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8 title="&dactyl.appName; Key Mappings"
10 xmlns:dactyl="&xmlns.dactyl;"
11 xmlns:html="&xmlns.html;">
13 <h1 tag="keyboard-shortcuts">Keyboard shortcuts and commands</h1>
17 &dactyl.appName; provides a number of commands to change the
18 behavior of key presses. This can mean anything from
19 automatically substituting one key for another or automatically
20 replacing one typed word for another, to launching a dialog or
24 <h2 tag="key-mapping mapping map macro">Key mapping</h2>
27 Key mappings are the most basic means &dactyl.appName; provides
28 for altering the actions of key presses. Each key mapping is
29 associated with a mode, such as <link topic="insert-mode">insert</link>,
30 <link>normal</link>, or
31 <link topic="command-line-mode">command-line</link>, and only
32 has effect when that mode is active. Although each mode has a
33 full suite of internal mappings, they may be easily augmented,
34 altered, or removed with the <ex>:map</ex> command and its
35 variants. These commands, in essence, allow the user to quickly
36 substitute one sequence of key presses for another.
40 <code><ex>:map <k name="F2" link="false"/></ex> <ex>:echo Date()<k name="CR"/></ex></code>
43 causes “<ex>:echo Date()<k name="CR"/></ex>” to be typed out
44 whenever <k name="F2" link="false"/> is pressed, thus echoing the full date
49 Standard key mapping commands are provided for the five most
54 <dt>n</dt> <dd>Normal mode: When browsing normally</dd>
55 <dt>v</dt> <dd>Visual mode: When selecting text with the cursor keys</dd>
56 <dt>i</dt> <dd>Insert mode: When interacting with text fields on a website</dd>
57 <dt>t</dt> <dd>TextEdit mode: When editing text fields in Vim-like NORMAL mode</dd>
58 <dt>c</dt> <dd>Command-line mode: When typing into the &dactyl.appName; command line</dd>
62 The ordinary <ex>:map</ex> and <ex>:noremap</ex> commands
63 add mappings for normal and visual mode. In order to map key
64 bindings in a different mode, any of the mapping commands may be
65 prefixed with one of the above letters. For instance,
66 <ex>:imap</ex> creates a new key mapping in insert mode, while
67 <ex>:cunmap</ex> removes a key mapping from command-line mode.
68 Other modes can be specified using the -modes option described below.
72 It is important to note that mappings are <em>not</em>
73 automatically saved between sessions. In order to preserve them,
74 they must either be added to your <tt><t>&dactyl.name;rc</t></tt> or
75 saved via the <ex>:mk&dactyl.name;rc</ex> command.
78 <h3 tag=":map-commands">Map commands</h3>
82 <spec>:map <a>lhs</a> <a>rhs</a></spec>
83 <tags>:nm :nmap</tags>
84 <spec>:nm<oa>ap</oa> <a>lhs</a> <a>rhs</a></spec>
85 <tags>:vm :vmap</tags>
86 <spec>:vm<oa>ap</oa> <a>lhs</a> <a>rhs</a></spec>
87 <tags>:im :imap</tags>
88 <spec>:im<oa>ap</oa> <a>lhs</a> <a>rhs</a></spec>
89 <tags>:tm :tmap</tags>
90 <spec>:tm<oa>ap</oa> <a>lhs</a> <a>rhs</a></spec>
91 <tags>:cm :cmap</tags>
92 <spec>:cm<oa>ap</oa> <a>lhs</a> <a>rhs</a></spec>
95 Map the <t>key-sequence</t> <a>lhs</a> to <a>rhs</a> for
96 the applicable mode(s). The keys of <a>rhs</a> respect
97 user-defined mappings, so the following will result in
100 <code><ex>:map a b</ex>
101 <ex>:map b a</ex></code>
103 In order to avoid this shortcoming, the <ex>:noremap</ex> command
104 or the <em>-builtin</em> option may be used.
