code: def render_subcommand(args):
      
      if args.subcommand == 'delete':
          return 'delete ' + args.delete_subcommand
  
      if args.subcommand in ('wal-prefetch', 'wal-push', 'wal-fetch'):
          return None
  
      return args.subcommand
docs: Render a subcommand for human-centric viewing