code: def cli_main():
      """Render mustache templates using json files"""
      import argparse
      import os
  
      def is_file_or_pipe(arg):
          if not os.path.exists(arg) or os.path.isdir(arg):
              parser.error("The file {0} does not exist!".format(arg))
          else:
              return arg
  
      def is_dir(arg):
          if not os.path.isdir(arg):
              parser.error(
                  "The directory {0} does not exist!".format(arg)
              )
          else:
              return arg
  
      parser = argparse.ArgumentParser(description=__doc__)
  
      parser.add_argument(
          "-v", "--version", action="version", version=version
      )
  
      parser.add_argument(
          "template", help="The mustache file", type=is_file_or_pipe
      )
  
      parser.add_argument(
          "-d",
          "--data",
          dest="data",
          help="The json data file",
          type=is_file_or_pipe,
          default={},
      )
  
      parser.add_argument(
          "-y",
          "--yaml-loader",
          dest="yaml_loader",
          help=argparse.SUPPRESS,
      )
  
      parser.add_argument(
          "-p",
          "--path",
          dest="partials_path",
          help="The directory where your partials reside",
          type=is_dir,
          default=".",
      )
  
      parser.add_argument(
          "-e",
          "--ext",
          dest="partials_ext",
          help="The extension for your mustache\
                                partials, 'mustache' by default",
          default="mustache",
      )
  
      parser.add_argument(
          "-l",
          "--left-delimiter",
          dest="def_ldel",
          help='The default left delimiter, "{{" by default.',
          default="{{",
      )
  
      parser.add_argument(
          "-r",
          "--right-delimiter",
          dest="def_rdel",
          help='The default right delimiter, "}}" by default.',
          default="}}",
      )
  
      parser.add_argument(
          "-w",
          "--warn",
          dest="warn",
          help="Print a warning to stderr for each undefined template key encountered",
          action="store_true",
      )
  
      args = vars(parser.parse_args())
  
      try:
          sys.stdout.write(main(**args))
          sys.stdout.flush()
      except SyntaxError as e:
          print("Chevron: syntax error")
          sys.exit("    " + "\n    ".join(e.args[0].split("\n")))
  
imports: import io
  import sys
label_desc: Use image node_id 3 for calling a global function with example usage: cli_main() and returns: arg, arg