validate
fun validate(message: String = "Invalid value for @name: @value", predicate: (T) -> Boolean): OptionBuilder<T>(source)
Adds a validator that checks the parsed value against the given predicate. The validator only runs if the value is not null.
Parameters
message
Template message for validation errors. Supports:
@name: property name
@value: the invalid value (properly formatted)
@switches: option switches (e.g. "--port|-p")
predicate
Function that returns true if the value is valid
Adds multiple validators at once.
Parameters
validations
Pairs of (message template, predicate) for validation