invoke

# File railties/lib/rails/command.rb, line 30
      def invoke(full_namespace, args = [], **config)
        namespace = full_namespace = full_namespace.to_s

        if char = namespace =~ /:(\w+)$/
          command_name, namespace = $1, namespace.slice(0, char)
        else
          command_name = namespace
        end

        command_name, namespace = "help", "help" if command_name.blank? || HELP_MAPPINGS.include?(command_name)
        command_name, namespace = "version", "version" if %( -v --version ).include?(command_name)

        command = find_by_namespace(namespace, command_name)
        if command && command.all_commands[command_name]
          command.perform(command_name, args, config)
        else
          find_by_namespace("rake").perform(full_namespace, args, config)
        end
      end