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lib/recursiveUpdateUntil: fix code to match documentation

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$ nix repl lib
Welcome to Nix version 2.0.2. Type :? for help.

Loading 'lib'...
Added 350 variables.

-- this is the exact example from the function's documentation:
nix-repl> recursiveUpdateUntil (path: l: r: path == ["foo"]) {
                   # first attribute set
                   foo.bar = 1;
                   foo.baz = 2;
                   bar = 3;
                 } {
                   #second attribute set
                   foo.bar = 1;
                   foo.quz = 2;
                   baz = 4;
                 }
{ bar = 3; baz = 4; foo = { bar = 1; baz = 2; quz = 2; }; }

-- although the documentation says:
{
    foo.bar = 1; # 'foo.*' from the second set
    foo.quz = 2; #
    bar = 3;     # 'bar' from the first set
    baz = 4;     # 'baz' from the second set
}
This commit is contained in:
Mathijs Kwik 2018-06-06 22:38:40 +02:00 committed by Profpatsch
parent b1cf86b8bb
commit b63ec64521
1 changed files with 3 additions and 2 deletions
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5
lib/attrsets.nix
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@ -384,11 +384,12 @@ rec {
recursiveUpdateUntil = pred: lhs: rhs:
let f = attrPath:
zipAttrsWith (n: values:
let here = attrPath ++ [n]; in
if tail values == []
|| pred attrPath (head (tail values)) (head values) then
|| pred here (head (tail values)) (head values) then
head values
else
f (attrPath ++ [n]) values
f here values
);
in f [] [rhs lhs];