docs: def add_command(self, factory, main, name=None, context_kwargs=None):
          """
          Attach a command directly to the :class:`CLI` object.
  
          """
          if name is None:
              name = factory.__name__.replace('_', '-')
  
          if context_kwargs is None:
              context_kwargs = {}
  
          short_desc, long_desc = parse_docstring(factory.__doc__)
          if long_desc:
              long_desc = short_desc + '\n\n' + long_desc
  
          # determine the absolute import string if relative
          if isinstance(main, str) and (
              main.startswith('.') or main.startswith(':')
          ):
              module = __import__(factory.__module__, None, None, ['__doc__'])
              package = package_for_module(module)
              if main in ['.', ':']:
                  main = package.__name__
              else:
                  main = package.__name__ + main
  
          self.commands[name] = CommandMeta(
              factory=factory,
              main=main,
              name=name,
              help=short_desc,
              description=long_desc,
              context_kwargs=context_kwargs,
          )