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641 lines
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HTML
641 lines
21 KiB
HTML
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@licstart The following is the entire license notice for the
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Copyright (C) 2012-2013 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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</script>
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</head>
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<body>
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<div id="preamble" class="status">
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<nav>
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<ul class="center">
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<li> <a href="index.html">Overview</a>
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<li> <a href="https://github.com/capitaomorte/yasnippet/blob/master/README.mdown">
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Intro and Tutorial</a>
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<li class="center">Snippet
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<ul>
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<li> <a href="snippet-organization.html">Organization</a>
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<li> <a href="snippet-expansion.html">Expansion</a>
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<li> <a href="snippet-development.html">Development</a>
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<li> <a href="snippet-menu.html">Menu</a>
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</ul>
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<li> <a href="faq.html">FAQ</a>
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<li> <a href="snippet-reference.html">Reference</a>
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</ul>
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</nav>
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</div>
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<div id="content">
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<h1 class="title">Expanding snippets</h1>
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<div id="table-of-contents">
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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<li><a href="#sec-1">Triggering expansion</a>
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<ul>
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<li><a href="#sec-1-1">Trigger key</a>
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<ul>
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<li><a href="#sec-1-1-1">Fallback behaviour</a></li>
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</ul>
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</li>
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<li><a href="#sec-1-2">Insert at point</a></li>
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<li><a href="#sec-1-3">Snippet keybinding</a></li>
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<li><a href="#sec-1-4">Expanding from the menu</a></li>
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<li><a href="#sec-1-5">Expanding with <code>hippie-expand</code></a></li>
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<li><a href="#sec-1-6">Expanding from emacs-lisp code</a></li>
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</ul>
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</li>
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<li><a href="#sec-2">Controlling expansion</a>
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<ul>
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<li><a href="#sec-2-1">Eligible snippets</a></li>
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<li><a href="#sec-2-2">The condition system</a></li>
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<li><a href="#sec-2-3">Multiples snippet with the same key</a>
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<ul>
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<li><a href="#sec-2-3-1">Use the X window system</a></li>
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<li><a href="#sec-2-3-2">Minibuffer prompting</a></li>
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<li><a href="#sec-2-3-3">Use <code>dropdown-menu.el</code></a></li>
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<li><a href="#sec-2-3-4">Roll your own</a></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<p>
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This section describes how YASnippet chooses snippets for expansion at point.
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</p>
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<p>
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Maybe, you'll want some snippets to be expanded in a particular
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mode, or only under certain conditions, or be prompted using
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</p>
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<div id="outline-container-sec-1" class="outline-2">
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<h2 id="sec-1">Triggering expansion</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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You can use YASnippet to expand snippets in different ways:
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</p>
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<ul class="org-ul">
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<li>When <a href="snippet-reference.html#yas-minor-mode"><code>yas-minor-mode</code></a> is active:
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<ul class="org-ul">
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<li>Type the snippet's <b>trigger key</b> then calling <a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a>
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(bound to <code>TAB</code> by default).
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</li>
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<li>Use the snippet's <b>keybinding</b>.
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</li>
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<li>By expanding directly from the "YASnippet" menu in the menu-bar
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</li>
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<li>Using hippie-expand
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</li>
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</ul>
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</li>
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<li>Call <a href="snippet-reference.html#yas-insert-snippet"><code>yas-insert-snippet</code></a> (use <code>M-x yas-insert-snippet=</code> or its
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keybinding <code>C-c & C-s</code>).
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</li>
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<li>Use m2m's excellent auto-complete
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TODO: example for this
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</li>
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<li>Expanding from emacs-lisp code
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</li>
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</ul>
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</div>
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<div id="outline-container-sec-1-1" class="outline-3">
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<h3 id="sec-1-1">Trigger key</h3>
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<div class="outline-text-3" id="text-1-1">
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<p>
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<a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a> tries to expand a <i>snippet abbrev</i> (also known as
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<i>snippet key</i>) before point.
