contents/glyph/book/extending/task.html
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title: "Glyph – Defining Custom Tasks"
content-type: page
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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" class="toc">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="line-numbers"> <a href="#n1" name="n1">1</a></span>namespace <span class="symbol">:custom</span> <span class="keyword">do</span>
<span class="line-numbers"> <a href="#n2" name="n2">2</a></span> task <span class="symbol">:generate</span>, [<span class="symbol">:file</span>] <span class="keyword">do</span> |t, args|
<span class="line-numbers"> <a href="#n3" name="n3">3</a></span> generate = lambda <span class="keyword">do</span> |source, destination|
<span class="line-numbers"> <a href="#n4" name="n4">4</a></span> <span class="constant">Glyph</span>.info <span class="string"><span class="delimiter">"</span><span class="content">Generating </span><span class="inline"><span class="inline-delimiter">#{</span>destination<span class="inline-delimiter">}</span></span><span class="content">...</span><span class="delimiter">"</span></span>
<span class="line-numbers"> <a href="#n5" name="n5">5</a></span> <span class="constant">Glyph</span>.compile <span class="constant">Glyph</span>::<span class="constant">PROJECT</span>/<span class="string"><span class="delimiter">"</span><span class="content">text/</span><span class="inline"><span class="inline-delimiter">#{</span>source<span class="inline-delimiter">}</span></span><span class="content">.glyph</span><span class="delimiter">"</span></span>,
<span class="line-numbers"> <a href="#n6" name="n6">6</a></span> <span class="constant">Glyph</span>::<span class="constant">PROJECT</span>/<span class="string"><span class="delimiter">"</span><span class="content">../</span><span class="inline"><span class="inline-delimiter">#{</span>destination<span class="inline-delimiter">}</span></span><span class="content">.textile</span><span class="delimiter">"</span></span>
<span class="line-numbers"> <a href="#n7" name="n7">7</a></span> <span class="keyword">end</span>
<span class="line-numbers"> <a href="#n8" name="n8">8</a></span> files = {
<span class="line-numbers"> <a href="#n9" name="n9">9</a></span> <span class="symbol">:AUTHORS</span> => <span class="symbol">:acknowledgements</span>,
<span class="line-numbers"><strong><a href="#n10" name="n10">10</a></strong></span> <span class="symbol">:CHANGELOG</span> => <span class="symbol">:changelog</span>,
<span class="line-numbers"><a href="#n11" name="n11">11</a></span> <span class="symbol">:LICENSE</span> => <span class="symbol">:license</span>,
<span class="line-numbers"><a href="#n12" name="n12">12</a></span> <span class="symbol">:README</span> => <span class="symbol">:introduction</span>
<span class="line-numbers"><a href="#n13" name="n13">13</a></span> }
<span class="line-numbers"><a href="#n14" name="n14">14</a></span> arg = args[<span class="symbol">:file</span>].upcase.to_sym
<span class="line-numbers"><a href="#n15" name="n15">15</a></span> raise <span class="constant">RuntimeError</span>, <span class="string"><span class="delimiter">"</span><span class="content">Unknown file '</span><span class="inline"><span class="inline-delimiter">#{</span>arg<span class="inline-delimiter">}</span></span><span class="content">.glyph'</span><span class="delimiter">"</span></span>
<span class="line-numbers"><a href="#n16" name="n16">16</a></span> <span class="keyword">unless</span> files.keys.include? arg
<span class="line-numbers"><a href="#n17" name="n17">17</a></span> generate.call files[arg], arg
<span class="line-numbers"><a href="#n18" name="n18">18</a></span> <span class="constant">Glyph</span>.info <span class="string"><span class="delimiter">"</span><span class="content">Done.</span><span class="delimiter">"</span></span>
<span class="line-numbers"><a href="#n19" name="n19">19</a></span> <span class="keyword">end</span>
<span class="line-numbers"><strong><a href="#n20" name="n20">20</a></strong></span><span class="keyword">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>
</section>
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