Railscast #272 with Pygments.rb and Redcloth 2

application_helper.rb

# Authored by Braulio Carreno on railscasts site. Put here mostly as a reference for me. 
# also remember to replace albino gem with pygments.rb gem
module ApplicationHelper
  class HTMLwithPygments < Redcarpet::Render::HTML
    def block_code(code, language)
      Pygments.highlight(code, :lexer => language)
    end
  end

  def markdown(text)
    renderer = HTMLwithPygments.new(:hard_wrap => true)
    options = {
      :fenced_code_blocks => true,
      :no_intra_emphasis => true,
      :autolink => true,
      :strikethrough => true,
      :lax_html_blocks => true,
      :superscript => true
    }
    Redcarpet::Markdown.new(renderer, options).render(text)
  end
end