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<h2>Defining Custom Tasks</h2>
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<div 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></div>
<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>
<div class="section">
<h5 id="custom_generate_task">Creating a 'custom:generate' task</h5>
<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>
<pre class="lazy"><span class="line-numbers"> 1 </span> namespace <span class="Constant"><span class="Constant">:</span>custom</span> <span class="Keyword">do</span>
<span class="line-numbers"> 2 </span> task <span class="Constant"><span class="Constant">:</span>generate</span>, [<span class="Constant"><span class="Constant">:</span>file</span>] <span class="Keyword">do </span>|<span class="Variable">t</span>, <span class="Variable">args</span>|
<span class="line-numbers"> 3 </span> generate <span class="Keyword">=</span> lambda <span class="Keyword">do </span>|<span class="Variable">source</span>, <span class="Variable">destination</span>|
<span class="line-numbers"> 4 </span> <span class="Support">Glyph</span>.<span class="Entity">info</span> <span class="String"><span class="String">"</span>Generating <span class="String"><span class="String">#{</span>destination<span class="String">}</span></span>...<span class="String">"</span></span>
<span class="line-numbers"> 5 </span> <span class="Support">Glyph</span>.<span class="Entity">compile</span> <span class="Support">Glyph</span>::<span class="Entity">PROJECT</span><span class="Keyword">/</span><span class="String"><span class="String">"</span>text/<span class="String"><span class="String">#{</span>source<span class="String">}</span></span>.glyph<span class="String">"</span></span>,
<span class="line-numbers"> 6 </span> <span class="Support">Glyph</span>::<span class="Entity">PROJECT</span><span class="Keyword">/</span><span class="String"><span class="String">"</span>../<span class="String"><span class="String">#{</span>destination<span class="String">}</span></span>.textile<span class="String">"</span></span>
<span class="line-numbers"> 7 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 8 </span> files <span class="Keyword">=</span> {
<span class="line-numbers"> 9 </span> <span class="Constant"><span class="Constant">:</span>AUTHORS</span> => <span class="Constant"><span class="Constant">:</span>acknowledgements</span>,
<span class="line-numbers"> 10 </span> <span class="Constant"><span class="Constant">:</span>CHANGELOG</span> => <span class="Constant"><span class="Constant">:</span>changelog</span>,
<span class="line-numbers"> 11 </span> <span class="Constant"><span class="Constant">:</span>LICENSE</span> => <span class="Constant"><span class="Constant">:</span>license</span>,
<span class="line-numbers"> 12 </span> <span class="Constant"><span class="Constant">:</span>README</span> => <span class="Constant"><span class="Constant">:</span>introduction</span>
<span class="line-numbers"> 13 </span> }
<span class="line-numbers"> 14 </span> arg <span class="Keyword">=</span> args[<span class="Constant"><span class="Constant">:</span>file</span>].<span class="Entity">upcase</span>.<span class="Entity">to_sym</span>
<span class="line-numbers"> 15 </span> <span class="Keyword">raise</span> <span class="Variable">RuntimeError</span>, <span class="String"><span class="String">"</span>Unknown file '<span class="String"><span class="String">#{</span>arg<span class="String">}</span></span>.glyph'<span class="String">"</span></span>
<span class="line-numbers"> 16 </span> <span class="Keyword">unless</span> files.<span class="Entity">keys</span>.<span class="Entity">include?</span> arg
<span class="line-numbers"> 17 </span> generate.<span class="Entity">call</span> files[arg], arg
<span class="line-numbers"> 18 </span> <span class="Support">Glyph</span>.<span class="Entity">info</span> <span class="String"><span class="String">"</span>Done.<span class="String">"</span></span>
<span class="line-numbers"> 19 </span> <span class="Keyword">end</span>
<span class="line-numbers"> 20 </span> <span class="Keyword">end</span>
</pre>
<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 creating custom commands, see <a href="/glyph/book/extending/command.html#custom_command">Defining Custom Commands</a></span>.</p>
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<div 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></div>
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