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