prolog_main:argv

As argv_options/3 in guided mode, Currently this version allows parsing argument options throwing an exception rather than calling halt/1 by passing an empty list to ParseOptions. ParseOptions:

on_error(+Goal): If Goal is halt(Code), exit with Code. Other goals are currently not supported.
options_after_arguments(+Boolean): If false (default true), stop parsing after the first positional argument, returning options that follow this argument as positional arguments. E.g, -x file -y results in positional arguments [file, '-y']
unknown_option(+Mode): One of error (default) or pass. Using pass, the option is passed in Positional. Multi-flag short options may be processed partially. For example, if -v is defined and -iv is in Argv, Positional receives '-i' and the option defined with -v is added to Options.

To be done: - When passing unknown options we may wish to process multi-flag options as a whole or not at all rather than passing the unknown flags.