mustache_with_haml_rails3.rb

# # Be sure to install mustache gem and include mustache gem in project Gemfile.
# 
# # Template Handler
require 'mustache_rails'
# Generator
Rails.application.config.generators.template_engine :mustache

module MustacheRailsPatch

  # Overwrite render to have it render haml first when a template with .haml extension exist
  def render(*args)
    haml_template = self.class.template_file + ".haml"

    if args.empty? && File.exist?(haml_template)
      super(Haml::Engine.new(File.read(haml_template)).render)
    else
      super
    end
  end

  # Overwrite render to have it render haml first when a template with .haml extension exist
  def partial(name)
    partial_name = "_#{name}.#{Mustache::Rails::Config.template_extension}"
    template_dir = Pathname.new(self.class.template_file).dirname
    partial_path = File.expand_path("#{template_dir}/#{partial_name}")
        
    haml_template = "#{partial_path}.haml"

    if File.exist?(haml_template)
      Haml::Engine.new(File.read(haml_template)).render
    else
      super
    end
  end    
  
end

# Really hacky way to get what we want, not sure why it had to be this way
class Mustache::Rails
  def self.inherited(klass)
    klass.send(:include, MustacheRailsPatch)
  end
end