diff options
| -rw-r--r-- | lib/customisation.nix | 18 | ||||
| -rw-r--r-- | pkgs/development/haskell-modules/make-package-set.nix | 2 |
2 files changed, 19 insertions, 1 deletions
diff --git a/lib/customisation.nix b/lib/customisation.nix index 6d6c02340878..98a46ca6c616 100644 --- a/lib/customisation.nix +++ b/lib/customisation.nix @@ -51,6 +51,24 @@ rec { else { })); + /* `makeOverridable` takes a function from attribute set to attribute set and + injects `override` attibute which can be used to override arguments of + the function. + + nix-repl> x = {a, b}: { result = a + b; } + + nix-repl> y = lib.makeOverridable x { a = 1; b = 2; } + + nix-repl> y + { override = «lambda»; overrideDerivation = «lambda»; result = 3; } + + nix-repl> y.override { a = 10; } + { override = «lambda»; overrideDerivation = «lambda»; result = 12; } + + Please refer to "Nixpkgs Contributors Guide" section + "<pkg>.overrideDerivation" to learn about `overrideDerivation` and caveats + related to its use. + */ makeOverridable = f: origArgs: let ff = f origArgs; diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix index cc161e3ca2df..6ed8d0864cac 100644 --- a/pkgs/development/haskell-modules/make-package-set.nix +++ b/pkgs/development/haskell-modules/make-package-set.nix @@ -130,7 +130,7 @@ in package-set { inherit pkgs stdenv callPackage; } self // { in generateExprs name src {}) overrides; # : { root : Path - # , source-overrides : Defaulted (Either Path VersionNumber + # , source-overrides : Defaulted (Either Path VersionNumber) # , overrides : Defaulted (HaskellPackageOverrideSet) # } -> NixShellAwareDerivation # Given a path to a haskell package directory whose cabal file is |