109 <h3 tag=":map-options">Map options</h3>
111 Any of the map commands may be given the following options:
114 <dl dt="width: 12em;">
117 <dt>-arg</dt> <dd>Accept an argument after the requisite key press. Sets the <tt>arg</tt> parameter to the result. (short name <em>-a</em>)</dd>
118 <dt>-builtin</dt> <dd>Execute this mapping as if there were no user-defined mappings (short name <em>-b</em>)</dd>
119 <dt>-count</dt> <dd>Accept a count before the requisite key press. Sets the <tt>count</tt> parameter to the result. (short name <em>-c</em>)</dd>
120 <dt>-description</dt> <dd>A description of this mapping (short name <em>-d</em>)</dd>
121 <dt>-ex</dt> <dd>Execute <a>rhs</a> as an Ex command rather than keys (short name <em>-e</em>)</dd>
122 <dt>-group=<a>group</a></dt> <dd>Add this command to the given <t>group</t> (short name <em>-g</em>)</dd>
123 <dt>-javascript</dt> <dd>Execute <a>rhs</a> as JavaScript rather than keys (short names <em>-js</em>, <em>-j</em>)</dd>
124 <dt>-literal=<a>n</a></dt> <dd>Parse the <a>n</a>th argument without specially processing any quote or meta characters. (short name <em>-l</em>)</dd>
125 <dt>-modes</dt> <dd>Create this mapping in the given modes (short names <em>-mode</em>, <em>-m</em>)</dd>
126 <dt>-nopersist</dt> <dd>Do not save this mapping to an auto-generated rc file (short name <em>-n</em>)</dd>
127 <dt>-silent</dt> <dd>Do not echo any generated keys to the command line (short name <em>-s</em>, also <em><silent></em> for Vim compatibility)</dd>
131 <tags>:no :noremap</tags>
132 <spec>:no<oa>remap</oa> <a>lhs</a> <a>rhs</a></spec>
133 <tags>:nn :nnoremap</tags>
134 <spec>:nn<oa>oremap</oa> <a>lhs</a> <a>rhs</a></spec>
135 <tags>:vn :vnoremap</tags>
136 <spec>:vn<oa>oremap</oa> <a>lhs</a> <a>rhs</a></spec>
137 <tags>:ino :inoremap</tags>
138 <spec>:ino<oa>remap</oa> <a>lhs</a> <a>rhs</a></spec>
139 <tags>:tno :tnoremap</tags>
140 <spec>:tno<oa>remap</oa> <a>lhs</a> <a>rhs</a></spec>
141 <tags>:cno :cnoremap</tags>
142 <spec>:cno<oa>remap</oa> <a>lhs</a> <a>rhs</a></spec>
145 Map the <t>key-sequence</t> <a>lhs</a> to <a>rhs</a> for
146 the applicable mode(s). The keys in <a>rhs</a> do not
147 respect user-defined key mappings, so the following
148 effectively reverses the default meanings of the keys
149 <k>d</k> and <k>D</k>
151 <code><ex>:noremap d D</ex>
152 <ex>:noremap D d</ex></code>
157 <spec>:unmap <a>lhs</a></spec>
158 <tags>:unm :unmap</tags>
160 <spec>:nun<oa>map</oa> <a>lhs</a></spec>
161 <tags>:nun :nunmap</tags>
162 <spec>:nun<oa>map</oa>!</spec>
163 <spec>:vun<oa>map</oa> <a>lhs</a></spec>
164 <tags>:vun :vunmap</tags>
165 <spec>:vun<oa>map</oa>!</spec>
166 <spec>:iu<oa>nmap</oa> <a>lhs</a></spec>
167 <tags>:iu :iunmap</tags>
168 <spec>:iu<oa>nmap</oa>!</spec>
169 <spec>:tu<oa>nmap</oa> <a>lhs</a></spec>
170 <tags>:tu :tunmap</tags>
171 <spec>:tu<oa>nmap</oa>!</spec>
172 <spec>:cu<oa>nmap</oa> <a>lhs</a></spec>
173 <tags>:cu :cunmap</tags>
174 <spec>:cu<oa>nmap</oa>!</spec>
176 <p>Remove the mapping of <a>lhs</a> (or all mappings if <oa>!</oa> is
177 given) for the applicable mode(s).</p>
183 <spec>:nm<oa>ap</oa></spec>
184 <spec>:vm<oa>ap</oa></spec>
185 <spec>:im<oa>ap</oa></spec>
186 <spec>:tm<oa>ap</oa></spec>
187 <spec>:cm<oa>ap</oa></spec>
190 List all mappings for the applicable mode(s). Mappings are
191 partitioned into <t>groups</t>.
