gistfile1.rb

require 'redcloth'
module ActionView
  class TextileRenderer < ActionView::TemplateHandler
    include ActionView::TemplateHandlers::Compilable
    def compile(template)
      "textile_doc = RedCloth.new(template, [:hard_breaks]).to_html"
    end
    def cache_fragment(block, name = {}, options = nil)
      @view.fragment_for(block, name, options) do
        eval("textile_doc", block.binding)
      end
    end
  end
end

ActionView::Template.register_template_handler :txtl, ActionView::TextileRenderer