My Thor action for concatenating and minifying JavaScript

concat-and-minify.rb

# module: javascript
class Javascript < Thor
  include Thor::Actions

  desc "compile", "Combine and minify JavaScript files to js/master.js"
  method_option :minify, :type => :boolean, :default => true
  method_option :munge, :type => :boolean, :default => false
  def compile
    %w(rubygems sprockets yui/compressor).each {|lib| require lib }

    say "Setting up Sprockets...", :blue
    sprockets = Sprockets::Secretary.new({
      :asset_root => File.dirname(__FILE__),
      :load_path => File.join(File.dirname(__FILE__), 'js'),
      :source_files => [File.join(File.dirname(__FILE__), 'js', 'main.js')]
    })

    say "Combining JS files...", :blue
    combined = sprockets.concatenation

    if options.minify
      say "Compressing master JS...", :blue
      yui = YUI::JavaScriptCompressor.new(:munge => options.munge)
      master_js = yui.compress(combined.to_s)
    else
      master_js = combined.to_s
    end

    say "Writing output to js/master.js", :yellow
    File.open(File.join(File.dirname(__FILE__), 'js', 'master.js'), 'w') {|file| file.write(master_js) }
    say "Done!", :green
  end
end