Jekyll code highlighting on Heroku

The built in code highlighter in Jekyll doesn't work on Heroku due to some issues with Python. I came up with a work around by using the Pygmentize gem instead.

Gemfile

Add the Pygmentize gem to your gemfile:

gem 'pygmentize'

And run bundle install

_plugins/highlight.rb

Create a new file in the _plugins directory with the name highlight.rb. Paste the following code to make the built in code highlighter use the new Pygmentize gem:

require 'pygmentize'
class Jekyll::HighlightBlock < Liquid::Block
  def render_pygments(context, code)
    @options[:encoding] = 'utf-8'
    output = add_code_tags(
      Pygmentize.process(code, @lang),
      @lang
    )

    output = context["pygments_prefix"] + output if context["pygments_prefix"]
    output = output + context["pygments_suffix"] if context["pygments_suffix"]
    output
  end
end

Use

Just use the standard highlight blocks as usual:

``` ruby gem 'pygmentize' ```