code: public List<TerminalString> getOptionLongNamesWithDash() {
          List<ProcessedOption> opts = getOptions();
          List<TerminalString> names = new ArrayList<>(opts.size());
          for (ProcessedOption o : opts) {
              if(o.getValues().size() == 0 &&
                      o.activator().isActivated(new ParsedCommand(this)))
                  names.add(o.getRenderedNameWithDashes());
          }
  
          return names;
      }
docs: Return all option names that not already have a value
  and is enabled