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This change was motivated by my testing of tabbyAPI. I kept doing like
`nix-build -A pkgs.tabbyAPI` and I thought, can't bild just do this? So I wrote
a file called TabbyAPI.nix with the following contents::
{ bild }: bild.pkgs.tabbyAPI
and it worked, I just needed this change to Bild.hs to supply the `bild`
argument. The benefit of using bild here is that I can get the logging,
concurrency settings, and linking to _/nix etc all by default. Plus, using a
standalone nix file like TabbyAPI.nix might be a good way to pin some package
in the build system and make sure it continues to build, test, and so on.
Also, thie means I don't sprinkle relative paths to the Bild.nix library
throughout the repo, which is bad practice anyway.
Re: explicitly exposing refernces to stable: This keeps things a bit more tidy
and less confusing when working on the nix library.
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This patch does a few things:
1. Switches from nixpkgs-unstable to nixos-unstable{,-small}, simply because
nixpkgs-unstable is not in cache.nixos.org, but nixos-unstable is, and -small
is the same but requires all tests to pass. So we should prefer
nixos-unstable-small, whenever possible.
2. Reorganizes the nixpkgs import code such that Nixpkgs.nix returns an attrset
of all the nixpkgs that I want to use, rather than putting other nixpkgs
branches into the main one as an overlay. This is much simpler and explicit,
but it meant I had to change a lot of usages throughtout the nix codebase.
3. As a consequence of 2, moves the overlays into separate files so they can be
re-used across nixpkgs branches.
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nixfmt is the soon-to-be official formatter for Nix code, as per the NixOS
GitHub group. So I figure I should just adopt it without worrying too much about
the specifics of the formatting. I just formatted everything in one go, hence
the huge diff, oh well.
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Lots of changes here but the code is much improved. The nix code is clearer and
structured better.
The Haskell code improved in response to the nix changes. I needed to use a
qualified path instead of the abspath because the BIZ_ROOT changes based on
whether bild runs in nix or runs in the user environment.
Rather than passing every argument into Builder.nix, now I just pass the json
from bild and deconstruct it in nix. This is obviously a much better design and
it only came to be after sleeping on it the other night.
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