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content/glyph/book/text_editing/code.html

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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">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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						<h2>Source Code</h2>
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							<div class="navigation"><a href="/glyph/book/text_editing/images.html">Images and Figures &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/text_editing/raw_html.html">&rarr; Textile or Markdown</a></div>
								<p>If you&#8217;re a programmer, chances are that you&#8217;re going to include some source code in your articles and books. Glyph offers two ways to format code blocks effortlessly: the <a href="/glyph/book/macros/macros_block.html#m_codeblock"><code>codeblock</code></a> macro, which simply wraps text into <code>&lt;pre&gt;</code> and <code>&lt;code&gt;</code> tags, or the <a href="/glyph/book/macros/macros_filters.html#m_highlight"><code>highlight</code></a> macro. The last one requires either <a href="http://coderay.rubychan.de/">Coderay</a> or <a href="http://ultraviolet.rubyforge.org/">Ultraviolet</a>, but it provides syntax highlighting for the most common programming languages.</p>
<p>Cosider the following piece of ruby code:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> def find_child(&amp;block)
<span class="line-numbers">   2 </span>   children.each do |c|
<span class="line-numbers">   3 </span>     c.descend do |node, level|
<span class="line-numbers">   4 </span>       return node if block.call(node)
<span class="line-numbers">   5 </span>     end
<span class="line-numbers">   6 </span>   end
<span class="line-numbers">   7 </span>   nil
<span class="line-numbers">   8 </span> end
</pre>
	<p>It can be wrapped in a highlight macro, like so:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> highlight[=ruby|
<span class="line-numbers">   2 </span>   def find_child(&amp;block)
<span class="line-numbers">   3 </span>     children.each do |c|
<span class="line-numbers">   4 </span>       c.descend do |node, level|
<span class="line-numbers">   5 </span>         return node if block.call(node)
<span class="line-numbers">   6 </span>       end
<span class="line-numbers">   7 </span>     end
<span class="line-numbers">   8 </span>     nil
<span class="line-numbers">   9 </span>   end
<span class="line-numbers">  10 </span> =]
</pre>
	<p>...to produce the following, using the ultraviolet highlighter:</p>
	<pre class="lazy"><span class="line-numbers">   1 </span> <span class="Keyword">def</span> <span class="Entity">find_child</span>(<span class="Variable"><span class="Keyword">&amp;</span>block</span>)
<span class="line-numbers">   2 </span>   children.<span class="Entity">each</span> <span class="Keyword">do </span>|<span class="Variable">c</span>|
<span class="line-numbers">   3 </span>     c.<span class="Entity">descend</span> <span class="Keyword">do </span>|<span class="Variable">node</span>, <span class="Variable">level</span>|
<span class="line-numbers">   4 </span>       <span class="Keyword">return</span> node <span class="Keyword">if</span> block.<span class="Entity">call</span>(node)
<span class="line-numbers">   5 </span>     <span class="Keyword">end</span>
<span class="line-numbers">   6 </span>   <span class="Keyword">end</span>
<span class="line-numbers">   7 </span>   <span class="Constant">nil</span>
<span class="line-numbers">   8 </span> <span class="Keyword">end</span>
</pre>
	<div class="box">
<div class="box-title">Some Remarks</div>
<ul>
	<li>Highlighters require some configuration. For more information on relevant configuration settings, see the <a href="/glyph/book/config/filters.html#cfg_filters">filters.*</a> configuration settings.</li>
	<li>If you&#8217;re using the <a href="/glyph/book/macros/macros_filters.html#m_highlight"><code>highlight</code></a> macro together within the <a href="/glyph/book/macros/macros_filters.html#m_textile"><code>textile</code></a> macro, you must wrap the macro call within <code>&lt;notextile&gt;</code> tags.</li>
	<li>You must always escape pipes (<code>|</code>) with the code or the highlight macro.</li>
</ul>

</div>
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