Use Jekyll with haml

default.haml

!!! 5
%html
  %head
    %title
      = site.title
  %body
    = content

haml_converter.rb

module Jekyll
  require 'haml'

  class Layout
    
    alias_method :_original_initialize, :initialize

    def initialize(*args)
      _original_initialize(*args)
      self.transform
    end

  end

  class HamlConverter < Converter

    safe true
    priority :low
    
    def matches(ext)
      ext =~ /haml/i
    end

    def output_ext(ext)
      '.html'
    end

    def convert(content)
      Haml::Engine.new(content).render
    end

  end

end