| 23 Aug 2025 |
 Pierre Thierry | In reply to @magthe:tchncs.de
This is how I do it. At least at the moment, things change as I learn more Nix.
https://gitlab.com/magus/nix-setups/-/tree/main/hs-shell?ref_type=heads I finally found a way where I wrote the least possible amount in my shell.nix, I do import project.nix (I run cabal2nix . > project.nix when my cabal file changes), and I use builtins.functionArgs to see every package I need, and use that in a pkgs.mkShell { packages = [ pkgs.hlint pkgs.haskell-language-server (pkgs.haskellPackages.ghcWithPackages getDeps)] | 23:26:40 |
| 24 Aug 2025 |
 sterni (he/him) | if you have the generated file you can just use haskell.packages.${your-pkg-set}.shellFor { packages = p: [ (p.callPackage ./project.nix { }) ]; nativeBuildInputs = [ /* other tools */ ]; }. | 14:10:00 |
 Ember Void | I no longer use nix for haskell packages, they're always out of date with hackage, so I just have my shell.nix including the correct ghc and cabal and then use cabal for the rest | 14:34:34 |
|  M̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ changed their profile picture. | 19:10:01 |
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| 25 Aug 2025 |
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|  mra joined the room. | 07:25:22 |
| mra | Howdy! Having some issues trying to set up a flake for development. I'm trying to use Clash to do FPGA stuff. The authors of Clash provide this starter template: https://github.com/clash-lang/clash-starters/tree/main/simple-nix, but I wanted to try to make a flake, thinking that it would be simpler to simply define a package, and then use nix develop to obtain a dev environment. I wrote this flake: https://paste.rs/guCkG.txt and just replaced all of the .nix files with this. It seems to work, but when I attempt to run the clash executable, I get a weird error: "<command line>: Could not find module ‘GHC.TypeLits.KnownNat.Solver’.". I can't figure out what causes this, and it doesn't happen when I run nix-develop in the root of the template as given, which is strange, since in both cases the build is just using runCabal2nix, rather than explicitly including this GHC plugin as a build input explicitly. | 07:29:35 |
 maralorn | @morgan.arnold:matrix.org One theory would be, that your flake is picking a different nixpkgs version. The template seems to be pinned to a known good version. | 07:51:34 |
| mra | oh, that's bizarre. somehow didn't notice all of the weirdness in the nix/ directory... is there a straightforward way of copying over the nix/ directory and then using that as the nixpkgs input for my flake? that seems like the simplest way to ensure that the versions are all good | 08:29:59 |