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</p>
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<p>
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When <a href="snippet-reference.html#yas-minor-mode"><code>yas-minor-mode</code></a> is enabled, it binds <a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a> to <code>TAB</code> and
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<code><tab></code> by default, however, you can freely set it to some other key:
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</p>
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<div class="org-src-container">
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<pre class="src src-emacs-lisp">(define-key yas-minor-mode-map (kbd "<tab>") nil)
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(define-key yas-minor-mode-map (kbd "TAB") nil)
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(define-key yas-minor-mode-map (kbd "<the new key>") 'yas-expand)
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</pre>
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</div>
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<p>
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To enable the YASnippet minor mode in all buffers globally use the
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command <a href="snippet-reference.html#yas-global-mode"><code>yas-global-mode</code></a>. This will enable a modeline indicator,
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<code>yas</code>:
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</p>
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<div class="figure">
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<p><img src="./images/minor-mode-indicator.png" alt="minor-mode-indicator.png" />
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</p>
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</div>
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<p>
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When you use <a href="snippet-reference.html#yas-global-mode"><code>yas-global-mode</code></a> you can also selectively disable
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YASnippet in some buffers by setting the buffer-local variable
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<a href="snippet-reference.html#yas-dont-active"><code>yas-dont-active</code></a> in the buffer's mode hook.
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</p>
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</div>
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<div id="outline-container-sec-1-1-1" class="outline-4">
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<h4 id="sec-1-1-1">Fallback behaviour</h4>
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<div class="outline-text-4" id="text-1-1-1">
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<p>
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<a href="snippet-reference.html#yas-fallback-behaviour"><code>yas-fallback-behaviour</code></a> is a customization variable bound to
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'<code>call-other-command</code> by default. If <a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a> failed to find any
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suitable snippet to expand, it will disable the minor mode temporarily
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and find if there's any other command bound to the same key.
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</p>
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<p>
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If found, the command will be called. Usually this works very well
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–when there's a snippet, expand it, otherwise, call whatever command
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originally bind to the trigger key.
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</p>
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<p>
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However, you can change this behavior by customizing the
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<a href="snippet-reference.html#yas-fallback-behavior"><code>yas-fallback-behavior</code></a> variable. If you set this variable to
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'<code>return-nil</code>, it will return <code>nil</code> instead of trying to call the
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<i>original</i> command when no snippet is found.
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</p>
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</div>
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</div>
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</div>
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<div id="outline-container-sec-1-2" class="outline-3">
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<h3 id="sec-1-2">Insert at point</h3>
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<div class="outline-text-3" id="text-1-2">
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<p>
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The command <i><code>yas-insert-snippet</code></i> lets you insert snippets at point
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<i>for your current major mode</i>. It prompts you for the snippet key
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first, and then for a snippet template if more than one template
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exists for the same key.
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</p>
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<p>
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The list presented contains the snippets that can be inserted at point,
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according to the condition system. If you want to see all applicable
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snippets for the major mode, prefix this command with <code>C-u</code>.
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</p>
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<p>
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The prompting methods used are again controlled by
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<a href="snippet-reference.html#yas-prompt-functions"><code>yas-prompt-functions</code></a>.
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</p>
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</div>
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</div>
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<div id="outline-container-sec-1-3" class="outline-3">
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<h3 id="sec-1-3">Snippet keybinding</h3>
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<div class="outline-text-3" id="text-1-3">
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<p>
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See the section of the <code># binding:</code> directive in
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<a href="./snippet-development.html">Writing Snippets</a>.
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</p>
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</div>
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</div>
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<div id="outline-container-sec-1-4" class="outline-3">
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<h3 id="sec-1-4">Expanding from the menu</h3>
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<div class="outline-text-3" id="text-1-4">
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<p>
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See <a href="./snippet-menu.html">the YASnippet Menu</a>.
