assets.rb

require "yui/compressor"
require "sass"
require 'sprockets'
require 'opal'

module Assets

  Opal = ::Opal
  Sprockets = ::Sprockets

  #this is a class for file dependencies (i.e, this class relies on the class Mime_Types to be loaded, and so it will)
  Registry.add self, to: :utilities, deps: [
    {type: :utilities, key:'Mime_Types'}
  ]


  class << self
    attr_reader :get_asset
    attr_accessor :opal_config
  end

  @get_asset = Proc.new { |captures|
    file_name,extention = captures
    content_type(Mime_Types[extention])
    settings.assets["#{file_name}.#{extention}"]
  }


  def self.included base
    base.class_exec(self) do |assets|
      asset_types = nil
      configure do
        set :assets, Sprockets::Environment.new
        settings.assets.tap do |s|
          #register opal
          s.register_engine '.orb', Opal::Processor

          # add app root
          s.append_path settings.root

          assets_root = "#{settings.root}/#{settings.asset_root}"

          ##set up "traditional" assets
          (asset_types = %w{javascripts stylesheets fonts images}).each do |asset_folder|
            s.append_path "#{assets_root}/#{asset_folder}"
          end

          ##set up opal paths
          Opal.append_path "#{settings.root}/components"
          Opal.paths.each {|p| s.append_path p}

          #set up compressers and pre-proccessors
          s.js_compressor = YUI::JavaScriptCompressor.new
          s.css_compressor = YUI::CssCompressor.new

        end

      end

      Opal::Processor.source_map_enabled = false

      ##add asset routes for asset_root folder

      get %r{/#{settings.asset_root}/(.*)(\W.*)$} do
        self.instance_exec(params[:captures],&assets.get_asset)
      end

      #add asset types
      asset_types.each do |asset_type|
        get %r{/#{settings.asset_root}/#{asset_type}/(.*)(\W.*)$} do
          self.instance_exec(params[:captures],&assets.get_asset)
        end
      end

    end
  end
end