code: def main():
      
      arguments = sys.argv[1:]
      # If no arguments are given, the help text of pip-accel is printed.
      if not arguments:
          usage()
          sys.exit(0)
      # If no install subcommand is given we pass the command line straight
      # to pip without any changes and exit immediately afterwards.
      if 'install' not in arguments:
          # This will not return.
          os.execvp('pip', ['pip'] + arguments)
      else:
          arguments = [arg for arg in arguments if arg != 'install']
      config = Config()
      # Initialize logging output.
      coloredlogs.install(
          fmt=config.log_format,
          level=config.log_verbosity,
      )
      # Adjust verbosity based on -v, -q, --verbose, --quiet options.
      for argument in list(arguments):
          if match_option(argument, '-v', '--verbose'):
              coloredlogs.increase_verbosity()
          elif match_option(argument, '-q', '--quiet'):
              coloredlogs.decrease_verbosity()
      # Perform the requested action(s).
      try:
          accelerator = PipAccelerator(config)
          accelerator.install_from_arguments(arguments)
      except NothingToDoError as e:
          # Don't print a traceback for this (it's not very user friendly) and
          # exit with status zero to stay compatible with pip. For more details
          # please refer to https://github.com/paylogic/pip-accel/issues/47.
          logger.warning("%s", e)
          sys.exit(0)
      except Exception:
          logger.exception("Caught unhandled exception!")
          sys.exit(1)
docs: The command line interface for the ``pip-accel`` program.