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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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		<title>Glyph - Defining Custom Commands</title>
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						<h2>Defining Custom Commands</h2>
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							<div class="navigation"><a href="/glyph/book/extending/output_format.html">Custom Output Formats &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/troubleshooting/errors_generic.html">&rarr; Generic Errors</a></div>
							<p>Glyph relies on <a href="http://davetron5000.github.com/gli/"><span class="caps">GLI</span></a> for defining commands. This useful library provides a high-level framework for creating command-line interface similar to <a href="http://git-scm.com/">Git</a>, its <span class="caps">DSL</span> takes care of pretty much everything, from managing command line arguments and options to providing an interactive help system.</p>
<div class="section">
<h5 id="h_96">Creating a 'glyph generate' command</h5>
<p>Consider the custom task defined in <a href="/glyph/book/extending/task.html#custom_generate_task">Creating a &#8216;custom:generate&#8217; task</a>. Creating a custom command to call it is fairly straightforward.</p>
<p>First of all, create a <code>lib/commands</code> folder in your project directory. Then, create a <code>.rb</code> file within it, e.g. <code>commands.rake</code>.</p>
<p>Finally, here&#8217;s the source of the command:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> <span class="Variable">GLI</span>.<span class="Entity">desc</span> <span class="String"><span class="String">'</span>Generates a specific file required for Glyph releases<span class="String">'</span></span>
<span class="line-numbers">   2 </span> arg_name <span class="String"><span class="String">&quot;</span>file_name<span class="String">&quot;</span></span>
<span class="line-numbers">   3 </span> command <span class="Constant"><span class="Constant">:</span>generate</span> <span class="Keyword">do </span>|<span class="Variable">c</span>|
<span class="line-numbers">   4 </span>   c.<span class="Entity">action</span> <span class="Keyword">do </span>|<span class="Variable">global_options</span>,<span class="Variable">options</span>,<span class="Variable">args</span>|
<span class="line-numbers">   5 </span>     <span class="Keyword">if</span> args.<span class="Entity">blank?</span> <span class="Keyword">then</span>
<span class="line-numbers">   6 </span>       <span class="Keyword">raise</span> <span class="Variable">RuntimeError</span>, <span class="String"><span class="String">&quot;</span>You must specify a file to generate<span class="String">&quot;</span></span>
<span class="line-numbers">   7 </span>     <span class="Keyword">else</span>
<span class="line-numbers">   8 </span>       <span class="Support">Glyph</span>.<span class="Entity">run</span> <span class="String"><span class="String">'</span>custom:generate<span class="String">'</span></span>, args[<span class="Constant">0</span>]
<span class="line-numbers">   9 </span>     <span class="Keyword">end</span>
<span class="line-numbers">  10 </span>   <span class="Keyword">end</span>
<span class="line-numbers">  11 </span> <span class="Keyword">end</span>
</pre>
	<p>That&#8217;s it. If you try to run <code>glyph help</code> within your project directory, notice that there&#8217;s a new entry for the generate command:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> $ glyph help
<span class="line-numbers">   2 </span> =====================================
<span class="line-numbers">   3 </span> Glyph v.0.4.0
<span class="line-numbers">   4 </span> =====================================
<span class="line-numbers">   5 </span> usage: glyph command [options]
<span class="line-numbers">   6 </span> 
<span class="line-numbers">   7 </span> Options:
<span class="line-numbers">   8 </span>     -d, --debug - Enable debugging
<span class="line-numbers">   9 </span> 
<span class="line-numbers">  10 </span> Commands:
<span class="line-numbers">  11 </span>     add      - Add a new text file to the project
<span class="line-numbers">  12 </span>     compile  - Compile the project
<span class="line-numbers">  13 </span>     config   - Get/set configuration settings
<span class="line-numbers">  14 </span>     generate - Generates a specific file required for Glyph releases
<span class="line-numbers">  15 </span>     help     - Shows list of commands or help for one command
<span class="line-numbers">  16 </span>     init     - Create a new Glyph project
<span class="line-numbers">  17 </span>     outline  - Display the document outline
<span class="line-numbers">  18 </span>     stats    - Display statistics
<span class="line-numbers">  19 </span>     todo     - Display all project TODO items
</pre>
	<p>You can now run the Glyph command as expected:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> $ glyph -d generate changelog
<span class="line-numbers">   2 </span> -- Generating CHANGELOG...
<span class="line-numbers">   3 </span> -- Done.
</pre>

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