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<h1>Defining Custom Tasks</h1>
<h2>Glyph</h2>
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<nav class="navigation"><a href="/glyph/book/extending/commands_tasks.html">Defining Custom Commands and Tasks</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/extending/output_format.html">Custom Output Formats</a></nav>
<p>Glyph relies on <a href="http://rake.rubyforge.org/">Rake</a> to perform most of its core operations. Typically, Rake tasks are used do define the high level logic that is used by Glyph commands to, for example, compile a project or load configuration files.</p>
<p>Furthermore, Rake provides an easy mechanism to create dependencies among tasks: for example, to make sure that Glyph’s configuration files are loaded before everything else happens.</p>
<section class="section">
<header><h1 id="custom_generate_task">Creating a 'custom:generate' task</h1></header>
<p>A custom task has been defined for the Glyph project used to produce this document. This custom task is used to compile a few of the documents files into standalone files, deployed in Glyph’s root folder:</p>
<ul>
<li><code>book/text/introduction.glyph</code> → <code>README.textile</code></li>
<li><code>book/text/changelog.glyph</code> → <code>CHANGELOG.textile</code></li>
<li><code>book/text/license.glyph</code> → <code>LICENSE.textile</code></li>
<li><code>book/text/acknowledgement.glyph</code> → <code>AUTHORS.textile</code></li>
</ul>
<p>First of all, create a <code>lib/tasks</code> folder in your project directory. Then, create a <code>.rake</code> file within it, e.g. <code>tasks.rake</code>.</p>
<p>Finally, here’s the source of the task:</p>
<div class="CodeRay">
<div class="code"><pre><span class="no"> 1</span> namespace <span class="sy">:custom</span> <span class="r">do</span>
<span class="no"> 2</span> task <span class="sy">:generate</span>, [<span class="sy">:file</span>] <span class="r">do</span> |t, args|
<span class="no"> 3</span> generate = lambda <span class="r">do</span> |source, destination|
<span class="no"> 4</span> <span class="co">Glyph</span>.info <span class="s"><span class="dl">"</span><span class="k">Generating </span><span class="il"><span class="idl">#{</span>destination<span class="idl">}</span></span><span class="k">...</span><span class="dl">"</span></span>
<span class="no"> 5</span> <span class="co">Glyph</span>.compile <span class="co">Glyph</span>::<span class="co">PROJECT</span>/<span class="s"><span class="dl">"</span><span class="k">text/</span><span class="il"><span class="idl">#{</span>source<span class="idl">}</span></span><span class="k">.glyph</span><span class="dl">"</span></span>,
<span class="no"> 6</span> <span class="co">Glyph</span>::<span class="co">PROJECT</span>/<span class="s"><span class="dl">"</span><span class="k">../</span><span class="il"><span class="idl">#{</span>destination<span class="idl">}</span></span><span class="k">.textile</span><span class="dl">"</span></span>
<span class="no"> 7</span> <span class="r">end</span>
<span class="no"> 8</span> files = {
<span class="no"> 9</span> <span class="sy">:AUTHORS</span> => <span class="sy">:acknowledgements</span>,
<span class="no"><strong>10</strong></span> <span class="sy">:CHANGELOG</span> => <span class="sy">:changelog</span>,
<span class="no">11</span> <span class="sy">:LICENSE</span> => <span class="sy">:license</span>,
<span class="no">12</span> <span class="sy">:README</span> => <span class="sy">:introduction</span>
<span class="no">13</span> }
<span class="no">14</span> arg = args[<span class="sy">:file</span>].upcase.to_sym
<span class="no">15</span> raise <span class="co">RuntimeError</span>, <span class="s"><span class="dl">"</span><span class="k">Unknown file '</span><span class="il"><span class="idl">#{</span>arg<span class="idl">}</span></span><span class="k">.glyph'</span><span class="dl">"</span></span>
<span class="no">16</span> <span class="r">unless</span> files.keys.include? arg
<span class="no">17</span> generate.call files[arg], arg
<span class="no">18</span> <span class="co">Glyph</span>.info <span class="s"><span class="dl">"</span><span class="k">Done.</span><span class="dl">"</span></span>
<span class="no">19</span> <span class="r">end</span>
<span class="no"><strong>20</strong></span> <span class="r">end</span></pre></div>
</div>
<p>That’s it. Note that this task is pretty useless without a command that calls it, and it won’t even show up if you run <code>rake -T</code> within your project directory. <span class="fmi">for more information on <mark>creating custom commands</mark>, see <a href="/glyph/book/extending/command.html#custom_command">Defining Custom Commands</a></span>.</p>
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<nav class="navigation"><a href="/glyph/book/extending/commands_tasks.html">Defining Custom Commands and Tasks</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/extending/output_format.html">Custom Output Formats</a></nav>
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