Format help message

Call parse_args_internal - which does all the work * Then, validate the parsed arguments * This variant is used mainly for testing * @throws

* @throws std::runtime_error if argument values are not valid */

https://gist.github.com/vvb2060/a3d40084cd9273b65a15f8a351b4eb0e#file-am_proc_start-cpp

Used by print_help.

* positional: * _empty_ * '-' * '-' decimal-literal * !'-' anything */

Format usage part of help only

Don't start a thread in library constructor, do it in JNI_OnLoad instead.

* decimal-literal: * '0' * nonzero-digit digit-sequence_opt * integer-part fractional-part * fractional-part * integer-p

Getter that returns true if a subcommand is used. */

Getter that returns true for user-supplied options. Returns false if not * user-supplied, even with a default value. */