hjs sprocket template, put in your rails3 app as initializer

hjs_template.rb

require 'tilt'
module Sprockets
  # Tilt engine class for the Hjs compiler. Depends on the `Haml` and `ejs` gem.

  class HjsTemplate < Tilt::Template
    # Check to see if HAML is loaded
    def self.engine_initialized?
      defined? HAML && defined? ::Eco
    end

    # Autoload ejs library. If the library isn't loaded, Tilt will produce
    # a thread safetly warning. If you intend to use `.ejs` files, you
    # should explicitly require it.
    def initialize_engine
      require_template_library 'eco'
    end

    def prepare
    end

    # Compile template data with EJS compiler.
    #
    # Returns a JS function definition String. The result should be
    # assigned to a JS variable.
    #
    #     # => "function(obj){...}"
    #
    def evaluate(scope, locals, &block)
      data.force_encoding("UTF-8") if data.respond_to?(:force_encoding)
      context = Object.new
      class << context
        include Haml::Helpers
        include ActionView::Helpers

        def erb str, &block
          return "<%#{str}%>" unless block_given?
          erb("#{str}") + capture_haml(&block).chomp
        end

      end
      Eco.compile CGI.unescapeHTML("#{Haml::Engine.new(data).render(context)}")
    end
  end
end

TODO

- puts this in application.rb

  # Sprockets::HjsTemplate
  Sprockets.register_engine '.hjs', Sprockets::HjsTemplate

- add those gems in Gemfile:

  gem 'haml'
  gem 'eco'

Then use can use templates like this:

%h1 Edit post
%form#edit-post{:name => "post"}
  = erb 'if @title:' do
    .field
      = erb 'if false:' do
        = label_tag :title
      = erb 'end'
      = text_field_tag :title, erb('=@title')
  = erb 'else:' do
    .field
      = label_tag :content
      = text_field_tag :content, erb('=@content')
  = erb 'end'

  .actions
    = submit_tag "Update post"
= link_to 'Back1asd', "#/index"

Where does the hjs_template.rb live?

config/initializers i guess :)