/usr/share/Yap/pl/init.yap is in yap 5.1.3-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: init.yap *
* Last rev: *
* mods: *
* comments: initializing the full prolog system *
* *
*************************************************************************/
% This is yap's init file
% should be consulted first step after booting
% These are pseudo declarations
% so that the user will get a redefining system predicate
fail :- fail.
false :- fail.
otherwise.
!.
(:- G) :- '$execute'(G), !.
'$$!'(CP) :- '$cut_by'(CP).
[] :- true.
:- set_value('$doindex',true).
% force having indexing code for throw.
:- '$handle_throw'(_,_,_), !.
:- bootstrap('errors.yap').
:- bootstrap('consult.yap').
:- [ 'utils.yap',
'arith.yap',
'directives.yap'].
:- compile_expressions.
:- [ 'yio.yap',
'debug.yap',
'checker.yap',
'depth_bound.yap',
'grammar.yap',
'ground.yap',
'listing.yap',
'preds.yap',
% modules must be after preds, otherwise we will have trouble
% with meta-predicate expansion being invoked
'modules.yap',
'signals.yap',
'profile.yap',
'callcount.yap',
'load_foreign.yap',
'sockets.yap',
'sort.yap',
'setof.yap',
'statistics.yap',
'strict_iso.yap',
'tabling.yap',
'threads.yap',
'eam.yap',
'chtypes.yap',
'yapor.yap'].
:- dynamic prolog:'$user_defined_flag'/2.
:- multifile prolog:debug_action_hook/1.
:- source.
lists:append([], L, L).
lists:append([H|T], L, [H|R]) :-
lists:append(T, L, R).
% member(?Element, ?Set)
% is true when Set is a list, and Element occurs in it. It may be used
% to test for an element or to enumerate all the elements by backtracking.
% Indeed, it may be used to generate the Set!
lists:memberchk(X,[X|_]) :- !.
lists:memberchk(X,[_|L]) :-
lists:memberchk(X,L).
% memberchk(+Element, +Set)
% means the same thing, but may only be used to test whether a known
% Element occurs in a known Set. In return for this limited use, it
% is more efficient when it is applicable.
lists:member(X,[X|_]).
lists:member(X,[_|L]) :-
lists:member(X,L).
:- no_source.
:- ['protect.yap'].
version(yap,[5,1]).
system_mode(verbose,on) :- set_value('$verbose',on).
system_mode(verbose,off) :- set_value('$verbose',off).
:- op(1150,fx,(mode)).
:- dynamic 'extensions_to_present_answer'/1.
:- ['corout.yap',
'arrays.yap'].
:- use_module('messages.yap').
:- use_module('hacks.yap').
'$system_module'('$message').
'$system_module'('$hacks').
yap_hacks:cut_by(CP) :- '$$cut_by'(CP).
:- '$change_type_of_char'(36,7). % Make $ a symbol character
:- default_sequential(off).
:- multifile user:library_directory/1.
:- dynamic user:library_directory/1.
%
% cleanup ensure loaded and recover some data-base space.
%
:- ( recorded('$loaded','$loaded'(_,_,_),R), erase(R), fail ; true ).
:- set_value('$user_module',user), '$protect'.
:- style_check([]).
%
% moved this to init_gc in gc.c to separate the alpha
%
% :- yap_flag(gc,on).
% :- yap_flag(gc_trace,verbose).
:- system_mode(verbose,on).
:- multifile prolog:message/3.
:- dynamic prolog:message/3.
:- module(user).
:- multifile goal_expansion/3.
:- dynamic goal_expansion/3.
:- multifile term_expansion/2.
:- dynamic term_expansion/2.
:- multifile file_search_path/2.
:- dynamic file_search_path/2.
:- multifile generate_message_hook/3.
:- dynamic generate_message_hook/3.
:- multifile swi:swi_predicate_table/4.
file_search_path(library, Dir) :-
library_directory(Dir).
file_search_path(swi, Home) :-
current_prolog_flag(home, Home).
file_search_path(yap, Home) :-
current_prolog_flag(home, Home).
file_search_path(system, Dir) :-
prolog_flag(host_type, Dir).
file_search_path(foreign, yap('lib/Yap')).
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