docs: public String getOptionsHelpMessage() {
          String ls = System.getProperty("line.separator");
          usageMessage = "Available options:";
          StringBuilder sb = new StringBuilder(usageMessage);
          sb.append(ls);
          for (Option option : declaredOptions.values()) {
              String name = option.getName();
              int extraPadding = longestOptionNameLength - name.length();
              sb.append(" -").append(name);
              for (int i = 0; i < extraPadding; i++) {
                  sb.append(' ');
              }
              sb.append(DEFAULT_PADDING).append(option.getDescription()).append(ls);
          }
  
          return sb.toString();
      }