gem

# File railties/lib/rails/generators/actions.rb, line 52
      def gem(*args)
        options = args.extract_options!
        name, version = args

        # Set the message to be shown in logs. Uses the git repo if one is given,
        # otherwise use name (version).
        parts, message = [ name.inspect ], name
        if version ||= options.delete(:version)
          parts   << version.inspect
          message << " (#{version})"
        end
        message = options[:git] if options[:git]

        log :gemfile, message

        options.each do |option, value|
          parts << ":#{option} => #{value.inspect}"
        end

        in_root do
          str = "gem #{parts.join(", ")}"
          str = "  " + str if @in_group
          str = "\n" + str
          append_file "Gemfile", str, :verbose => false
        end
      end