use_listing_vars

packwtester@titan:~$ swipl
Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 7.3.5-38-g4eff21a)
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).

?- pack_install(logicmoo_base).
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
Install logicmoo_base@1.1.1 from http://www.prologmoo.com/packs/logicmoo_base/release/logicmoo_base-1.1.1.tgz Y/n?
% Contacting server at http://www.swi-prolog.org/pack/query ... ok
% "logicmoo_base-1.1.1.tgz" was downloaded 1 times
Package:                logicmoo_base
Title:                  Support for various Prolog programing extensions such reactive [agent] programming in FOL using forward-chaining and memoization
Installed version:      1.1.1
Author:                 Douglas R. Miles <logicmoo@gmail.com>
Home page:              https://github.com/TeamSPoon/PrologMUD/tree/master/pack/logicmoo_base
Download URL:           http://www.prologmoo.com/packs/logicmoo_base/release/logicmoo_base-1.1.1.tgz
Install "logicmoo_base-1.1.1.tgz" (2,182,372 bytes) Y/n?
true.

?- use_module(logicmoo_utils).
ERROR: source_sink `logicmoo_utils' does not exist
?- use_module(library(logicmoo_utils)).
ERROR: source_sink `library(logicmoo_utils)' does not exist
?- use_module(library(logicmoo/logicmoo_utils)).
% Updating index for library /home/packwtester/lib/swipl/pack/logicmoo_base/prolog/logicmoo/util/
% /home/packwtester/lib/swipl/pack/logicmoo_base/prolog/logicmoo/logicmoo_utils.pl:204
% Adding logicmoo/utils to autoload path
true.

?- use_listing_vars.
true.

?- listing(listing).
:- meta_predicate prolog_listing:listing(:).

prolog_listing:listing(M:Spec) :-
        var(Spec), !,
        list_module(M).
prolog_listing:listing(M:List) :-
        is_list(List), !,
        forall(member(Spec, List), listing(M:Spec)).
prolog_listing:listing(X) :-
        (   prolog:locate_clauses(X, ClauseRefs)
        ->  list_clauserefs(ClauseRefs)
        ;   '$find_predicate'(X, Preds),
            list_predicates(Preds, X)
        ).

prolog_listing:listing :-
        context_module(Context),
        list_module(Context).

true.

?-