits.com/bits/46">Here</a>s another example with <a href="#functions">functions</a>, <a href="#variables">variables</a> and <a href="#mapping">mapping</a>.</p>
<h2 id="variables">Variables</h2>
<h3 class="-prime" id="defining">Defining</h3>
<pre><code class="language-vim">let var = "hello"
</code></pre>
<h3 id="variable-prefixes">Variable prefixes</h3>
<pre><code class="language-vim">let g:ack_options = '-s -H' " g: global
let s:ack_program = 'ack' " s: local (to script)
let l:foo = 'bar' " l: local (to function)
</code></pre>
<p>The <code>s:</code> prefix is also available in function names. See <code>:help local-variables</code></p>
<h3 id="other-prefixes">Other prefixes</h3>
<pre><code class="language-vim">let w:foo = 'bar' " w: window
let b:state = 'on' " b: buffer
let t:state = 'off' " t: tab
echo v:var " v: vim special
</code></pre>
<pre><code class="language-vim">let @/ = '' " @ register (this clears last search pattern)
echo $PATH " $ env
</code></pre>
<h3 id="vim-options">Vim options</h3>
<pre><code class="language-vim">echo 'tabstop is ' . &amp;tabstop
if &amp;insertmode
echo &amp;g:option
echo &amp;l:option
</code></pre>
<p>Prefix Vim options with <code>&amp;</code></p>
<h3 id="operators">Operators</h3>
<pre><code class="language-vim">a + b " numbers only!
'hello ' . name " concat
</code></pre>
<pre><code class="language-vim">let var -= 2
let var += 5
let var .= 'string' " concat
</code></pre>
<h2 id="strings">Strings</h2>
<h3 id="strings-1">Strings</h3>
<pre><code class="language-vim">let str = "String"
let str = "String with \n newline"
let literal = 'literal, no \ escaping'
let literal = 'that''s enough' " double '' =&gt; '
echo "result = " . re " concatenation
</code></pre>
<p>Also see <code>:help literal-string</code> and <code>:help expr-quote</code>.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/26.html">Strings</a></p>
<h3 id="string-functions">String functions</h3>
<pre><code class="language-vim">strlen(str) " length
len(str) " same
strchars(str) " character length
split("one two three") "=&gt; ['one', 'two', 'three']
split("one.two.three", '.') "=&gt; ['one', 'two', 'three']
join(['a', 'b'], ',') "=&gt; 'a,b'
tolower('Hello')
toupper('Hello')
</code></pre>
<p>Also see <code>:help functions</code>
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/27.html">String functions</a></p>
<h2 id="functions">Functions</h2>
<h3 class="-prime" id="functions-1">Functions</h3>
<pre><code class="language-vim">" prefix with s: for local script-only functions
function! s:Initialize(cmd, args)
" a: prefix for arguments
echo "Command: " . a:cmd
return 1
endfunction
</code></pre>
<p>See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/23.html">Functions</a></p>
<h3 id="overwriting">Overwriting</h3>
<pre><code class="language-vim">function f1()
echo "f1"
endfunction
function! f1()
echo "f1 overridden"
endfunction
</code></pre>
<p>If you define two functions with the same name, Vim will throw an error complaining that the function <code>f1</code> already exists. To overwrite the previous function with the same name, add a <code>!</code> after the function keyword.</p>
<h3 id="namespacing">Namespacing</h3>
<pre><code class="language-vim">function! myplugin#hello()
</code></pre>
<h3 id="calling-functions">Calling functions</h3>
<pre><code class="language-vim">call s:Initialize()
call s:Initialize("hello")
</code></pre>
<h3 id="consuming-return-values">Consuming return values</h3>
<pre><code class="language-vim">echo "Result: " . s:Initialize()
</code></pre>
<h3 id="abortable">Abortable</h3>
<pre><code class="language-vim">function! myfunction() abort
endfunction
</code></pre>
<p>Aborts when an error occurs.</p>
<h3 id="var-arguments">Var arguments</h3>
<pre><code class="language-vim">function! infect(...)
