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<hgroup>
<h1>Custom Output Formats</h1>
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<section id="body-text" class="hyphenate">
<nav><a href="/glyph/book/extending/task.html">Defining Custom Tasks ←</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/command.html">→ Defining Custom Commands</a></nav>
<p>As shown in <a href="/glyph/book/extending/commands_tasks.html#cmd_tasks_arch">How Commands and Tasks work</a>, the <a href="/glyph/book/ref_commands.html#c_compile"><code>compile</code></a> command command calls specific tasks defined in the <code>generate:</code> Rake namespace to generate output files in a particular format.</p>
<p>More specifically, when a <code>--format</code> option is specified, the command looks for a task with the same name within the <code>generate:</code> namespace. This makes adding new output formats to Glyph a fairly easy task, without the need to specify custom commands or similar.</p>
<p>The following sections explain how the <code>h3rald</code> output format was created to integrate this book into the <a href="http://www.h3rald.com">H3RALD.com</a> website.</p>
<section class="section">
<header><h1 id="h_93">Output Configuration</h1></header>
<p>The first step required to add a new output format to Glyph is extending Glyph’s configuration by adding the appropriate output hash, as follows:</p>
<div class="CodeRay">
<div class="code"><pre><span class="no"> 1</span> <span class="sy">:output</span>:
<span class="no"> 2</span> <span class="sy">:h3rald</span>:
<span class="no"> 3</span> <span class="sy">:multifile</span>: <span class="er">true</span>
<span class="no"> 4</span> <span class="sy">:extension</span>: <span class="er">'.html'</span>
<span class="no"> 5</span> <span class="sy">:filter_target</span>: <span class="er">'html'</span>
<span class="no"> 6</span> <span class="sy">:base</span>: <span class="er">'/glyph/book/'</span>
<span class="no"> 7</span> <span class="sy">:macro_dirs</span>: [<span class="er">'html', 'html5']</span>
<span class="no"> 8</span> <span class="sy">:layout_dirs</span>: [<span class="er">'web5']</span>
<span class="no"> 9</span> <span class="sy">:layouts</span>:
<span class="no"><strong>10</strong></span> <span class="sy">:topic</span>: <span class="er">bookpage</span>
<span class="no">11</span> <span class="sy">:index</span>: <span class="er">bookindex</span></pre></div>
</div>
<p>In particular, the following keys are mandatory:</p>
<ul>
<li>multifile</li>
<li>extension</li>
<li>filter_target</li>
<li>base</li>
<li>macro_dirs</li>
<li>layout_dirs</li>
</ul>
</section>
<section class="section">
<header><h1 id="h_94">Creating a 'generate:h3rald' task</h1></header>
<p>The next (and final) step involves creating a custom <code>h3rald</code> task within the <code>generate:</code> namespace. This task can be placed in any <code>.rake</code> file within the <code>lib/tasks</code> directory:</p>
<div class="CodeRay">
<div class="code"><pre><span class="no"> 1</span> namespace <span class="sy">:generate</span> <span class="r">do</span>
<span class="no"> 2</span> desc <span class="s"><span class="dl">"</span><span class="k">Create output for h3rald.com integration</span><span class="dl">"</span></span>
<span class="no"> 3</span> task <span class="sy">:h3rald</span> => [<span class="sy">:web5</span>] <span class="r">do</span>
<span class="no"> 4</span> dir = <span class="co">Glyph</span>::<span class="co">PROJECT</span>/<span class="s"><span class="dl">'</span><span class="k">output/h3rald</span><span class="dl">'</span></span>
<span class="no"> 5</span> (dir/<span class="s"><span class="dl">"</span><span class="k">glyph/book</span><span class="dl">"</span></span>).mkpath
<span class="no"> 6</span> <span class="c"># Copy files in subdir</span>
<span class="no"> 7</span> (dir).find <span class="r">do</span> |i|
