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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://nixos.org/manual/nixpkgs/unstable/#haskell | Current PR: https://github.com/nixos/nixpkgs/pulls?q=is%3Apr+is%3Aopen+head%3Ahaskell-updates | Maintainer Docs: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/HACKING.md | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org | Merger Schedule: https://cloud.maralorn.de/apps/calendar/p/H6migHmKX7xHoTFa/dayGridMonth/now | Join #haskell.nix:libera.chat for question about the alternative haskell.nix infrastructure142 Servers

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8 Oct 2025
@sternenseemann:systemli.orgsterniOn reflection, 1 month + 20 days is at least a big improvement to compared to the 9.8 update, though it felt like it was taking forever this time, too. Excusable at least, given how busy some of us were and that we got unlucky with the text bug in 2.1.2.21:35:17
9 Oct 2025
@ivy:faggot.shivyis there a way to define arbitrary variables in a .cabal file that are maintained in the outputted 2nix07:16:05
@b:chreekat.netchreekatWell I know there are extension fields supported in .cabal files , but I don't know if cabal2nix knows or cares about them. (Extension fields are only documented in one place to my knowledge: https://cabal.readthedocs.io/en/stable/file-format-changelog.html#cabal-version-1-1-4)10:51:38
@sternenseemann:systemli.orgsterni
In reply to @ivy:faggot.sh
is there a way to define arbitrary variables in a .cabal file that are maintained in the outputted 2nix
no. (what for?)
12:33:02
@ivy:faggot.shivyokay ill add some and then add to cabal 2nix12:35:33
@ivy:faggot.shivyi want to track the verson of the karabiner driver in kmonad upstream12:36:07
@ivy:faggot.shivyill patch cabal2nix and do a pr for that for extension fields (i am very experienced with haskell)12:36:43
@ivy:faggot.shivyshould these x- fields be put into passthru or to the derivation itself12:41:22
@ivy:faggot.shivyi’m feeling passthru therefore i should write a passthru field to derivation adt12:42:05
@ivy:faggot.shivy idk what do yall think 12:42:18
@ivy:faggot.shivybut also could be cool to pass through to extra attributes12:45:48
@sternenseemann:systemli.orgsterniwell does kmonad even set these x-fields? would Hackage preserve them?13:05:49
@sternenseemann:systemli.orgsterniin principle seems like a feasible idea, passthru seems about right though x-revision should continue to be treated specially probably13:06:51
@sternenseemann:systemli.orgsterniwonder what other x- fields exist in the wild13:07:13
@ivy:faggot.shivynot yet it does, i will make it tho13:10:16

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