Use the Highlight_Fu plugin

1. Installation – Get the plugin via:

ruby script/install plugin http://highlightfu.googlecode.com/svn/trunk

2. Copy required Javacript and CSS to your public folder – This is easily done with the following Rake task:

rake highlight_fu:install

3. View (requirements) – Include the javascripts and CSS from your view (normally the layout):

<%= highlight_include_assets %>

4. View (requirements 2) – You also need to add the following line at the end of your view file to make it work:

<%= highlight_initialize %>

5. View – Now let’s highlight our code (the code needs to be inside a pre-block set to the programming language, e.g. Ruby:

<%= highlight(my_formatted_text) %>

Note: You can also specify some options to modify the appearance of the source code. The following example will hide the line numbers and hide the links for additional controls:

<%= highlight(my_formatted_text, [:nocontrols, :nogutter]) %>

Done

This is how I highlight the ruby code on this page. It looks like this: