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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://haskell4nix.readthedocs.io/147 Servers

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19 Aug 2025
@bglgwyng:matrix.orgbglgwyngDoes haskell.nix internally generate plan.json and use it? Or it just uses pre-built package sets.06:18:16
@maralorn:maralorn.demaralorn bglgwyng: haskell.nix uses plan.json (at least that’s one of the available modes) 06:53:04
@artem.types:matrix.orgArtem FTW: I made this typo again: liquidhaskell-boot = doJailbreak super.smtlib-backends-tests; and that's why liquidhaskell couldn't find a module in liquidhaskell-boot... 14:09:50
@artem.types:matrix.orgArtem * FTR: I made this typo again: liquidhaskell-boot = doJailbreak super.smtlib-backends-tests; and that's why liquidhaskell couldn't find a module in liquidhaskell-boot... 14:17:52
@xvwx:matrix.dapp.org.uk@xvwx:matrix.dapp.org.uk left the room.14:23:55
@artem.types:matrix.orgArtem

what is the better commit message / PR title for a nixpkgs PR:

haskellPackages.{liquidhaskell, liqquidhaskell-boot, liquid-fixpoint, smtlib-backends-process, smtlib-backends-tests}: unbreak

or

haskellPackages.liquidhaskell and dependencies: unbreak

14:28:57
@artem.types:matrix.orgArtem *

what is the better commit message / PR title for a nixpkgs PR:

haskellPackages.{liquidhaskell, liqquidhaskell-boot, liquid-fixpoint, smtlib-backends-process, smtlib-backends-tests}: unbreak

or

haskellPackages.liquidhaskell and dependencies: unbreak

?

14:29:02
@symphorien:xlumurb.eusymphorienthe ci parses commit messages, so if you do one commit per package it will build the right packages14:34:20
@artem.types:matrix.orgArtemouch, I did one commit for everything! just to double-check: is one commit per package a requirement?14:40:19
@symphorien:xlumurb.eusymphorienno14:42:05
@emilazy:matrix.orgemily it will parse {a,b} in commit messages too 14:56:04
@artem.types:matrix.orgArtemall right, I'll go with the explicit list then14:59:09
@symphorien:xlumurb.eusymphorienoh cool15:16:34
@alexfmpe:matrix.orgalexfmpewaaaat16:30:59
@alexfmpe:matrix.orgalexfmpewhere can I find these tidbits16:31:14
@emilazy:matrix.orgemilyit's in the ofborg repo docs I think16:31:57
@alexfmpe:matrix.orgalexfmpeTIL16:42:39
@alexfmpe:matrix.orgalexfmpehttps://github.com/NixOS/ofborg?tab=readme-ov-file#automatic-building16:42:40
20 Aug 2025
@kephaspierre:matrix.orgPierre Thierry I've looked at documentation and source code but I don't see how I can use developPackage and add additional packages to the environment (ideally they would only be added when using a shell). I guess that's done with the modifier attribute? 18:02:08
@kephaspierre:matrix.orgPierre Thierry(I'd like to add packages like HLS and hlint)18:02:32
@artem.types:matrix.orgArtemhow do I get a sense of when the GHC 9.10 bump will be merged into staging? I saw a long list of failures but surely not everything has to be fixed before the merge. I also saw "We only do the merge if the mergeable job is succeeding on hydra" but how do I get a sense of close it is to succeeding?19:39:21

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