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author | Vladimír Čunát <vcunat@gmail.com> | 2017-04-14 19:11:17 +0200 |
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committer | Vladimír Čunát <vcunat@gmail.com> | 2017-04-14 19:11:17 +0200 |
commit | 2090aa4f65e860567af03cb3b7aa042df7168ead (patch) | |
tree | bdf4623501830af0cbf68f2d22075f70b38157b5 /lib/trivial.nix | |
parent | eec35cb6bd82cb0eba69c55e83990f3b9f0107dc (diff) | |
parent | 4aec96b379d3f1b89128297b0943253d6961cf94 (diff) | |
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Merge: fixup a bad merge
For details see: https://github.com/NixOS/nixpkgs/commit/24444513fb5#commitcomment-21767916
Diffstat (limited to 'lib/trivial.nix')
-rw-r--r-- | lib/trivial.nix | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/trivial.nix b/lib/trivial.nix index 6cdc869b300..62906339e60 100644 --- a/lib/trivial.nix +++ b/lib/trivial.nix @@ -85,6 +85,15 @@ rec { # argument, but it's nice this way if several uses of `extends` are cascaded. extends = f: rattrs: self: let super = rattrs self; in super // f self super; + # Compose two extending functions of the type expected by 'extends' + # into one where changes made in the first are available in the + # 'super' of the second + composeExtensions = + f: g: self: super: + let fApplied = f self super; + super' = super // fApplied; + in fApplied // g self super'; + # Create an overridable, recursive attribute set. For example: # # nix-repl> obj = makeExtensible (self: { }) |