code: def main(args=None):
      """Optimize the layout tables of an existing font"""
      from argparse import ArgumentParser
  
      from fontTools import configLogger
  
      parser = ArgumentParser(
          prog="otlLib.optimize",
          description=main.__doc__,
          formatter_class=RawTextHelpFormatter,
      )
      parser.add_argument("font")
      parser.add_argument(
          "-o",
          metavar="OUTPUTFILE",
          dest="outfile",
          default=None,
          help="output file",
      )
      parser.add_argument(
          "--gpos-compression-level",
          help=COMPRESSION_LEVEL.help,
          default=COMPRESSION_LEVEL.default,
          choices=list(range(10)),
          type=int,
      )
      logging_group = parser.add_mutually_exclusive_group(
          required=False
      )
      logging_group.add_argument(
          "-v",
          "--verbose",
          action="store_true",
          help="Run more verbosely.",
      )
      logging_group.add_argument(
          "-q",
          "--quiet",
          action="store_true",
          help="Turn verbosity off.",
      )
      options = parser.parse_args(args)
  
      configLogger(
          level=(
              "DEBUG"
              if options.verbose
              else "ERROR"
              if options.quiet
              else "INFO"
          )
      )
  
      font = TTFont(options.font)
      compact(font, options.gpos_compression_level)
      font.save(options.outfile or options.font)
  
imports: from argparse import RawTextHelpFormatter
  from fontTools.otlLib.optimize.gpos import COMPRESSION_LEVEL, compact
  from fontTools.ttLib import TTFont
label_desc: Use image node_id 1 for calling a global function with example usage: main(args) without return types