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author | Silvan Mosberger <infinisil@icloud.com> | 2019-09-05 00:13:24 +0200 |
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committer | Silvan Mosberger <infinisil@icloud.com> | 2019-09-05 00:56:39 +0200 |
commit | d54bdf5504cfe43937e4cfc1f3e03ad621f74b87 (patch) | |
tree | 72b9d8586dff57f6e2148666a7d8c3c60a877f5e /lib | |
parent | e140d709c43ab25d993c5c78b4e01aee754b49af (diff) | |
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lib/makeOverridable: Propagate function arguments to override functions
This allows querying the arguments you can .override: nix-repl> lib.functionArgs pkgs.hello.override { fetchurl = false; stdenv = false; }
Diffstat (limited to 'lib')
-rw-r--r-- | lib/customisation.nix | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/customisation.nix b/lib/customisation.nix index 21bab1ab4bcd..09d7fbf74b0f 100644 --- a/lib/customisation.nix +++ b/lib/customisation.nix @@ -67,12 +67,14 @@ rec { makeOverridable = f: origArgs: let ff = f origArgs; + # Creates a functor with the same arguments as f + copyArgs = g: lib.setFunctionArgs g (lib.functionArgs f); overrideWith = newArgs: origArgs // (if lib.isFunction newArgs then newArgs origArgs else newArgs); # Re-call the function but with different arguments - overrideArgs = newArgs: makeOverridable f (overrideWith newArgs); + overrideArgs = copyArgs (newArgs: makeOverridable f (overrideWith newArgs)); # Change the result of the function call by applying g to it - overrideResult = g: makeOverridable (args: g (f args)) origArgs; + overrideResult = g: makeOverridable (copyArgs (args: g (f args))) origArgs; in if builtins.isAttrs ff then (ff // { override = overrideArgs; |