write_build_date_header.py

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#!/usr/bin/env python

# Copyright (c) 2016 The Chromium Authors. All rights reserved.

# Use of this source code is governed by a BSD-style license that can be

# found in the LICENSE file.

"""Takes a timestamp and writes it in as readable text to a .h file."""

import argparse

import datetime

import os

import sys

def main():

  argument_parser = argparse.ArgumentParser()

  argument_parser.add_argument('output_file', help='The file to write to')

  argument_parser.add_argument('timestamp')

  args = argument_parser.parse_args()

  date = datetime.datetime.utcfromtimestamp(int(args.timestamp))

  output = ('// Generated by //build/write_build_date_header.py\n'

           '#ifndef BUILD_DATE\n'

           '#define BUILD_DATE "{:%b %d %Y %H:%M:%S}"\n'

           '#endif // BUILD_DATE\n'.format(date))

  current_contents = ''

  if os.path.isfile(args.output_file):

    with open(args.output_file, 'r') as current_file:

      current_contents = current_file.read()

  if current_contents != output:

    with open(args.output_file, 'w') as output_file:

      output_file.write(output)

  return 0

if __name__ == '__main__':

  sys.exit(main())