Feature/argument arg explicit

[shadowspawn]

Pull Request

Fill out the Argument methods to allow explicit configuration of required/optional with a fluent method. This is an alternative to implicit syntax using brackets in name string.

Related: #1359 (comment)

Problem

The syntax for required (<arg>) and optional ([arg]) command-arguments needs to be learned. (However, this is consistent with the syntax shown in the help so is actually useful to learn!)

Solution

Offer an explicit method to set whether option is required or optional.

program.addArgument(new Argument('foo').argRequired());
program.addArgument(new Argument('bar').argOptional());

The method naming is intended to be the same for adding matching methods to Option in future.

ChangeLog

• add Argument methods for .argRequired() and .argOptional().

[abetomo]

LGTM

[shadowspawn]

Released in Commander v8.1