docs: def command(self, *args, **kwargs):
          """
          Attach a command to the current :class:`CLI` object.
  
          The function should accept an instance of an
          :class:`argparse.ArgumentParser` and use it to define extra
          arguments and options. These options will only affect the specified
          command.
  
          """
  
          def wrapper(func):
              self.add_command(func, *args, **kwargs)
              return func
  
          return wrapper