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</p>
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</div>
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</div>
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<div id="outline-container-sec-1-5" class="outline-3">
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<h3 id="sec-1-5">Expanding with <code>hippie-expand</code></h3>
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<div class="outline-text-3" id="text-1-5">
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<p>
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To integrate with <code>hippie-expand</code>, just put
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<a href="snippet-reference.html#yas-hippie-try-expand"><code>yas-hippie-try-expand</code></a> in
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<code>hippie-expand-try-functions-list</code>. This probably makes more sense
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when placed at the top of the list, but it can be put anywhere you
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prefer.
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</p>
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</div>
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</div>
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<div id="outline-container-sec-1-6" class="outline-3">
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<h3 id="sec-1-6">Expanding from emacs-lisp code</h3>
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<div class="outline-text-3" id="text-1-6">
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<p>
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Sometimes you might want to expand a snippet directly from your own
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elisp code. You should call <a href="snippet-reference.html#yas-expand-snippet"><code>yas-expand-snippet</code></a> instead of
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<a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a> in this case. <a href="snippet-reference.html#yas-expand-snippet"><code>yas-expand-snippet</code></a> takes a string in
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snippet template syntax, if you want to expand an existing snippet you
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can use <a href="snippet-reference.html#yas-lookup-snippet"><code>yas-lookup-snippet</code></a> to find its contents by name.
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</p>
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<p>
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As with expanding from the menubar, the condition system and multiple
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candidates doesn't affect expansion (the condition system does affect
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<a href="snippet-reference.html#yas-lookup-snippet"><code>yas-lookup-snippet</code></a> though). In fact, expanding from the YASnippet
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menu has the same effect of evaluating the follow code:
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</p>
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<div class="org-src-container">
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<pre class="src src-emacs-lisp">(yas-expand-snippet template)
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</pre>
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</div>
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<p>
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See the internal documentation on <a href="snippet-reference.html#yas-expand-snippet"><code>yas-expand-snippet</code></a> and
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<a href="snippet-reference.html#yas-lookup-snippet"><code>yas-lookup-snippet</code></a> for more information.
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</p>
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</div>
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</div>
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</div>
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<div id="outline-container-sec-2" class="outline-2">
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<h2 id="sec-2">Controlling expansion</h2>
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<div class="outline-text-2" id="text-2">
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</div><div id="outline-container-sec-2-1" class="outline-3">
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<h3 id="sec-2-1">Eligible snippets</h3>
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<div class="outline-text-3" id="text-2-1">
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<p>
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YASnippet does quite a bit of filtering to find out which snippets are
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eligible for expanding at the current cursor position.
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</p>
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<p>
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In particular, the following things matter:
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</p>
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<ul class="org-ul">
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<li>Currently loaded snippets tables
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<p>
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These are loaded from a directory hierarchy in your file system. See
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<a href="./snippet-organization.html">Organizing Snippets</a>. They are named
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after major modes like <code>html-mode</code>, <code>ruby-mode</code>, etc…
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</p>
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</li>
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<li>Major mode of the current buffer
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<p>
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If the currrent major mode matches one of the loaded snippet tables,
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then all that table's snippets are considered for expansion. Use
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<code>M-x describe-variable RET major-mode RET</code> to find out which major
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mode you are in currently.
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</p>
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</li>
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<li>Parent tables
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<p>
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Snippet tables defined as the parent of some other eligible table are
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also considered. This works recursively, i.e. parents of parents of
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eligible tables are also considered.
