From 9d5c9d3fe5d8951fac0902abf125c68a6e720e52 Mon Sep 17 00:00:00 2001
From: Peter Mikkelsen <peter@pmikkelsen.com>
Date: Tue, 13 Jul 2021 18:36:04 +0000
Subject: Implement sort/2 and setof/3

---
 stdlib.pl | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/stdlib.pl b/stdlib.pl
index 7e4822d..803c0ee 100644
--- a/stdlib.pl
+++ b/stdlib.pl
@@ -299,6 +299,10 @@ bagof_next_s([H|T], WT_list, Rest) :-
 	; Rest = Rest0
 	).
 
+setof(Template, Goal, Instances) :-
+	bagof(Template, Goal, Instances_list),
+	sort(Instances_list, Instances).
+
 % misc helpers
 
 variable_set(Term, []) :-
@@ -357,3 +361,19 @@ variant_list([], []).
 variant_list([H1|T1], [H2|T2]) :-
 	variant(H1, H2),
 	variant_list(T1, T2).
+
+% Sorting, which also removes duplicates (should be implemented in C for speed I think).
+
+sort(Ls0, Ls) :-
+	append(Lefts, [A,B|Rights], Ls0),
+	A @> B,
+	!,
+	append(Lefts, [B,A|Rights], Ls1),
+	sort(Ls1, Ls).
+sort(Ls0, Ls) :-
+	append(Lefts, [A,B|Rights], Ls0),
+	A == B,
+	!,
+	append(Lefts, [A|Rights], Ls1),
+	sort(Ls1, Ls).
+sort(Ls, Ls).
\ No newline at end of file
-- 
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