if (f1.isDirectory()) {
            return f1name.compareToIgnoreCase(f2name);
        }
        i = f1name.lastIndexOf('.');
        t1 = i == -1 ? "" : f1name.substring(i + 1);
        i = f2name.lastIndexOf('.');
        t2 = i == -1 ? "" : f2name.substring(i + 1);

        i = t1.compareToIgnoreCase(t2);
        if (i == 0) {
            return f1name.compareToIgnoreCase(f2name);
        }
        return i;
    }

        if (f1.isDirectory()) {
            return f1name.compareToIgnoreCase(f2name);
        }
        i = f1name.lastIndexOf('.');
        t1 = i == -1 ? "" : f1name.substring(i + 1);
        i = f2name.lastIndexOf('.');
        t2 = i == -1 ? "" : f2name.substring(i + 1);

        i = t1.compareToIgnoreCase(t2);
        if (i == 0) {
            return f1name.compareToIgnoreCase(f2name);
        }
        return i;
    }

            String s1 = opt1.getOpt() != null ? opt1.getOpt() : opt1.getLongOpt();
            String s2 = opt2.getOpt() != null ? opt2.getOpt() : opt2.getLongOpt();
            return s1.compareToIgnoreCase(s2);
        }
    }

    private static class CLIManagerExtension extends CLIManager {
        public Collection<Option> getOptions() {
            List<Option> optList = new ArrayList<>(options.getOptions());