From 9d65a3cdd8d73fd92418ef317b671bd14d105141 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 23 Dec 2021 00:46:12 +0100
Subject: [PATCH] lib: add maybeHead

---
 lib/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/default.nix b/lib/default.nix
index 738e52186..574713e48 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -39,6 +39,8 @@ let
       listToAttrs (map (name: nameValuePair name set.${name})
                        (filter (flip hasAttr set) names));
 
+    maybeHead = x: if isList x && length x > 0 then head x else null;
+
     packageName = pkg:
       pkg.pname or (parseDrvName pkg.name).name;