dain / git-like-cli Goto Github PK

It would be nice to support mutually exlusive option groups for a command. I am not sure what the best syntax would be - something like this, maybe:

@Option(name = "-a", group = "mutex")
String a;
@Option(name = "-b", group = "mutex")
String b;

Accept the name of a class that implements Function<String,V> to transform the String option value to the type required by the option field itself.

The command should be able to either access the Cli instance to allow them to either cause the help/usage text to be displayed, or to cause the program to exit with a specific message and status.

Detect the presence of Optional<?> as the type of a field, and set the value to Optional.absent() if no parameter is set for the option.

The parameters for an option should be validatable (beyond the allowed options property). This could be done by accepting a class name for a Predicate which tests if they are acceptable. Some standard predicates could allow things like regular expressions. For example:

@Option(name = "-v", validator = CheckValid.class)
String v;