From a3115707dd1563cfdab75ae716a33aeba4c651ce Mon Sep 17 00:00:00 2001
From: Luca Bruno <lucabru@src.gnome.org>
Date: Wed, 9 Apr 2014 00:02:20 +0200
Subject: Add environment.gnome3.excludePackages

Give the user a full desktop, and the possibility to exclude
non-base packages from the default list of packages.
---
 lib/lists.nix | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/lists.nix')

diff --git a/lib/lists.nix b/lib/lists.nix
index 71a897027962b..6c7773304defe 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -226,4 +226,7 @@ in rec {
   deepSeqList = xs: y: if any (x: deepSeq x false) xs then y else y;
 
   crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f];
+
+  # List difference, xs - ys. Removes elements of ys from xs.
+  difference = xs: ys: filter (y: !(builtins.elem y ys)) xs;
 }
-- 
cgit 1.4.1