use_listing_vars/0

root@gitlab:~# swipl
Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 7.3.10)
Copyright (c) 1990-2015 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

?- use_module(library(logicmoo_utils)).
% /root/lib/swipl/pack/logicmoo_base/prolog/logicmoo_utils.pl:204
% Adding logicmoo/utils to autoload path
true.

?- use_listing_vars.
true.

?- listing(ls).
shell:ls :-
        ls('.').

shell:ls(Spec) :-
        name_to_files(Spec, Matches),
        ls_(Matches).

true.