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lib: Improve overrideExisting implementation

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This commit is contained in:
Silvan Mosberger 2018-09-07 20:59:12 +02:00
parent af8125c46f
commit 5cfdec6e94
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lib/attrsets.nix
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@ -440,7 +440,7 @@ rec {
=> { a = { b = 6; d = 2; }; }
*/
overrideExisting = old: new:
old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old));
mapAttrs (name: value: new.${name} or value) old;
/* Get a package output.
If no output is found, fallback to `.out` and then to the default.