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"""Litify a .proto file.

This program add a line
  "option optimize_for = LITE_RUNTIME;"
to the input .proto file.
"""

import fileinput
import optparse

LITE_OPTIMIZER = 'option optimize_for = LITE_RUNTIME;'


def ParseOption():
  parser = optparse.OptionParser()
  parser.add_option('--in_file_path', dest='in_file_path',
                    help='Specify the input protocol buffer definition file.')
  parser.add_option('--out_file_path', dest='out_file_path',
                    help='Specify the result file name.')
  (options, _) = parser.parse_args()
  return options


def ExecuteLitify(in_file_path, out_file_path):
  output_file = open(out_file_path, 'w')
  for line in fileinput.input(in_file_path):
    output_file.write(line)
  output_file.write('\n%s\n' % LITE_OPTIMIZER)
  output_file.close()


def main():
  options = ParseOption()
  ExecuteLitify(options.in_file_path, options.out_file_path)

if __name__ == '__main__':
  main()