lib: add maybeHead

2021-12-23 00:46:12 +01:00 · 2021-12-23 00:46:12 +01:00 · 9d65a3cdd8
commit 9d65a3cdd8
parent 448cd3b9af
1 changed files with 2 additions and 0 deletions
--- 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;