clean up Nix flake using zon2nix

[figsoda]

now updating the nix flake just needs one command (zon2nix > deps.nix) and we are no longer relying on the magic that stopped comments from working

closes #1024

also reverts #1265 and updated the comment, as comments are now allowed

[figsoda]

fixed merge conflicts

[figsoda]

cc @Techatrix @leecannon

[SuperAuguste]

Sorry for the late reply! We don't actually have any maintainers who are Nix users as far as I'm aware so this fell through the cracks.

@acristoffers sorry to bug you but you really seem to know your nix - at a glimpse this looks correct, just want to make sure I'm not missing anything; could you leave a review if you have time? :)

[acristoffers]

@figsoda did what I wanted to do since the beginning but never got to it because I didn't want to manage the dependency tree myself (which it seem zig is not going to have, it's going to be flat). So thanks @figsoda for the project and for cleaning up the mess of ((((functions)))) I had to use to do it in nix with less manual interference :)

[acristoffers]

And no problem pinging me @SuperAuguste :)

[figsoda]

resolved merge conflicts

[figsoda]

Sorry for the late reply! We don't actually have any maintainers who are Nix users as far as I'm aware so this fell through the cracks.

No worries

[Techatrix]

We don't actually have any maintainers who are Nix users as far as I'm aware

Actually, I do use NixOS as my operating system but I do not have the necessary expertise to review this PR.
But I do think that ideally there should not be any need manually manage zig dependencies with zon2nix. If there are helpers like rustPlatform.buildRustPackage, then where is something like buildZigPackage?

[figsoda]

Actually, I do use NixOS as my operating system but I do not have the necessary expertise to review this PR. But I do think that ideally there should not be any need manually manage zig dependencies with zon2nix. If there are helpers like rustPlatform.buildRustPackage, then where is something like buildZigPackage?

Unfortunately build.zig.zon uses a different hash format compared to the ones nix support, so to use these dependencies with nix, one has to either keep track of one FOD hash (like cargoHash / fetchCargoTarball) that needs to be manually updated, or the approach zon2nix takes, since the importCargoLock equivalent in zig is not possible due to the differences in hashing algorithms.

[acristoffers]

At least 1 approving review is required by reviewers with write access.

Well, that's not me 🙃

[figsoda]

resolved merge conflicts