# File lib/rubigen/scripts/destroy.rb, line 8
    def usage_message
      usage = "\nInstalled Generators\n"
      RubiGen::Base.sources.each do |source|
        label = source.label.to_s.capitalize
        names = source.names
        usage << "  #{label}: #{names.join(', ')}\n" unless names.empty?
      end

      # TODO - extensible blurbs for rails/newgem/adhearsion etc
      # e.g. for rails script/destroy
      # http://github.com/rails/rails/tree/daee6fd92ac16878f6806c3382a9e74592aa9656/railties/lib/rails_generator/scripts/destroy.rb
      usage << "\nThis script will destroy all files created by the corresponding\nscript/generate command. For instance, script/destroy test_unit create_post\nwill delete the appropriate test_create_post.rb file in /test.\n\nFor instructions on finding new generators, run script/generate\n"
      return usage
    end