AssetFile for Rake Pipeline for use with ember.js/handlebars

AssetFile

require "json"
require "rake-pipeline-web-filters"

input "assets"
output "public"

class HandlebarsFilter < Rake::Pipeline::Filter
  def initialize(&block)
    block ||= proc { |input| input.sub(/\.handlebars$/, '.js') }
    super(&block)
  end

  def generate_output(inputs, output)
    inputs.each do |input|
      output.write "return Ember.Handlebars.compile(#{input.read.to_json})"
    end
  end
end

match "*.js" do
  minispade :module_id_generator => proc { |input| File.basename(input.fullpath, ".js") }
  concat [
    "javascripts/lib/jquery.js",
    "javascripts/lib/ember.js"
  ], "application.js"
end

match "*.handlebars" do
  filter HandlebarsFilter
  minispade :module_id_generator => proc { |input| File.basename(input.fullpath, ".js") + "_template" }
  concat "templates.js"
end