Pygments for me has been easy to get working on my blog but extremely difficult and so far impossible for me to customize. My blog is Ruby based and so first of

Pygments for me has been easy to get working on my blog but extremely difficult and so far impossible for me to customize. My blog is Ruby based and so first of all I don't quite understand how a python program can be added as a ruby gem. Second, I really don't understand how to create my own lexer. Do I edit the Ruby gem? Do I need to create my own gem? If I edit the gem locally I may be able to do something but how do those edits get to Heroku? The task is much more complicated than I have the knowledge for.