#!/usr/bin/env python

# Copyright (c) 2011 The WebRTC 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 in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

# This is a gyp wrapper for WebRTC that adds some support for how gyp
# is invoked beyond what can be done in the gclient hooks.

import glob
import os
import shlex
import sys

script_dir = os.path.dirname(__file__)
webrtc_src = os.path.abspath(os.path.join(script_dir, os.pardir))

sys.path.append(os.path.join(webrtc_src, '../', 'tools', 'gyp', 'pylib'))
import gyp

def additional_include_files(args=[]):
  """
  Returns a list of additional (.gypi) files to include, without
  duplicating ones that are already specified on the command line.
  """
  # Determine the include files specified on the command line.
  # This doesn't cover all the different option formats you can use,
  # but it's mainly intended to avoid duplicating flags on the automatic
  # makefile regeneration which only uses this format.
  specified_includes = set()
  for arg in args:
    if arg.startswith('-I') and len(arg) > 2:
      specified_includes.add(os.path.realpath(arg[2:]))

  result = []
  def AddInclude(path):
    if os.path.realpath(path) not in specified_includes:
      result.append(path)

  # Always include common.gypi & features_override.gypi
  AddInclude(os.path.join(script_dir, 'common_standalone.gypi'))
  #AddInclude(os.path.join(script_dir, 'features_override.gypi'))

  # Optionally add supplemental .gypi files if present.
  supplements = glob.glob(os.path.join(webrtc_src, '*', 'supplement.gypi'))
  for supplement in supplements:
    AddInclude(supplement)

  return result

if __name__ == '__main__':
  args = sys.argv[1:]

  # This could give false positives since it doesn't actually do real option
  # parsing.  Oh well.
  gyp_file_specified = False
  for arg in args:
    if arg.endswith('.gyp'):
      gyp_file_specified = True
      break

  # If we didn't get a file, check an env var, and then fall back to
  # assuming 'all.gyp' from the same directory as the script.
  if not gyp_file_specified:
    gyp_file = os.environ.get('WEBRTC_GYP_FILE')
    if gyp_file:
      # Note that CHROMIUM_GYP_FILE values can't have backslashes as
      # path separators even on Windows due to the use of shlex.split().
      args.extend(shlex.split(gyp_file))
    else:
      # TODO(ajm): move webrtc.gyp to script_dir?
      args.append(os.path.join(webrtc_src, 'webrtc.gyp'))

  args.extend(['-I' + i for i in additional_include_files(args)])

  # Pick depth explicitly.
  args += ['--depth', '.']

  #Building WebRTC as standalone (not as part of Chrome)
  #args += ['-D', 'webrtc_standalone=1']
  args += ['-D', 'build_with_chromium=0']

  print 'Updating projects from gyp files...'
  sys.stdout.flush()

  # Off we go...
  sys.exit(gyp.main(args))