Option collapseOpt = obuilder.withLongName("collapse").withRequired(true).withArgument(
      abuilder.withName("collapse").withMinimum(1).withMaximum(1).create()).withDescription(
      "Collapse a whole directory to a single file, one doc per line").withShortName("p").create();
    
    Option helpOpt = DefaultOptionCreator.helpOption();
    Group group = gbuilder.withName("Options").withOption(inputOpt).withOption(outputOpt).withOption(labelOpt)
        .withOption(analyzerOpt).withOption(charsetOpt).withOption(collapseOpt).withOption(helpOpt).create();
    try {
      Parser parser = new Parser();
      parser.setGroup(group);
      CommandLine cmdLine = parser.parse(args);