haml_converter.rb

## haml_converter.rb
# _plugins/haml_converter.rb

module Jekyll
  class HamlConverter < Converter
    safe true

    def setup
      return if @setup
      require 'haml'
      @setup = true
    rescue
      STDERR.puts 'do `gem install haml`'
      raise FatalException.new("Missing dependency: haml")
    end

    def matches(ext)
      ext =~ /haml/i
    end

    def output_ext(ext)
      ".html"
    end

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

## home.haml
---
---
<!-- _layouts/home.haml -->
%html
  %head
    %title= page.title
  %body
    #container
      #header HEADER
      #content
        = content
      #footer FOOTER

## index.haml
---
layout: home
title: Home Page
---
%h1 Hello World?