#!/usr/bin/env python3
# Copyright 2014 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""This program wraps an arbitrary command since gn currently can only execute
scripts."""

import subprocess
import sys

from pathlib import Path

# The first two arguments can be used to specify a file to redirect the
# stdout to.
cmd = sys.argv[1:]
kwargs = {}
stdout_file = None
if cmd and cmd[0] == '--redirect-stdout':
  stdout_file = Path(cmd[1])
  kwargs = dict(stdout=subprocess.PIPE)
  cmd = cmd[2:]

# Debian cross-build support
import os
wrapper_env = os.environ.get('HOST_EXEC_WRAPPER')
if wrapper_env:
  cmd[0:0] = wrapper_env.split()

process = subprocess.Popen(cmd, **kwargs)
stdout, _ = process.communicate()
if stdout_file:
  with stdout_file.open('w') as f:
    f.write(stdout.decode('utf-8'))

result = process.returncode
if result != 0:
  # Windows error codes such as 0xC0000005 and 0xC0000409 are much easier
  # to recognize and differentiate in hex.
  if result < -100:
    # Print negative hex numbers as positive by adding 2^32.
    print('Return code is %08X' % (result + 2**32))
  else:
    print('Return code is %d' % result)
sys.exit(result)