198 <spec>:map <a>lhs</a></spec>
200 <spec>:nm<oa>ap</oa> <a>lhs</a></spec>
202 <spec>:vm<oa>ap</oa> <a>lhs</a></spec>
204 <spec>:im<oa>ap</oa> <a>lhs</a></spec>
206 <spec>:tm<oa>ap</oa> <a>lhs</a></spec>
208 <spec>:cm<oa>ap</oa> <a>lhs</a></spec>
210 <p>List all mappings starting with <a>lhs</a> for the applicable mode(s).</p>
214 <h3 tag=":map-timeout map-timeout">Mapping timeout</h3>
216 When &dactyl.appName; receives a key event that has a separate binding and
217 at the same time is part of a key chain, values of the <o>timeout</o> and
218 <o>timeoutlen</o> options are used to decide what to do. See the
219 documentation of those options for more information.
222 <h3 tag=":map-arguments">Special arguments</h3>
225 Below is an overview of which modes each map command applies to:
228 <!-- TODO: table format -->
231 :map :noremap :unmap :mapclear – both Normal and Visual modes
232 :nmap :nnoremap :nunmap :nmapclear – Normal mode
233 :vmap :vnoremap :vunmap :vmapclear – Visual mode
234 :imap :inoremap :iunmap :imapclear – Insert mode
235 :tmap :tnoremap :tunmap :tmapclear – Text Edit mode
236 :cmap :cnoremap :cunmap :cmapclear – Command-line mode
239 <h3 tag="key-notation key-sequence">Key sequences</h3>
242 Most keys in key sequences are represented simply by the
243 character that you see on the screen when you type them.
244 However, as a number of these characters have special meanings,
245 and a number of keys have no visual representation, a special
246 notation is required.
251 The first argument to the <ex>:map</ex> commands must be
252 <link topic="quoting">quoted</link> if it contains spaces,
253 quotation marks or back-slashes. A space may additionally be
254 typed as <k name="Space"/>.
257 As special key names start with the <em><</em> character,
258 a literal < must be typed as <k name="lt" link="false"/>.
261 <k name="Left"/>, <k name="Right"/>, <k name="Up"/>,
262 and <k name="Down"/> represent the standard arrow keys.
265 <k name="CapsLock" link="false"/>, <k name="NumLock" link="false"/>, <k name="Insert"/>
266 <k name="Del" link="false"/>, <k name="Tab"/>, <k name="PageUp"/>,
267 <k name="PageDown"/>, and <k name="Esc"/> work as
271 <k name="Return" link="false"/> or <k name="CR"/> represent the carriage
274 <li><k name="BS" link="false"/> represents the backspace key.</li>
275 <li><k name="F1"/> through <k name="F12" link="false"/> work as expected.</li>
277 <k name="K0" link="false"/> through <k name="K9" link="false"/> represent keys on the
281 <k name="Uxxxx" link="false"/>, where <em>xxxx</em> is any 4 hexadecimal
282 digits, represents the character at that Unicode codepoint.
283 For instance, <k name="U263a" link="false"/> represents ☺.
288 In order to represent key presses using the Control, Alt, Meta,
289 or Shift keys, the following prefixes may be used,
293 <li><k name="C-␣" link="false"/>: The control or ctrl key.</li>
294 <li><k name="A-␣" link="false"/>: The alt key.</li>
295 <li><k name="M-␣" link="false"/>: The meta key, windows key, or command key.</li>
