From ea13e2aa87f2be34b3c66f3a65cc4400ed00f96a Mon Sep 17 00:00:00 2001
From: Jaka Hudoklin <jakahudoklin@gmail.com>
Date: Sat, 28 Feb 2015 04:02:15 +0100
Subject: [PATCH] lib/lists: add intersect and substract functions

---
 lib/lists.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/lists.nix b/lib/lists.nix
index d57c4893daa..2dda700bef3 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -233,4 +233,9 @@ rec {
         xs = unique (drop 1 list);
       in [x] ++ remove x xs;
 
+  # Intersects list 'e' and another list
+  intersect = e: filter (x: elem x e);
+
+  # Substracts list 'e' from another list
+  substract = e: filter (x: !(elem x e));
 }