# File lib/thor.rb, line 229
    def subcommand(subcommand, subcommand_class)
      subcommands << subcommand.to_s
      subcommand_class.subcommand_help subcommand
      subcommand_classes[subcommand.to_s] = subcommand_class

      define_method(subcommand) do |*args|
        args, opts = Thor::Arguments.split(args)
        invoke_args = [args, opts, {:invoked_via_subcommand => true, :class_options => options}]
        invoke_args.unshift "help" if opts.delete("--help") || opts.delete("-h")
        invoke subcommand_class, *invoke_args
      end
      subcommand_class.commands.each do |_meth, command|
        command.ancestor_name = subcommand
      end
    end