296 <li><k name="S-␣" link="false"/>: The shift key.</li>
300 These prefixes can be combined however you see fit.
304 Within angle brackets all alphabetic characters are read as lowercase.
305 Uppercase characters can only be specified with the <em>S-</em> modifier.
309 The following key sequences are interpreted as described:
312 <dl dt="width: 10em;">
313 <dt><k link="false">xc</k></dt>
314 <dd>Type the ‘X’ key followed by the ‘C’ key.</dd>
316 <dt><k name="C-x" link="false">c</k></dt>
318 Type the ‘X’ key while holding the ‘Control’ key, followed
322 <dt><k name="C-2" link="false"/></dt>
323 <dd>Type the ‘2’ while holding the ‘Control’ key.</dd>
325 <dt><k name="C-@" link="false"/></dt>
326 <dd>Type the ‘@’ key while holding the ‘Control’ key.</dd>
328 <dt><k name="S-Space" link="false"/></dt>
329 <dd>Press the space bar while holding the ‘Shift’ key.</dd>
331 <dt><k name="C-A-j" link="false"/></dt>
332 <dd>Type the ‘J’ key while while holding both the ‘Control’ and ‘Alt’ keys.</dd>
334 <dt><k name="C-A-J" link="false"/></dt>
335 <dd>Exactly the same as above.</dd>
337 <dt><k name="C-A-S-j" link="false"/></dt>
338 <dd>Type the ‘J’ key while while holding both the ‘Control’, ‘Alt’, and ‘Shift’ keys.</dd>
341 <h3 tag=":map-special-chars">Special characters</h3>
344 <tags><![CDATA[<Nop>]]></tags>
346 <spec><![CDATA[<Nop>]]></spec>
349 Do nothing. This pseudo-key is useful for disabling a
350 specific builtin mapping. For example,
351 <ex>:map <k name="C-n"/> <k name="Nop"/></ex> will prevent <k name="C-n"/>
358 <tags><![CDATA[<Pass>]]></tags>
359 <spec><![CDATA[<Pass>]]></spec>
360 <description short="true">
362 Pass the events consumed by the last executed mapping through to &dactyl.host;.
368 <tags><![CDATA[<CR> map_return]]></tags>
370 <spec><![CDATA[<CR>]]></spec>
373 Expand to a line terminator in a key mapping. An Ex command in the <a>rhs</a> of a
374 mapping requires a line terminator after it so that it is executed when the
375 mapping is expanded. <k name="CR"/> should be used for this purpose.
381 <tags><![CDATA[<Leader> \]]></tags>
383 <spec><![CDATA[<Leader>]]></spec>
386 A pseudo-key which expands to the value of the <o>mapleader</o>
387 option. For example, by default,
389 <code><ex>:map <k name="Leader"/>h</ex> <ex>:echo <str>Hello</str><k name="CR"/></ex></code>
391 <code><ex>:map \h</ex> <ex>:echo <str>Hello</str><k name="CR"/></ex></code>
393 <set opt="mapleader"><str>,</str></set>
395 <code><ex>:map ,h</ex> <ex>:echo <str>Hello</str><k name="CR"/></ex></code>
399 <h2 tag="abbreviations">Abbreviations</h2>
402 In addition to basic mappings, &dactyl.appName; can also
403 automatically replace whole words after they've been typed.
404 These shortcuts are known as abbreviations, and are most often
405 useful for correcting spelling of commonly mistyped words, as
406 well as shortening the typing of oft-typed but long words or
407 phrases. There are three basic types of abbreviations, defined
408 by the types of characters they contain,
412 <li>‘full-id’ abbreviations consist entirely of keyword characters (e.g., ‘teh’, ‘msoft’).</li>
413 <li>‘end-id’ abbreviations end in keyword character but otherwise contains all non-keyword characters (e.g., ‘'i’).</li>
414 <li>‘non-id’ abbreviations end in a non-keyword character but otherwise contains any non-whitespace character (e.g., ‘def'’).</li>
415 <li>Strings which fit none of the above patterns can not be defined as abbreviations (e.g., ‘a'b’ and ‘a b’).</li>
419 For the purposes of abbreviations, keyword characters include
420 all non-whitespace characters except for single or double
421 quotation marks. Abbreviations are expanded as soon as any
422 non-keyword character, or the key <k name="C-]" mode="c"/>, is typed.
426 <tags>:ab :abbreviate</tags>
427 <spec>:ab<oa>breviate</oa> <oa>-group=<a>group</a></oa> <a>lhs</a> <a>rhs</a></spec>
428 <spec>:ab<oa>breviate</oa> <oa>-group=<a>group</a></oa> <a>lhs</a></spec>
429 <spec>:ab<oa>breviate</oa> <oa>-group=<a>group</a></oa></spec>
432 Abbreviate <a>lhs</a> to <a>rhs</a>. If only <a>lhs</a>
433 is given, list all abbreviations that start with
434 <a>lhs</a>. If no arguments are given, list all
439 If the <em>-javascript</em> (short names <em>-js</em>,
440 <em>-j</em>) option is given, <a>lhs</a> is expanded to
441 the value <em>return</em>ed by the JavaScript code
442 <a>rhs</a>. The code is evaluated with the variable
443 <em>editor</em> set to the editable element that the
444 abbreviation is currently being expanded in. The code
445 should <em>not</em> make any changes to the contents of
450 If <a>group</a> is specified then abbreviations are created or
451 listed for the given <t>group</t>.
