# Copyright (c) 2011 The Chromium Embedded Framework Authors. All rights
# reserved. Use of this source code is governed by a BSD-style license that
# can be found in the LICENSE file.

from date_util import *
from file_util import *
from optparse import OptionParser
from svn_util import *
import sys

# cannot be loaded as a module
if __name__ != "__main__":
    sys.stderr.write('This file cannot be loaded as a module!')
    sys.exit()


# parse command-line options
disc = """
This utility creates the version header file.
"""

parser = OptionParser(description=disc)
parser.add_option('--header', dest='header', metavar='FILE',
                  help='output version header file [required]')
parser.add_option('-q', '--quiet',
                  action='store_true', dest='quiet', default=False,
                  help='do not output detailed status information')
(options, args) = parser.parse_args()

# the header option is required
if options.header is None:
    parser.print_help(sys.stdout)
    sys.exit()

def write_svn_header(file):
    """ Creates the header file for the current revision if the revision has
        changed or if the file doesn't already exist. """
    if path_exists(file):
        oldcontents = read_file(file)
    else:
        oldcontents = ''

    newcontents = '// This file is generated by the make_version_header.py tool.\n'+\
                  '#ifndef _VERSION_H\n'+\
                  '#define _VERSION_H\n'+\
                  '\n'+\
                  '#define SVN_REVISION ' + get_revision() + '\n'+\
                  '#define COPYRIGHT_YEAR ' + get_year() + '\n'+\
                  '\n'+\
                  '#define DO_MAKE_STRING(p) #p\n'+\
                  '#define MAKE_STRING(p) DO_MAKE_STRING(p)\n'+\
                  '\n'+\
                  '#endif\n'
    if newcontents != oldcontents:
        write_file(file, newcontents)
        return True

    return False

written = write_svn_header(options.header)
if not options.quiet:
  if written:
    sys.stdout.write('File '+options.header+' updated.\n')
  else:
    sys.stdout.write('File '+options.header+' is already up to date.\n')