|
|
</p>
|
|
</li>
|
|
|
|
<li>Buffer-local list of extra modes
|
|
|
|
<p>
|
|
Use <i><code>yas-activate-extra-mode</code></i> to
|
|
consider snippet tables whose name does not correspond to a major
|
|
mode. Typically, you call this from a minor mode hook, for example:
|
|
</p>
|
|
</li>
|
|
</ul>
|
|
|
|
<div class="org-src-container">
|
|
|
|
<pre class="src src-emacs-lisp">;; When entering rinari-minor-mode, consider also the snippets in the
|
|
;; snippet table "rails-mode"
|
|
(add-hook 'rinari-minor-mode-hook
|
|
#'(lambda ()
|
|
(yas-activate-extra-mode 'rails-mode)))
|
|
</pre>
|
|
</div>
|
|
|
|
<ul class="org-ul">
|
|
<li>Buffer-local
|
|
<a href="snippet-reference.html#yas-buffer-local-condition"><code>yas-buffer-local-condition</code></a>
|
|
variable
|
|
|
|
<p>
|
|
This variable provides finer grained control over what snippets can
|
|
be expanded in the current buffer. The default value won't let you
|
|
expand snippets inside comments or string literals for example. See
|
|
The condition system\_ for more info.
|
|
</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-2" class="outline-3">
|
|
<h3 id="sec-2-2">The condition system</h3>
|
|
<div class="outline-text-3" id="text-2-2">
|
|
<p>
|
|
Consider this scenario: you are an old Emacs hacker. You like the
|
|
abbrev-way and bind <a href="snippet-reference.html#yas-expand"><code>yas-expand</code></a> to <code>SPC</code>. However, you don't want
|
|
<code>if</code> to be expanded as a snippet when you are typing in a comment
|
|
block or a string (e.g. in <code>python-mode</code>).
|
|
</p>
|
|
|
|
<p>
|
|
If you use the <code># condition :</code> directive (see
|
|
<a href="./snippet-development.html">Writing Snippets</a>) you could just specify
|
|
the condition for <code>if</code> to be <code>(not (python-in-string/comment))</code>. But how
|
|
about <code>while</code>, <code>for</code>, etc. ? Writing the same condition for all the
|
|
snippets is just boring. So has a buffer local variable
|
|
<a href="snippet-reference.html#yas-buffer-local-condition"><code>yas-buffer-local-condition</code></a>. You can set this variable to
|
|
<code>(not (python-in-string/comment))</code> in <code>python-mode-hook</code>.
|
|
</p>
|
|
|
|
<p>
|
|
Then, what if you really want some particular snippet to expand even
|
|
inside a comment? Set <a href="snippet-reference.html#yas-buffer-local-condition"><code>yas-buffer-local-condition</code></a> like this
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
|
|
<pre class="src src-emacs-lisp">(add-hook 'python-mode-hook
|
|
(lambda ()
|
|
(setq yas-buffer-local-condition
|
|
'(if (python-in-string/comment)
|
|
'(require-snippet-condition . force-in-comment)
|
|
t))))
|
|
</pre>
|
|
</div>
|
|
|
|
<p>
|
|
… and specify the condition for a snippet that you're going to expand
|
|
in comment to be evaluated to the symbol <code>force-in-comment</code>. Then it can
|
|
be expanded as you expected, while other snippets like <code>if</code> still can't
|
|
expanded in comment.
|
|
</p>
|
|
|
|
<p>
|
|
For the full set of possible conditions, see the documentation for
|
|
<a href="snippet-reference.html#yas-buffer-local-condition"><code>yas-buffer-local-condition</code></a>.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-3" class="outline-3">
|
|
<h3 id="sec-2-3">Multiples snippet with the same key</h3>
|
|
<div class="outline-text-3" id="text-2-3">
|
|
<p>
|
|
The rules outlined <i>above</i> can return more than
|
|
one snippet to be expanded at point.
|
|
</p>
|
|
|
|
<p>
|
|
When there are multiple candidates, YASnippet will let you select one.
|
|
The UI for selecting multiple candidate can be customized through
|
|
<a href="snippet-reference.html#yas-prompt-functions"><code>yas-prompt-functions</code></a> , which defines your preferred methods of being
|
|
prompted for snippets.