457 <tags>:ca :cabbreviate</tags>
458 <spec>:ca<oa>bbreviate</oa> <a>lhs</a> <a>rhs</a></spec>
459 <spec>:ca<oa>bbreviate</oa> <a>lhs</a></spec>
460 <spec>:ca<oa>bbreviate</oa></spec>
463 Abbreviate a key sequence for Command-line mode. Same as
464 <ex>:ab<oa>breviate</oa></ex>, but for
465 <t>command-line</t> mode only.
471 <tags>:ia :iabbreviate</tags>
472 <spec>:ia<oa>bbreviate</oa> <a>lhs</a> <a>rhs</a></spec>
473 <spec>:ia<oa>bbreviate</oa> <a>lhs</a></spec>
474 <spec>:ia<oa>bbreviate</oa></spec>
477 Abbreviate a key sequence for Insert mode. Same as
478 <ex>:ab<oa>breviate</oa></ex>, but for insert mode only.
484 <tags>:una :unabbreviate</tags>
485 <spec>:una<oa>bbreviate</oa> <a>lhs</a></spec>
486 <spec>:una<oa>bbreviate</oa>!</spec>
488 <p>Remove an abbreviation. With <oa>!</oa>, remove all abbreviations.</p>
493 <tags>:cuna :cunabbreviate</tags>
494 <spec>:cuna<oa>bbreviate</oa> <a>lhs</a></spec>
495 <spec>:cuna<oa>bbreviate</oa>!</spec>
498 Remove abbreviation(s) for Command-line mode. Same as
499 <ex>:una<oa>bbreviate</oa></ex>, but for
500 <t>command-line</t> mode only.
506 <tags>:iuna :iunabbreviate</tags>
507 <spec>:iuna<oa>bbreviate</oa> <a>lhs</a></spec>
508 <spec>:iuna<oa>bbreviate</oa>!</spec>
511 Remove abbreviation(s) for Insert mode. Same as
512 <ex>:una<oa>bbreviate</oa></ex> but for Insert mode
518 <h2 tag="user-commands">User-defined commands</h2>
521 Defining new commands is perhaps the most straightforward way of
522 repeating commonly used actions. User-defined commands may be
523 entered from the command line or scripts exactly like standard
524 commands, and may similarly accept arguments, options, counts,
525 and <oa>!</oa>s, as well as provide command-line completion.
526 These commands may be defined as either ordinary,
527 macro-interpolated Ex commands, or otherwise as plain
528 JavaScript statements.
532 <tags>:com :command</tags>
533 <spec>:com<oa>mand</oa></spec>
534 <description short="true">
535 <p>List all user-defined commands.</p>
540 <spec>:com<oa>mand</oa> <oa>cmd</oa></spec>
543 List all user-defined commands that start with <oa>cmd</oa>. Commands
544 are partitioned into <t>groups</t>.
550 <spec>:com<oa>mand</oa><oa>!</oa> <oa><a>options</a>…</oa> <a>cmd</a> <a>rep</a></spec>
553 Define a new user command. The name of the command is
554 <a>cmd</a> and its replacement text is <a>rep</a>. If a
555 command with this name already exists, an error is
556 reported unless <oa>!</oa> is specified, in which case
557 the command is redefined. Unlike Vim, the command may
558 start with a lowercase letter. <a>cmd</a> may also be multiple
559 alternative command names separated by commas.
563 The new command is usually defined by a string to be
564 executed as an Ex command. In this case, before
565 execution, strings of the form
566 <hl key="HelpKey"><<a>var</a>></hl> are interpolated
567 as described below, in order to insert arguments,
568 options, and the like. If the <em>-javascript</em> (short
569 name <em>-js</em>) flag is present, the command is
570 executed as JavaScript, and the arguments are present as
571 variables in its scope instead, and no interpolation is
576 The command's behavior can be altered by providing
577 options when the command is defined.
580 <h3 tag=":command-group">Grouping</h3>
583 The <em>-group</em> flag (short name: <em>-g</em>) can be used to
584 assign this command to a specific <t>group</t>.
