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docs: add some docs for hackage2nix

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Carlos D 2018-08-13 14:46:11 +10:00
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doc/languages-frameworks/haskell.section.md
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@ -1047,6 +1047,19 @@ As you can see, `packunused` finds out that although the testsuite component has
no redundant dependencies the library component of `scientific-0.3.5.1` depends
on `ghc-prim` which is unused in the library.
### Using hackage2nix with nixpkgs
Hackage package derivations are found in the
[`hackage-packages.nix`](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/hackage-packages.nix)
file within `nixpkgs` and are used as the initial package set for
`haskellPackages`. The `hackage-packages.nix` file is not meant to be edited
by hand, but rather autogenerated by [`hackage2nix`](https://github.com/NixOS/cabal2nix/tree/master/hackage2nix),
which by default uses the [`configuration-hackage2nix.yaml`](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/haskell-modules/configuration-hackage2nix.yaml)
file to generate all the derivations.
To modify the contents `configuration-hackage2nix.yaml`, follow the
instructions on [`hackage2nix`](https://github.com/NixOS/cabal2nix/tree/master/hackage2nix).
## Other resources
- The Youtube video [Nix Loves Haskell](https://www.youtube.com/watch?v=BsBhi_r-OeE)