#!/usr/bin/python
#
# Copyright (C) 2011 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This script is a wrapper which invokes gyp with the correct --depth argument,
# and supports the automatic regeneration of build files if all.gyp is
# changed (Linux-only).

import glob
import os
import shlex
import sys

script_dir = os.path.dirname(__file__)

# Directory within which we can find the gyp source.
gyp_source_dir = os.path.join(script_dir, 'third_party', 'externals', 'gyp')

# Directory within which we can find most of Skia's gyp configuration files.
gyp_config_dir = os.path.join(script_dir, 'gyp')

# Directory within which we want all generated files (including Makefiles)
# to be written.
output_dir = os.path.join(os.path.abspath(script_dir), 'out')

sys.path.append(os.path.join(gyp_source_dir, 'pylib'))
import gyp

def additional_include_files(args=[]):
  # 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
  AddInclude(os.path.join(gyp_config_dir, 'common.gypi'))

  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, then fall back to assuming 'skia.gyp' from the
  # same directory as the script.
  if not gyp_file_specified:
    args.append(os.path.join(script_dir, 'skia.gyp'))

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

  # Tell gyp to write the Makefiles into output_dir
  args.extend(['--generator-output', os.path.abspath(output_dir)])

  # Tell make to write its output into the same dir
  args.extend(['-Goutput_dir=.'])

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

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