diff options
Diffstat (limited to 'lib/attrsets.nix')
| -rw-r--r-- | lib/attrsets.nix | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/attrsets.nix b/lib/attrsets.nix index 1e4142562fa6..2a1b866dbc5e 100644 --- a/lib/attrsets.nix +++ b/lib/attrsets.nix @@ -435,12 +435,15 @@ rec { useful for deep-overriding. Example: - x = { a = { b = 4; c = 3; }; } - overrideExisting x { a = { b = 6; d = 2; }; } - => { a = { b = 6; d = 2; }; } + overrideExisting {} { a = 1; } + => {} + overrideExisting { b = 2; } { a = 1; } + => { b = 2; } + overrideExisting { a = 3; b = 2; } { a = 1; } + => { a = 1; b = 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. |