content/glyph/book/extending/commands_tasks.html
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<h1>Defining Custom Commands and Tasks</h1>
<h2>Glyph</h2>
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<nav class="navigation"><a href="/glyph/book/extending/further_reading.html">Further Reading</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/extending/task.html">Defining Custom Tasks</a></nav>
<p>In most cases, you can extend Glyph just by creating your own <a href="/glyph/book/extending/macro_def.html#macro_def">custom macros</a>. In some cases though, you may want to further customize Glyph to fit the needs of your project, in terms of creating <a href="/glyph/book/extending/command.html#custom_command">custom commands</a> and <a href="/glyph/book/extending/task.html#custom_task">custom tasks</a>.</p>
<p>Glyph’s modular architecture (and the Ruby language itself) lets you to add <em>arbitrary</em> functionality to its core, simply by creating a few Ruby files and putting them in the right places.</p>
<section class="section">
<header><h1 id="cmd_tasks_arch">How Commands and Tasks work</h1></header>
<p>Before creating custom Glyph commands and tasks, you should have a basic understanding on how they work, and which commands — or better, which tasks — are already available.</p>
<p>The following diagram outlines the relationships between the default commands and some tasks:</p>
<figure><img src="/glyph/book/images/glyph/commands_tasks.png" /><figcaption>Some of Glyph default commands and tasks</figcaption></figure>
<p>As you can see:</p>
<ul>
<li>All commands call at at least one task.</li>
<li>There are several task inter-dependencies spanning across three main Rake namespaces:
<ul>
<li><code>project:</code> — used for tasks affecting only the physical structure of the Glyph project.</li>
<li><code>load:</code> — used to load all kinds of files.</li>
<li><code>generate:</code> — used to generate files or copy files from source to output directories</li>
</ul></li>
</ul>
<aside class="box">
<div class="box-title">Example</div>
<p>Suppose you want to generate a <span class="caps">PDF</span> file by issuing the <code>glyph compile -f pdf</code> command. Under the hood, Glyph calls the following tasks:</p>
<ol>
<li><code>load:config</code> — Load the configuration files</li>
<li><code>load:tasks</code> — Load custom tasks (if any)</li>
<li><code>load:commands</code> — Load custom commands (if any)</li>
<li><code>load:snippets</code> — Load snippets from the <code>snippet.yml</code> file</li>
<li><code>load:macros</code> — Load macros</li>
<li><code>load:all</code> — Dummy task used to call the previous ones</li>
<li><code>generate:document</code> — Parse, analyze and finalize the Glyph document</li>
<li><code>generate:images</code> — Copy images to the output directory (if any)</li>
<li><code>generate:styles</code> — Copy stylesheets to the output directory (if necessary)</li>
<li><code>generate:html</code> — Generate a standalone <span class="caps">HTML</span> file</li>
<li><code>generate:pdf</code> — Generate a <span class="caps">PDF</span> file from a standalone <span class="caps">HTML</span> file</li>
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