#!/usr/bin/env python
"""
Reads a pattern database and generates the corresponding
header file.
"""
import mk_util
import argparse
import logging
import os
import sys

def main(args):
  logging.basicConfig(level=logging.INFO)
  parser = argparse.ArgumentParser(description=__doc__)
  parser.add_argument("db_file", help="pattern database file")
  parser.add_argument("output_file", help="output header file path")
  pargs = parser.parse_args(args)

  if not os.path.exists(pargs.db_file):
    logging.error('"{}" does not exist'.format(pargs.db_file))
    return 1

  if (os.path.exists(pargs.output_file) and
     not os.path.isfile(pargs.output_file)):
       logging.error('Refusing to overwrite "{}"'.format(
         pargs.output_file))
       return 1

  mk_util.mk_pat_db_internal(pargs.db_file, pargs.output_file)
  return 0

if __name__ == '__main__':
  sys.exit(main(sys.argv[1:]))