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<h1>Source Code</h1>
<h2>Glyph</h2>
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<nav class="navigation"><a href="/glyph/book/text_editing/images.html">← Images and Figures</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/text_editing/raw_html.html">Textile or Markdown →</a></nav>
<p>If you’re a programmer, chances are that you’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><pre></code> and <code><code></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>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"><a href="#n1" name="n1">1</a></span>def find_child(&block)
<span class="line-numbers"><a href="#n2" name="n2">2</a></span> children.each do |c|
<span class="line-numbers"><a href="#n3" name="n3">3</a></span> c.descend do |node, level|
<span class="line-numbers"><a href="#n4" name="n4">4</a></span> return node if block.call(node)
<span class="line-numbers"><a href="#n5" name="n5">5</a></span> end
<span class="line-numbers"><a href="#n6" name="n6">6</a></span> end
<span class="line-numbers"><a href="#n7" name="n7">7</a></span> nil
<span class="line-numbers"><a href="#n8" name="n8">8</a></span>end</pre></div>
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<p>It can be wrapped in a highlight macro, like so:</p>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"> <a href="#n1" name="n1">1</a></span>highlight[=ruby|
<span class="line-numbers"> <a href="#n2" name="n2">2</a></span> def find_child(&block)
<span class="line-numbers"> <a href="#n3" name="n3">3</a></span> children.each do |c|
<span class="line-numbers"> <a href="#n4" name="n4">4</a></span> c.descend do |node, level|
<span class="line-numbers"> <a href="#n5" name="n5">5</a></span> return node if block.call(node)
<span class="line-numbers"> <a href="#n6" name="n6">6</a></span> end
<span class="line-numbers"> <a href="#n7" name="n7">7</a></span> end
<span class="line-numbers"> <a href="#n8" name="n8">8</a></span> nil
<span class="line-numbers"> <a href="#n9" name="n9">9</a></span> end
<span class="line-numbers"><strong><a href="#n10" name="n10">10</a></strong></span>=]</pre></div>
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<p>...to produce the following, using the coderay highlighter:</p>
<div class="CodeRay">
<div class="code"><pre><span class="line-numbers"><a href="#n1" name="n1">1</a></span><span class="keyword">def</span> <span class="function">find_child</span>(&block)
<span class="line-numbers"><a href="#n2" name="n2">2</a></span> children.each <span class="keyword">do</span> |c|
<span class="line-numbers"><a href="#n3" name="n3">3</a></span> c.descend <span class="keyword">do</span> |node, level|
<span class="line-numbers"><a href="#n4" name="n4">4</a></span> <span class="keyword">return</span> node <span class="keyword">if</span> block.call(node)
<span class="line-numbers"><a href="#n5" name="n5">5</a></span> <span class="keyword">end</span>
<span class="line-numbers"><a href="#n6" name="n6">6</a></span> <span class="keyword">end</span>
<span class="line-numbers"><a href="#n7" name="n7">7</a></span> <span class="predefined-constant">nil</span>
<span class="line-numbers"><a href="#n8" name="n8">8</a></span><span class="keyword">end</span></pre></div>
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<aside 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’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><notextile></code> tags.</li>
<li>You must always escape pipes (<code>|</code>) with the code or the highlight macro.</li>
</ul>
</aside>
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