module Haml::Filters::Markdown

def render(text)
  engine = case @required
           when 'rdiscount'
             ::RDiscount
           when 'peg_markdown'
             ::PEGMarkdown
           when 'maruku'
             ::Maruku
           when 'bluecloth'
             ::BlueCloth
           when 'redcarpet'
             ::Redcarpet
           when 'kramdown'
             ::Kramdown::Document
           end
  engine.new(text).to_html
end