contrib/cmake/parse-version.m4.py

   1 #
   2 #  OpenVPN -- An application to securely tunnel IP networks
   3 #             over a single UDP port, with support for SSL/TLS-based
   4 #             session authentication and key exchange,
   5 #             packet encryption, packet authentication, and
   6 #             packet compression.
   7 #
   8 #  Copyright (C) 2022-2023 OpenVPN Inc <sales@openvpn.net>
   9 #  Copyright (C) 2022-2022 Lev Stipakov <lev@lestisoftware.fi>
  10 #
  11 #  This program is free software; you can redistribute it and/or modify
  12 #  it under the terms of the GNU General Public License version 2
  13 #  as published by the Free Software Foundation.
  14 #
  15 #  This program is distributed in the hope that it will be useful,
  16 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 #  GNU General Public License for more details.
  19 #
  20 #  You should have received a copy of the GNU General Public License along
  21 #  with this program; if not, write to the Free Software Foundation, Inc.,
  22 #  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23 #
  24
  25 # Usage: ./parse-version.m4.py m4file [directory]
  26 # Read <m4file>, extract all lines looking like M4 define(), and translate
  27 # them into CMake style set(). Those are then written out to file
  28 # <directory>/version.cmake.
  29 # Intended to be used on top-level version.m4 file.
  30
  31 import os
  32 import re
  33 import sys
  34
  35 def main():
  36     assert len(sys.argv) > 1
  37     version_path = sys.argv[1]
  38     output = []
  39     with open(version_path, 'r') as version_file:
  40         for line in version_file:
  41             match = re.match(r'[ \t]*define\(\[(.*)\],[ \t]*\[(.*)\]\)[ \t]*', line)
  42             if match is not None:
  43                 output.append(match.expand(r'set(\1 \2)'))
  44     out_path = os.path.join("%s" %  (sys.argv[2] if len(sys.argv) > 2 else "."), "version.cmake")
  45
  46     prev_content = ""
  47     try:
  48         with open(out_path, "r") as out_file:
  49             prev_content = out_file.read()
  50     except:
  51         # file doesn't exist
  52         pass
  53
  54     content = "\n".join(output) + "\n"
  55     if prev_content != content:
  56         print("Writing %s" % out_path)
  57         with open(out_path, "w") as out_file:
  58             out_file.write(content)
  59     else:
  60         print("Content of %s hasn't changed" % out_path)
  61
  62 if __name__ == "__main__":
  63     main()