How to limit the number of -v verbosity flags.

[bric3]

I'm trying to limit the number of times the -v for verbosity can appear, so I have setup the following option with arity

    @Option(
        names = ["-v"],
        description = [
            "Specify multiple -v options to increase verbosity.",
            "For example, `-v -v -v` or `-vvv`"
        ],
        arity = "0..3"
    )
    var verbosity = booleanArrayOf()

as explained in the doc (not quite sure where source is, it seems like adoc but I only saw html files in the repo), but with the arity.

and it renders like this in the help:

  -v=[<verbosity> [<verbosity> [<verbosity>]]]
                             Specify multiple -v options to increase verbosity.
                             For example, `-v -v -v` or `-vvv`

I think I'm misusing arity here. How is it possible to do that declaratively, may this has to be something to write programatically ?

[bric3]

Actually it seems one can use bean validation annotations, or this code. (Of course removing the arity attribute).

if (verbosity.size > Logger.MAX_VERBOSITY) {
    throw ParameterException(
        spec.commandLine(),
        "Too many '-v' options, maximum verbosity: ${Logger.MAX_VERBOSITY}."
    )
}