write_asset_file_contents minified.rb

require 'lib/jsmin'

# override the write_asset_file_contents so that it will minify js in production via jsmin.rb
module ActionView
  module Helpers
    module AssetTagHelper
      alias_method :write_asset_file_contents_stock, :write_asset_file_contents
      def write_asset_file_contents(joined_asset_path, asset_paths)
        ret = write_asset_file_contents_stock(joined_asset_path, asset_paths)
        
        if File.extname(joined_asset_path) == ".js"
          tmp_path = "#{RAILS_ROOT}/tmp/asset_combined.js"
          FileUtils.cp(joined_asset_path, tmp_path)
          File.open(tmp_path, 'r') do |tmp|
             File.open(joined_asset_path, 'w') { |file| file.write(JSMin.minify(tmp)) }
           end
          FileUtils.rm(tmp_path)
        end
        
        ret
      end
    end
  end
end