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lib/fixed-points: small performance improvements (#568472)

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This commit is contained in:
Johannes Kirschbauer
2026-09-30 06:57:02 +00:00
committed by GitHub
parent 842905c3e0 3647d89269
commit d9ebdedde9
1 changed files with 7 additions and 5 deletions
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12
lib/fixed-points.nix
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@@ -341,9 +341,8 @@ rec {
f: g: final: prev:
let
fApplied = f final prev;
prev' = prev // fApplied;
in
fApplied // g final prev';
fApplied // g final (prev // fApplied);
/**
Composes a list of [`overlays`](#chap-overlays) and returns a single overlay function that combines them.
@@ -409,7 +408,7 @@ rec {
```
:::
*/
composeManyExtensions = lib.foldr (x: y: composeExtensions x y) (final: prev: { });
composeManyExtensions = lib.foldr composeExtensions (final: prev: { });
/**
Create an overridable, recursive attribute set. For example:
@@ -510,13 +509,16 @@ rec {
:::
*/
toExtension =
let
inherit (lib) isFunction;
in
f:
if lib.isFunction f then
if isFunction f then
final: prev:
let
fPrev = f prev;
in
if lib.isFunction fPrev then
if isFunction fPrev then
# f is (final: prev: { ... })
f final prev
else