code: def add_options(self, parser):
          
          parser.add_option("--with-%s" % self.name,
                            action="store_true",
                            dest=self.enable_opt,
                            help="Enable plugin %s: %s" %
                            (self.__class__.__name__, self.help())
                            )
docs: Add command-line options for this plugin.
  
          The base plugin class adds --with-$name by default, used to enable the
          plugin.