#!/usr/bin/env python2.7
# Copyright 2019 The Fuchsia 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 sys

# Copies a .packages file from one location to another, updating relative paths
# in the file in the process.

def main():
  parser = argparse.ArgumentParser()
  parser.add_argument('--source',
                      help='Path to the original .packages file',
                      required=True)
  parser.add_argument('--destination',
                      help='Path to the new .packages file',
                      required=True)
  args = parser.parse_args()

  source_base = os.path.dirname(args.source)
  dest_base = os.path.dirname(args.destination)

  with open(args.source, 'r') as source_file:
    with open(args.destination, 'w') as dest_file:
      for _, line in enumerate(source_file):
        name, location = line.strip().split(':', 1)
        new_location = os.path.relpath(os.path.join(source_base, location),
                                       dest_base)
        dest_file.write('%s:%s\n' % (name, new_location))


if __name__ == '__main__':
    sys.exit(main())