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lib.makeOverridable: simplify function arguments preservation

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Rename temporary variable copyArgs -> mirrorArgs.
Use lib.mirrorFunctionArgs to define `mirrorArgs`.
Apply mirrorArgs also to the returned function.
This commit is contained in:
Yueh-Shun Li 2023-05-29 05:52:21 +08:00
parent a16319908e
commit 6a8b6b8f72
1 changed files with 10 additions and 8 deletions
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18
lib/customisation.nix
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@ -76,19 +76,22 @@ rec {
Type:
makeOverridable :: (AttrSet -> a) -> AttrSet -> a
*/
makeOverridable = f: lib.setFunctionArgs
(origArgs: let
makeOverridable = f:
let
# Creates a functor with the same arguments as f
mirrorArgs = lib.mirrorFunctionArgs f;
in
mirrorArgs (origArgs:
let
result = f origArgs;
# Creates a functor with the same arguments as f
copyArgs = g: lib.setFunctionArgs g (lib.functionArgs f);
# Changes the original arguments with (potentially a function that returns) a set of new attributes
overrideWith = newArgs: origArgs // (if lib.isFunction newArgs then newArgs origArgs else newArgs);
# Re-call the function but with different arguments
overrideArgs = copyArgs (newArgs: makeOverridable f (overrideWith newArgs));
overrideArgs = mirrorArgs (newArgs: makeOverridable f (overrideWith newArgs));
# Change the result of the function call by applying g to it
overrideResult = g: makeOverridable (copyArgs (args: g (f args))) origArgs;
overrideResult = g: makeOverridable (mirrorArgs (args: g (f args))) origArgs;
in
if builtins.isAttrs result then
result // {
@ -102,8 +105,7 @@ rec {
lib.setFunctionArgs result (lib.functionArgs result) // {
override = overrideArgs;
}
else result)
(lib.functionArgs f);
else result);
/* Call the package function in the file `fn` with the required