Returns commands, which can be filtered by name.

        :param name: name of the command
        :type name: str
        :return: None, single command or dict of commands

def get(self, name=None):
        """
        Returns commands, which can be filtered by name.

        :param name: name of the command
        :type name: str
        :return: None, single command or dict of commands
        """
        return self.app.commands.get(name, self.plugin)