code: def add_options(self):
          
          super(CategoryManager, self).add_options()
  
          self.add_bool_option("-l", "--list",
              help="list added category views")
          self.add_bool_option("-n", "--next",
              help="switch to next category view")
          self.add_bool_option("-p", "--prev",
              help="switch to previous category view")
          self.add_bool_option("-u", "--update",
              help="filter the current category view again")
docs: Add program options.