587 <h3 tag="E175 E176 :command-nargs">Argument handling</h3>
590 By default, user commands accept no arguments. This can be changed by specifying
591 the <tt>-nargs</tt> option.
594 <p>The valid values are:</p>
597 <dt>-nargs=0</dt><dd>No arguments are allowed (default)</dd>
598 <dt>-nargs=1</dt><dd>One argument is allowed</dd>
599 <dt>-nargs=*</dt><dd>Zero or more arguments are allowed</dd>
600 <dt>-nargs=?</dt><dd>Zero or one argument is allowed</dd>
601 <dt>-nargs=+</dt><dd>One or more arguments are allowed</dd>
604 <h3 tag="E180 E181 :command-complete">Argument completion</h3>
607 Completion for arguments to user-defined commands is not available by default.
608 Completion can be enabled by specifying one of the following arguments to the
609 -complete option when defining the command.
612 <dl tag=":command-complete-arg-list"/>
614 <h3 tag="E467 E468 :command-completion-custom">Custom completion</h3>
617 Custom completion can be provided by specifying the
618 <str>custom,<a>thing</a></str> argument to <tt>-complete</tt>. If
619 <a>thing</a> evaluates to a function (i.e., it is a variable holding
620 a function value, or a string containing the definition itself), it
621 is called with two arguments: a completion context, and an object
622 describing the command's arguments. It should set the context's
623 <tt>completions</tt> property to the list of completion results.
624 Other influential properties include <tt>title</tt>, <tt>sort</tt>,
625 <tt>anchored</tt>, and <tt>filters</tt>, which are documented in the
626 <link topic="resource://dactyl/completion.jsm"
627 line="17" dactyl:command="buffer.viewSource">source code</link>.
631 <em>completions</em> is a two-dimensional array of the form:
632 <tt>[[arg1, description1], [arg2, description2], …]</tt>
636 Otherwise <a>thing</a> should evaluate to an array of the same form
637 as the <tt>completions</tt> property of the context object.
642 <code><ex>:command foo -nargs=? -complete custom,<str delim="'">
643 \ function (context) context.completions = [["arg1", "description1"], ["arg2", "description2"]]</str>
644 \ <ex>:echo</ex> <str>Useless </str> + <em><q-args></em></ex>
646 <ex>:command foo -nargs=?
647 \ -complete custom,<str delim="'">[["arg1", "description1"], ["arg2, "description2"]]</str>
648 \ <ex>:echo</ex> <str>Same as above but simpler </str> + <em><q-args></em></ex></code>
651 <h3 tag="E177 E178 :command-count">Count handling</h3>
654 By default, user commands do not accept a count. Use the -count option if
655 you'd like to have a count passed to your user command. This will then be
656 available for expansion as <count> in the replacement.
659 <h3 tag=":command-bang">Special cases</h3>
662 By default, a user command does not have a special version, i.e. a version
663 executed with the ! modifier. Providing the -bang option will enable this
664 and <bang> will be available in the replacement.
667 <h3 tag=":command-description">Command description</h3>
670 The command's description text can be set with -description. Otherwise it will
671 default to "User-defined command".
674 <h3 tag=":command-replacement-text">Replacement text</h3>
677 The replacement text <a>rep</a> is scanned for <t>macro-string</t>s and these are
678 replaced with values from the user-entered command line. The resulting string
679 is then executed as an Ex command.
683 In addition to the standard parameters listed in
684 <t>macro-string</t>, the following parameters are available:
688 <dt><args></dt> <dd>The command arguments exactly as supplied</dd>
689 <dt><count></dt><dd>Any supplied count, e.g. 5</dd>
690 <dt><bang></dt> <dd>! if the command was executed with the ! modifier</dd>
696 <tags>:delc :delcommand</tags>
697 <spec>:delc<oa>ommand</oa> <a>cmd</a></spec>
698 <spec>:delc<oa>ommand</oa>!</spec>
700 <p>Delete the user-defined command <a>cmd</a>. With <oa>!</oa>, delete
701 all user commands.</p>
705 <h2 tag="command-examples">Examples</h2>
707 <p>Add a :Google command to search via google:</p>
708 <code><ex>:command -nargs=* Google open google <args></ex></code>
710 <!-- TODO: add decent examples -->
714 <!-- vim:se sts=4 sw=4 et: -->