code: def get_pkg_info_revision():
      
      warnings.warn("get_pkg_info_revision is deprecated.", EggInfoDeprecationWarning)
      if os.path.exists('PKG-INFO'):
          with io.open('PKG-INFO') as f:
              for line in f:
                  match = re.match(r"Version:.*-r(\d+)\s*$", line)
                  if match:
                      return int(match.group(1))
      return 0
docs: Get a -r### off of PKG-INFO Version in case this is an sdist of
      a subversion revision.