echo a:0 "=&gt; 2
echo a:1 "=&gt; jake
echo a:2 "=&gt; bella
for s in a:000 " a list
echon ' ' . s
endfor
endfunction
infect('jake', 'bella')
</code></pre>
<p>See <code>:help function-argument</code>. See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/24.html">Var arguments</a></p>
<h2 id="loops">Loops</h2>
<pre><code class="language-vim">for s in list
echo s
continue " jump to start of loop
break " breaks out of a loop
endfor
</code></pre>
<pre><code class="language-vim">while x &lt; 5
endwhile
</code></pre>
<h2 id="custom-commands">Custom commands</h2>
<h3 class="-prime" id="custom-commands-1">Custom commands</h3>
<pre><code class="language-vim">command! Save :set fo=want tw=80 nowrap
</code></pre>
<p>Custom commands start with uppercase letters. The <code>!</code> redefines a command if it already exists.</p>
<h3 id="commands-calling-functions">Commands calling functions</h3>
<pre class="-setup"><code class="language-vim">command! Save call &lt;SID&gt;foo()
</code></pre>
<pre><code class="language-vim">function! s:foo()
...
endfunction
</code></pre>
<h3 id="commands-with-arguments">Commands with arguments</h3>
<pre class="-setup"><code class="language-vim">command! -nargs=? Save call script#foo(&lt;args&gt;)
</code></pre>
<table>
<thead>
<tr>
<th>What</th>
<th>What</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>-nargs=0</code></td>
<td>0 arguments, default</td>
</tr>
<tr>
<td><code>-nargs=1</code></td>
<td>1 argument, includes spaces</td>
</tr>
<tr>
<td><code>-nargs=?</code></td>
<td>0 or 1 argument</td>
</tr>
<tr>
<td><code>-nargs=*</code></td>
<td>0+ arguments, space separated</td>
</tr>
<tr>
<td><code>-nargs=+</code></td>
<td>1+ arguments, space reparated</td>
</tr>
</tbody>
</table>
<h2 id="flow">Flow</h2>
<h3 id="conditionals">Conditionals</h3>
<pre><code class="language-vim">let char = getchar()
if char == "\&lt;LeftMouse&gt;"
" ...
elseif char == "\&lt;RightMouse&gt;"
" ...
else
" ...
endif
</code></pre>
<h3 id="truthiness">Truthiness</h3>
<pre><code class="language-vim">if 1 | echo "true" | endif
if 0 | echo "false" | endif
</code></pre>
<pre><code class="language-vim">if 1 "=&gt; 1 (true)
if 0 "=&gt; 0 (false)
if "1" "=&gt; 1 (true)
if "456" "=&gt; 1 (true)
if "xfz" "=&gt; 0 (false)
</code></pre>
<p>No booleans. <code>0</code> is false, <code>1</code> is true.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/21.html">Truthiness</a></p>
<h3 id="operators-1">Operators</h3>
<pre><code class="language-vim">if 3 &gt; 2
if a &amp;&amp; b
if (a &amp;&amp; b) || (c &amp;&amp; d)
if !c
</code></pre>
<p>See <code>:help expression-syntax</code>.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/22.html">Operators</a></p>
<h3 id="strings-2">Strings</h3>
<pre><code class="language-vim">if name ==# 'John' " case-sensitive
if name ==? 'John' " case-insensitive
if name == 'John' " depends on :set ignorecase
" also: is#, is?, &gt;=#, &gt;=?, and so on
</code></pre>
<h3 id="identity-operators">Identity operators</h3>
<pre><code class="language-vim">a is b
a isnot b
</code></pre>
<p>Checks if its the same instance object.</p>
<h3 id="regexp-matches">Regexp matches</h3>
<pre><code class="language-vim">"hello" =~ 'xx*'
"hello" !~ 'xx*'
"hello" =~ '\v&lt;\d+&gt;'
</code></pre>
<p><code>\v</code> enables “extended” regex mode which allows word boundary (<code>&lt;&gt;</code>), <code>+</code>, and more.</p>
<h3 id="single-line">Single line</h3>
<pre><code class="language-vim">if empty(a:path) | return [] | endif
a ? b : c
</code></pre>
<p>Use <code>|</code> to join lines together.</p>
<h3 id="boolean-logic">Boolean logic</h3>
<pre><code class="language-vim">if g:use_dispatch &amp;&amp; s:has_dispatch
···
endif
</code></pre>
<h2 id="lists">Lists</h2>
<h3 id="lists-1">Lists</h3>
