#!/usr/bin/env python

# Copyright (c) 2016 Intel Corporation. All rights reserved.
# Use of this source code is governed by a MIT-style license that can be
# found in the LICENSE file.

''' This script provides utils for python scripts in crosswalk.
'''

import os
import sys
import subprocess


def TryAddDepotToolsToPythonPath():
  depot_tools = FindDepotToolsInPath()
  if depot_tools:
    sys.path.append(depot_tools)
    python_path = os.environ.get('PYTHONPATH')
    if python_path:
      os.environ['PYTHONPATH'] = os.path.pathsep.join(
          python_path.split(os.path.pathsep) + [depot_tools])
    else:
      os.environ['PYTHONPATH'] = depot_tools


def FindDepotToolsInPath():
  paths = os.getenv('PATH').split(os.path.pathsep)
  for path in paths:
    if os.path.basename(path) == '':
      # path is end with os.path.pathsep
      path = os.path.dirname(path)
    if os.path.basename(path) == 'depot_tools':
      return path
  return None


def IsWindows():
  return sys.platform == 'cygwin' or sys.platform.startswith('win')


def IsLinux():
  return sys.platform.startswith('linux')


def IsMac():
  return sys.platform.startswith('darwin')


def GitExe():
  if IsWindows():
    return 'git.bat'
  else:
    return 'git'


def GetCommandOutput(command, cwd=None):
  proc = subprocess.Popen(command, stdout=subprocess.PIPE,
                          stderr=subprocess.STDOUT, bufsize=1,
                          cwd=cwd)
  output = proc.communicate()[0]
  result = proc.returncode
  if result:
    raise Exception('%s: %s' % (subprocess.list2cmdline(command), output))
  return output