docs: def run(func):
      """Execute the provided function if there are no subcommands"""
  
      @defaults.command(help='Run the service')
      @click.pass_context
      def runserver(ctx, *args, **kwargs):
          if (ctx.parent.invoked_subcommand and
                  ctx.command.name != ctx.parent.invoked_subcommand):
              return
  
          # work around the fact that tornado's parse_command_line can't
          # cope with having subcommands / positional arguments.
          sys.argv = [sys.argv[0]] + [a for a in sys.argv if a[0] == '-']
  
          sys.exit(func())
  
      return runserver