Usage: php -q generator.php [OPTION] defsfile [class ...]

  -o <file>         use overrides in <file>
  -p <prefix>       use <prefix> for docs
  -r <file>         register types from <file>
  -d <path>         output files to this directory
  -s <path>         documentation dir
  -l <lang>         Language
  -u                Update existing docs