clikt/com.github.ajalt.clikt.parameters.groups/required

required

fun <T : OptionGroup> ChoiceGroup<T, T?>.required(): ChoiceGroup<T, T>

If a groupChoice or groupSwitch option is not called on the command line, throw a MissingOption exception.

Example:

option().groupChoice("foo" to FooOptionGroup(), "bar" to BarOptionGroup()).required()
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fun <T : Any> MutuallyExclusiveOptions<T, T?>.required(): MutuallyExclusiveOptions<T, T>

Make a mutuallyExclusiveOptions group required. If none of the options in the group are given, a UsageError is thrown.