public static String helpInfo() {
    StringBuilder help = new StringBuilder("Arguments:\n");
    String line = null;
    for (Argument arg : arguments.values()) {
      line = arg.description() == null? String.format("\t-%s,--%s: %s\n", arg.shortKey(), arg.fullKey(), arg.description()):
        String.format("\t-%s,--%s=%s: %s\n", arg.shortKey(), arg.fullKey(), arg.valueFormat(), arg.description());
      help.append(line);
    }
    return help.toString();
  }