[FEATURE] Parse GitHub style code blocks

[GoogleCodeExporter]

GitHub uses classes to identify language, so e.g.

<pre><code class="ruby">
def foo
  puts "bar"
end
</code></pre>

Is it possible to add support to it somehow? Or there is a way to configure 
Prettify to detect language from this structure?

Original issue reported on code.google.com by hrgys...@gmail.com on 13 Jul 2013 at 12:14

[amroamroamro]

This is mentioned in the README file:

• https://github.com/google/code-prettify/blob/master/README.md#how-do-i-specify-the-language-of-my-code
• https://github.com/google/code-prettify/blob/master/README.md#i-cant-add-classes-to-my-code-because-it-comes-from-markdown-etc

So it supports language hints as class="lang-ruby" or class="language-ruby".

When it's not possible to specify classes (e.g. when converting markdown to html), you can use a preceding HTML comment or XML processing instruction to set language hint

<!--prettify lang=ruby-->

(see #250 (comment) for an example)

I'm closing this as duplicate of #224 (comment), since it seems to be asking for something similar.