/** Returns a string to display usage. */
public String getUsage() {
StringBuffer usage = new StringBuffer("");
for (Option o : optsNames.values()) {
if (o.getHidden()) continue;
for (int i = 0; i < argMaxLen.size(); ++i) {
String s = (i < o.getOpts().length) ? o.getOpts()[i] : "";
int width = argMaxLen.get(i).intValue() + 1;
String f = String.format(" %-" + width + "s", s);
usage.append(f).append(" ");
}
usage.append(" ").append(o.getDesc()).append("\n");
}
return usage.toString();
}
