The computed command path.  This is used for the ``usage``
        information on the help page.  It's automatically created by
        combining the info names of the chain of contexts to the root.

def command_path(self):
        """The computed command path.  This is used for the ``usage``
        information on the help page.  It's automatically created by
        combining the info names of the chain of contexts to the root.
        """
        rv = ''
        if self.info_name is not None:
            rv = self.info_name
        if self.parent is not None:
            rv = self.parent.command_path + ' ' + rv
        return rv.lstrip()