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<?xml version="1.0" encoding="utf-8"?>
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<title>Glyph</title>
<meta name="author" content="Fabio Cevasco" />

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<title>Defining Custom Tasks - Glyph</title>
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						<h2>Defining Custom Tasks</h2>
						<hr />
						<div id="content-body">
							<div class="navigation"><a href="/glyph/book/extending/commands_tasks.html">Defining Custom Commands and Tasks &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/output_format.html">&rarr; 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&#8217;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&#8217;s root folder:</p>
<ul>
	<li><code>book/text/introduction.glyph</code> &rarr; <code>README.textile</code></li>
	<li><code>book/text/changelog.glyph</code> &rarr; <code>CHANGELOG.textile</code></li>
	<li><code>book/text/license.glyph</code> &rarr; <code>LICENSE.textile</code></li>
	<li><code>book/text/acknowledgement.glyph</code> &rarr; <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&#8217;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">&quot;</span>Generating <span class="String"><span class="String">#{</span>destination<span class="String">}</span></span>...<span class="String">&quot;</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">&quot;</span>text/<span class="String"><span class="String">#{</span>source<span class="String">}</span></span>.glyph<span class="String">&quot;</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">&quot;</span>../<span class="String"><span class="String">#{</span>destination<span class="String">}</span></span>.textile<span class="String">&quot;</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> =&gt; <span class="Constant"><span class="Constant">:</span>acknowledgements</span>, 
<span class="line-numbers">  10 </span>       <span class="Constant"><span class="Constant">:</span>CHANGELOG</span> =&gt; <span class="Constant"><span class="Constant">:</span>changelog</span>, 
<span class="line-numbers">  11 </span>       <span class="Constant"><span class="Constant">:</span>LICENSE</span> =&gt; <span class="Constant"><span class="Constant">:</span>license</span>, 
<span class="line-numbers">  12 </span>       <span class="Constant"><span class="Constant">:</span>README</span> =&gt; <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">&quot;</span>Unknown file '<span class="String"><span class="String">#{</span>arg<span class="String">}</span></span>.glyph'<span class="String">&quot;</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">&quot;</span>Done.<span class="String">&quot;</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&#8217;s it. Note that this task is pretty useless without a command that calls it, and it won&#8217;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>

</div>

							<div class="navigation"><a href="/glyph/book/extending/commands_tasks.html">Defining Custom Commands and Tasks &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/output_format.html">&rarr; Custom Output Formats</a></div>
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