|
|
</p>
|
|
|
|
<p>
|
|
You can customize it with
|
|
<code>M-x customize-variable RET yas-prompt-functions RET</code>. Alternatively you
|
|
can put in your emacs-file:
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
|
|
<pre class="src src-emacs-lisp">(setq yas-prompt-functions '(yas-x-prompt yas-dropdown-prompt))
|
|
</pre>
|
|
</div>
|
|
|
|
<p>
|
|
Currently there are some alternatives solution with YASnippet.
|
|
</p>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-3-1" class="outline-4">
|
|
<h4 id="sec-2-3-1">Use the X window system</h4>
|
|
<div class="outline-text-4" id="text-2-3-1">
|
|
|
|
<div class="figure">
|
|
<p><img src="./images/x-menu.png" alt="x-menu.png" />
|
|
</p>
|
|
</div>
|
|
|
|
<p>
|
|
The function <a href="snippet-reference.html#yas-x-prompt"><code>yas-x-prompt</code></a> can be used to show a popup menu for you to
|
|
select. This menu will be part of you native window system widget, which
|
|
means:
|
|
</p>
|
|
|
|
<ul class="org-ul">
|
|
<li>It usually looks beautiful. E.g. when you compile Emacs with gtk
|
|
support, this menu will be rendered with your gtk theme.
|
|
</li>
|
|
<li>Your window system may or may not allow to you use <code>C-n</code>, <code>C-p</code> to
|
|
navigate this menu.
|
|
</li>
|
|
<li>This function can't be used when in a terminal.
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-3-2" class="outline-4">
|
|
<h4 id="sec-2-3-2">Minibuffer prompting</h4>
|
|
<div class="outline-text-4" id="text-2-3-2">
|
|
|
|
<div class="figure">
|
|
<p><img src="./images/ido-menu.png" alt="ido-menu.png" />
|
|
</p>
|
|
</div>
|
|
|
|
<p>
|
|
You can use functions <a href="snippet-reference.html#yas-completing-prompt"><code>yas-completing-prompt</code></a> for the classic emacs
|
|
completion method or <a href="snippet-reference.html#yas-ido-prompt"><code>yas-ido-prompt</code></a> for a much nicer looking method.
|
|
The best way is to try it. This works in a terminal.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-3-3" class="outline-4">
|
|
<h4 id="sec-2-3-3">Use <code>dropdown-menu.el</code></h4>
|
|
<div class="outline-text-4" id="text-2-3-3">
|
|
|
|
<div class="figure">
|
|
<p><img src="./images/dropdown-menu.png" alt="dropdown-menu.png" />
|
|
</p>
|
|
</div>
|
|
|
|
<p>
|
|
The function <a href="snippet-reference.html#yas-dropdown-prompt"><code>yas-dropdown-prompt</code></a> can also be placed in the
|
|
<a href="snippet-reference.html#yas-prompt-functions"><code>yas-prompt-functions</code></a> list.
|
|
</p>
|
|
|
|
<p>
|
|
This works in both window system and terminal and is customizable, you
|
|
can use <code>C-n</code>, <code>C-p</code> to navigate, <code>q</code> to quit and even press <code>6</code> as a
|
|
shortcut to select the 6th candidate.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-sec-2-3-4" class="outline-4">
|
|
<h4 id="sec-2-3-4">Roll your own</h4>
|
|
<div class="outline-text-4" id="text-2-3-4">
|
|
<p>
|
|
See the documentation on variable <a href="snippet-reference.html#yas-prompt-functions"><code>yas-prompt-functions</code></a>
|
|
</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="postamble" class="status">
|
|
<hr><p class='creator'>Generated by <a href="http://www.gnu.org/software/emacs/">Emacs</a> 24.4.91.1 (<a href="http://orgmode.org">Org</a> mode 8.2.10) on from 7703a55ac416a131dec45fa6a1e0ec1e31adf760
|
|
</p>
|
|
<p class='xhtml-validation'><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
|
|
</div>
|
|
</body>
|
|
</html>
|