Dynamic and/or hidden parameters?

[DrDaleks]

I have a use case where I'd like to add/remove an option based on the presence/absence of a module on the classpath. I'm assuming this is impossible to do this at compile-time, but alternatively, hiding an option from the usage printout should be possible at runtime.

One way I imagined this could be possible by calling StandardErrorHandler's printUsageDocumentation using a different CommandModel with fewer elements, but cloning or modifying the command model is currently not possible afaik.

[h908714124]

Thanks for pointing this out. I've added a new method CommandModel.toBuilder() in 5.15.

[h908714124]

I hope something like this will work:

parser.parse(List.of(args)).ifLeftOrElse(parsingFailed -> {
    CommandModel model = parsingFailed.commandModel();
    List<Option> options = model.options().stream().filter(this::isInClasspath).toList();
    StandardErrorHandler.builder().build().printUsageDocumentation(model.toBuilder().withOptions(options).build());
}, this::runCommand);