code: def add_preset(self, name, desc="", note=""):
          
          policy = self.policy
          if policy.find_preset(name):
              self.ui_log.error("A preset named '%s' already exists" % name)
              return False
  
          desc = desc or self.opts.desc
          note = note or self.opts.note
  
          try:
              policy.add_preset(name=name, desc=desc, note=note, opts=self.opts)
          except Exception as e:
              self.ui_log.error("Could not add preset: %s" % e)
              return False
  
          # Filter --add-preset <name> from arguments list
          arg_index = self._args.index("--add-preset")
          args = self._args[0:arg_index] + self._args[arg_index + 2:]
  
          self.ui_log.info("Added preset '%s' with options %s\n" %
                           (name, " ".join(args)))
          return True
docs: Add a new command line preset for the current options with the
              specified name.
  
              :param name: the name of the new preset
              :returns: True on success or False otherwise