#!/usr/bin/env vpython
# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import argparse
import os
import subprocess
import sys


def main(args):
  parser = argparse.ArgumentParser()
  parser.add_argument(
      '--gyp-condition', '-c', type=str, required=True,
      help=('The gyp condition that acts as the switch. If the '
            'condition is found in environment variable GYP_DEFINES, '
            'this will execute the target script'))
  options, script_args = parser.parse_known_args()

  # Make sure that we always execute target script with python.
  if 'python' not in script_args[0]:
    script_args.insert(0, sys.executable)

  # A typical GYP_DEFINES string looks s.t like "foo=a bar=1 baz=c". We
  # tokenize the string before doing string matching.
  gyp_defines = os.environ.get('GYP_DEFINES', '').split()
  if options.gyp_condition in gyp_defines:
    subprocess.check_call(script_args)
  return 0


if __name__ == '__main__':
  main(sys.argv[1:])