<pre><code class="language-vim">let mylist = [1, two, 3, "four"]
let first = mylist[0]
let last = mylist[-1]
" Suppresses errors
let second = get(mylist, 1)
let second = get(mylist, 1, "NONE")
</code></pre>
<h3 id="functions-2">Functions</h3>
<pre><code class="language-vim">len(mylist)
empty(mylist)
sort(list)
let sortedlist = sort(copy(list))
split('hello there world', ' ')
</code></pre>
<h3 id="concatenation">Concatenation</h3>
<pre><code class="language-vim">let longlist = mylist + [5, 6]
let mylist += [7, 8]
</code></pre>
<h3 id="sublists">Sublists</h3>
<pre><code class="language-vim">let shortlist = mylist[2:-1]
let shortlist = mylist[2:] " same
let shortlist = mylist[2:2] " one item
</code></pre>
<h3 id="push">Push</h3>
<pre><code class="language-vim">let alist = [1, 2, 3]
let alist = add(alist, 4)
</code></pre>
<h3 id="map">Map</h3>
<pre><code class="language-vim">call map(files, "bufname(v:val)") " use v:val for value
call filter(files, 'v:val != ""')
</code></pre>
<h2 id="dictionaries">Dictionaries</h2>
<h3 id="dictionaries-1">Dictionaries</h3>
<pre><code class="language-vim">let colors = {
\ "apple": "red",
\ "banana": "yellow"
}
echo colors["a"]
echo get(colors, "apple") " suppress error
</code></pre>
<p>See <code>:help dict</code></p>
<h3 id="using-dictionaries">Using dictionaries</h3>
<pre><code class="language-vim">remove(colors, "apple")
</code></pre>
<pre><code class="language-vim">" :help E715
if has_key(dict, 'foo')
if empty(dict)
keys(dict)
len(dict)
</code></pre>
<pre><code class="language-vim">max(dict)
min(dict)
</code></pre>
<pre><code class="language-vim">count(dict, 'x')
string(dict)
</code></pre>
<pre><code class="language-vim">map(dict, '&lt;&gt;&gt; " . v:val')
</code></pre>
<h3 id="iteration">Iteration</h3>
<pre><code class="language-vim">for key in keys(mydict)
echo key . ': ' . mydict[key]
endfor
</code></pre>
<h3 id="prefixes">Prefixes</h3>
<pre><code class="language-vim">keys(s:)
</code></pre>
<p>Prefixes (<code>s:</code>, <code>g:</code>, <code>l:</code>, etc) are actually dictionaries.</p>
<h3 id="extending">Extending</h3>
<pre><code class="language-vim">" Extending with more
let extend(s:fruits, { ... })
</code></pre>
<h2 id="casting">Casting</h2>
<pre><code class="language-vim">str2float("2.3")
str2nr("3")
float2nr("3.14")
</code></pre>
<h2 id="numbers">Numbers</h2>
<h3 class="-prime" id="numbers-1">Numbers</h3>
<pre><code class="language-vim">let int = 1000
let int = 0xff
let int = 0755 " octal
</code></pre>
<p>See <code>:help Number</code>.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/25.html">Numbers</a></p>
<h3 id="floats">Floats</h3>
<pre><code class="language-vim">let fl = 100.1
let fl = 5.4e4
</code></pre>
<p>See <code>:help Float</code></p>
<h3 id="arithmetic">Arithmetic</h3>
<pre><code class="language-vim">3 / 2 "=&gt; 1, integer division
3 / 2.0 "=&gt; 1.5
3 * 2.0 "=&gt; 6.0
</code></pre>
<h3 id="math-functions">Math functions</h3>
<pre><code class="language-vim">sqrt(100)
floor(3.5)
ceil(3.3)
abs(-3.4)
sin() cos() tan()
sinh() cosh() tanh()
asin() acos() atan()
</code></pre>
<h2 id="vim-isms">Vim-isms</h2>
<h3 id="execute-a-command">Execute a command</h3>
<pre><code class="language-vim">execute "vsplit"
execute "e " . fnameescape(filename)
</code></pre>
<p>Runs an ex command you typically run with <code>:</code>. Also see <code>:help execute</code>.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/28.html">Execute a command</a></p>
<h3 id="running-keystrokes">Running keystrokes</h3>
<pre><code class="language-vim">normal G
normal! G " skips key mappings
execute "normal! gg/foo\&lt;cr&gt;dd"
</code></pre>
<p>Use <code>:normal</code> to execute keystrokes as if youre typing them in normal mode. Combine with <code>:execute</code> for special keystrokes.
