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Understand :-initialization(Goal) directive

--- a/dat.h

+++ b/dat.h

@@ -25,4 +25,5 @@

 	NumberFloat,

 };

-int debug;

\ No newline at end of file

+int debug;

+Term *initgoals;

\ No newline at end of file

--- a/example.pl

+++ b/example.pl

@@ -16,10 +16,11 @@

 could_be_friends(Person1, Person2) :-

 	likes(Person1, Thing1),

 	likes(Person2, Thing2),

-	!,

 	Thing1 = Thing2.

 list1(A) :- A = [1,2,3,4].

 list2(A) :- A = [a,b|c].

-curly(A) :- A = {one,two,three}.

\ No newline at end of file

+curly(A) :- A = {one,two,three}.

+

+:- initialization(could_be_friends(bob, sam)).

\ No newline at end of file

--- a/main.c

+++ b/main.c

@@ -33,6 +33,11 @@

 		Term *clause;

 		for(clause = prog; clause != nil; clause = clause->next)

 			print("%S.\n", prettyprint(clause));

+

+		Term *goal;

+		for(goal = initgoals; goal != nil; goal = goal->next){

+			print("Running query: %S\n", prettyprint(goal));

+		}

 	}

 	exits(nil);

--- a/parser.c

+++ b/parser.c

@@ -86,6 +86,7 @@

 		print("Could not open file\n");

 		return nil;

 	}

+	initgoals = nil;

 	initoperators();

 	nexttoken();

@@ -105,8 +106,13 @@

 		syntaxerror("prologtext");

 	if(t->tag == CompoundTerm && runestrcmp(t->text, L":-") == 0 && t->arity == 1){

-		/* A Directive */

-		print("Got directive: %S\n", prettyprint(t));

+		Term *body = t->children;

+		print("Got directive: %S\n", prettyprint(body));

+		if(body->tag == CompoundTerm && body->arity == 1 && runestrcmp(body->text, L"initialization") == 0){

+			Term *tmp = initgoals;

+			initgoals = body->children;

+			initgoals->next = tmp;

+		}

 		t = prologtext();

 	}else if(t->tag == CompoundTerm && runestrcmp(t->text, L":-") == 0 && t->arity == 2){

 		t->next = prologtext();