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| author | Yueh-Shun Li <shamrocklee@posteo.net> | 2023-05-29 05:51:52 +0800 |
|---|---|---|
| committer | Yueh-Shun Li <shamrocklee@posteo.net> | 2023-11-07 01:58:04 +0000 |
| commit | a16319908e7bda2a9744114396e5e32a4ff6a3fc (patch) | |
| tree | ee927a4d70feb9dba6a33ac720c8f08239fb044f /lib | |
| parent | 32ea236e59f3af1b96812d3365ae6f58437a898e (diff) | |
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lib.mirrorFunctionArgs: init
Co-authored-by: Silvan Mosberger <github@infinisil.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/default.nix | 2 | ||||
| -rw-r--r-- | lib/trivial.nix | 34 |
2 files changed, 35 insertions, 1 deletions
diff --git a/lib/default.nix b/lib/default.nix index fe737a125e6..0dac50a08ca 100644 --- a/lib/default.nix +++ b/lib/default.nix @@ -74,7 +74,7 @@ let importJSON importTOML warn warnIf warnIfNot throwIf throwIfNot checkListOfEnum info showWarnings nixpkgsVersion version isInOldestRelease mod compare splitByAndCompare - functionArgs setFunctionArgs isFunction toFunction + functionArgs setFunctionArgs isFunction toFunction mirrorFunctionArgs toHexString toBaseDigits inPureEvalMode; inherit (self.fixedPoints) fix fix' converge extends composeExtensions composeManyExtensions makeExtensible makeExtensibleWithCustomName; diff --git a/lib/trivial.nix b/lib/trivial.nix index c23fc6070be..a89c1aa25b1 100644 --- a/lib/trivial.nix +++ b/lib/trivial.nix @@ -449,6 +449,40 @@ rec { (f ? __functor && isFunction (f.__functor f)); /* + `mirrorFunctionArgs f g` creates a new function `g'` with the same behavior as `g` (`g' x == g x`) + but its function arguments mirroring `f` (`lib.functionArgs g' == lib.functionArgs f`). + + Type: + mirrorFunctionArgs :: (a -> b) -> (a -> c) -> (a -> c) + + Example: + addab = {a, b}: a + b + addab { a = 2; b = 4; } + => 6 + lib.functionArgs addab + => { a = false; b = false; } + addab1 = attrs: addab attrs + 1 + addab1 { a = 2; b = 4; } + => 7 + lib.functionArgs addab1 + => { } + addab1' = lib.mirrorFunctionArgs addab addab1 + addab1' { a = 2; b = 4; } + => 7 + lib.functionArgs addab1' + => { a = false; b = false; } + */ + mirrorFunctionArgs = + # Function to provide the argument metadata + f: + let + fArgs = functionArgs f; + in + # Function to set the argument metadata to + g: + setFunctionArgs g fArgs; + + /* Turns any non-callable values into constant functions. Returns callable values as is. |