docutilsのディレクティブを作ってみた。

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.. code-block:: ruby
   ::filename:: hello.rb

   puts "hello, world!!"

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hello.rb:
<pre class="brush: ruby">
puts "hello, world!!"
</pre>

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class CodeBlockDirective(Directive):
  required_arguments = 0
  optional_arguments = 1
  has_content = True
  option_spec = { 'filename': directives.unchanged }

  def run(self):
    node = []
    filename = self.options.pop('filename', None)
    if filename is not None:
      node.append(nodes.Text("\n%s:" % filename))
    else:
      node.append(nodes.Text("\n"))
    opt = {'classes' : []}
    if len(self.arguments) != 0:
      opt['classes'].append("brush: %s" % self.arguments[0])
    node.append(nodes.literal_block(self.content, "\n".join(self.content), **opt))
    return node