nixpkgs.lib.functionArgs

any -> AttrSets

関数のデフォルト引数を返す関数。nixpkgs.lib.setFunctionArgsで作成されたものであれば、__functionArgsキーの値を返し、そうでない場合はbuiltins.functionArgsを使って結果を返す。

code: trivial.nix

/* Extract the expected function arguments from a function.

This works both with nix-native { a, b ? foo, ... }: style

functions and functions with args set with 'setFunctionArgs'. It

has the same return type and semantics as builtins.functionArgs.

setFunctionArgs : (a → b) → Map String Bool.

functionArgs = f:

if f ? __functor

then f.__functionArgs or (lib.functionArgs (f.__functor f))

else builtins.functionArgs f;