<span class="no"> 8</span> <span class="r">if</span> i.file? <span class="r">then</span>
<span class="no"> 9</span> <span class="r">next</span> <span class="r">if</span>
<span class="no"><strong>10</strong></span> i.to_s.match(<span class="co">Regexp</span>.escape(dir/<span class="s"><span class="dl">'</span><span class="k">glyph</span><span class="dl">'</span></span>)) ||
<span class="no">11</span> i.to_s.match(<span class="co">Regexp</span>.escape(dir/<span class="s"><span class="dl">'</span><span class="k">images</span><span class="dl">'</span></span>)) ||
<span class="no">12</span> i.to_s.match(<span class="co">Regexp</span>.escape(dir/<span class="s"><span class="dl">'</span><span class="k">styles</span><span class="dl">'</span></span>))
<span class="no">13</span> dest = dir/<span class="s"><span class="dl">"</span><span class="k">glyph/book/</span><span class="il"><span class="idl">#{</span>i.relative_path_from(<span class="co">Glyph</span>::<span class="co">PROJECT</span>/dir)<span class="idl">}</span></span><span class="dl">"</span></span>
<span class="no">14</span> src = i.to_s
<span class="no">15</span> <span class="co">Pathname</span>.new(dest).parent.mkpath
<span class="no">16</span> file_copy src, dest
<span class="no">17</span> <span class="r">end</span>
<span class="no">18</span> <span class="r">end</span>
<span class="no">19</span> <span class="c"># Remove files</span>
<span class="no"><strong>20</strong></span> dir.children.each <span class="r">do</span> |c|
<span class="no">21</span> <span class="r">unless</span> [dir/<span class="s"><span class="dl">'</span><span class="k">glyph</span><span class="dl">'</span></span>, dir/<span class="s"><span class="dl">'</span><span class="k">images</span><span class="dl">'</span></span>, dir/<span class="s"><span class="dl">'</span><span class="k">styles</span><span class="dl">'</span></span>].include? c <span class="r">then</span>
<span class="no">22</span> c.directory? ? c.rmtree : c.unlink
<span class="no">23</span> <span class="r">end</span>
<span class="no">24</span> <span class="r">end</span>
<span class="no">25</span> (dir/<span class="s"><span class="dl">'</span><span class="k">images/glyph/glyph.eps</span><span class="dl">'</span></span>).unlink
<span class="no">26</span> (dir/<span class="s"><span class="dl">'</span><span class="k">images/glyph/glyph.svg</span><span class="dl">'</span></span>).unlink
<span class="no">27</span> <span class="c"># Create project page</span>
<span class="no">28</span> project = <span class="co">Glyph</span>.filter <span class="s"><span class="dl">%{</span><span class="k">layout:project[
<span class="no">29</span> @contents[</span><span class="il"><span class="idl">#{</span>file_load(<span class="co">Glyph</span>::<span class="co">PROJECT</span>/<span class="s"><span class="dl">'</span><span class="k">text/introduction.glyph</span><span class="dl">'</span></span>)<span class="idl">}</span></span><span class="k">]
<span class="no"><strong>30</strong></span> ]</span><span class="dl">}</span></span>
<span class="no">31</span> file_write dir/<span class="s"><span class="dl">"</span><span class="k">glyph.textile</span><span class="dl">"</span></span>, project
<span class="no">32</span> <span class="r">end</span>
<span class="no">33</span> <span class="r">end</span></pre></div>
</div>
<p>In this case, this task does not actually renders files in a different format, it just moves the files generated by the @generate:web5@ task in different subdirectories.</p>
<p>Additionally, it also generates the <a href="http://www.h3rald.com/glyph/">Glyph project page</a> from the book's introduction (note the usage of a raw custom layout macro).</p>
</section>
<nav><a href="/glyph/book/extending/task.html">Defining Custom Tasks ←</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/command.html">→ Defining Custom Commands</a></nav>
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