See: <a href="http://learnvimscriptthehardway.stevelosh.com/chapters/29.html">Running keystrokes</a></p>
<h3 id="getting-filenames">Getting filenames</h3>
<pre><code class="language-vim">echo expand("%") " path/file.txt
echo expand("%:t") " file.txt
echo expand("%:p:h") " /home/you/path/file.txt
echo expand("%:r") " path/file
echo expand("%:e") " txt
</code></pre>
<p>See <code>:help expand</code></p>
<h3 id="silencing">Silencing</h3>
<pre><code class="language-vim">silent g/Aap/p
</code></pre>
<p>Suppresses output. See <code>:help silent</code></p>
<h3 id="echo">Echo</h3>
<pre><code class="language-vim">echoerr 'oh it failed'
echomsg 'hello there'
echo 'hello'
echohl WarningMsg | echomsg "=&gt; " . a:msg | echohl None
</code></pre>
<h3 id="settings">Settings</h3>
<pre><code class="language-vim">set number
set nonumber
set number! " toggle
set numberwidth=5
set guioptions+=e
</code></pre>
<h3 id="prompts">Prompts</h3>
<pre><code class="language-vim">let result = confirm("Sure?")
execute "confirm q"
</code></pre>
<h3 id="built-ins">Built-ins</h3>
<pre><code class="language-vim">has("feature") " :h feature-list
executable("python")
globpath(&amp;rtp, "syntax/c.vim")
exists("$ENV")
exists(":command")
exists("variable")
exists("+option")
exists("g:...")
</code></pre>
<h2 class="-three-column" id="mapping">Mapping</h2>
<h3 id="mapping-commands">Mapping commands</h3>
<pre><code class="language-vim">nmap
vmap
imap
xmap
nnoremap
vnoremap
inoremap
xnoremap
...
</code></pre>
<h3 id="explanation">Explanation</h3>
<pre><code class="language-vim">[nvixso](nore)map
</code></pre>
<pre class="-setup"><code> │ └ don't recurse
└ normal, visual, insert,
eX mode, select, operator-pending
</code></pre>
<h3 id="arguments">Arguments</h3>
<table>
<tbody>
<tr>
<td><code>&lt;buffer&gt;</code></td>
<td>only in current buffer</td>
</tr>
<tr>
<td><code>&lt;silent&gt;</code></td>
<td>no echo</td>
</tr>
<tr>
<td><code>&lt;nowait&gt;</code></td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="syntax">Syntax</h2>
<h3 id="highlights">Highlights</h3>
<pre><code class="language-vim">hi Comment
term=bold,underline
gui=bold
ctermfg=4
guifg=#80a0ff
</code></pre>
<h3 id="filetype-detection">Filetype detection</h3>
<pre><code class="language-vim">augroup filetypedetect
au! BufNewFile,BufRead *.json setf javascript
augroup END
au Filetype markdown setlocal spell
</code></pre>
<h3 id="conceal">Conceal</h3>
<pre><code class="language-vim">set conceallevel=2
syn match newLine "&lt;br&gt;" conceal cchar=}
hi newLine guifg=green
</code></pre>
<h3 id="region-conceal">Region conceal</h3>
<pre><code class="language-vim">syn region inBold concealends matchgroup=bTag start="&lt;b&gt;" end="&lt;/b&gt;"
hi inBold gui=bold
hi bTag guifg=blue
</code></pre>
<h3 id="syntax-1">Syntax</h3>
<pre><code class="language-vim">syn match :name ":regex" :flags
syn region Comment start="/\*" end="\*/"
syn region String start=+"+ end=+"+ skip=+\\"+
syn cluster :name contains=:n1,:n2,:n3...
flags:
keepend
oneline
nextgroup=
contains=
contained
hi def link markdownH1 htmlH1
</code></pre>
<h3 id="include-guards">Include guards</h3>
<pre><code class="language-vim">if exists('g:loaded_myplugin')
finish
endif
" ...
let g:loaded_myplugin = 1
</code></pre>
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