Unique shell.nix

shell.nix

{ nixpkgs ? (import (fetchTarball "channel:nixos-unstable") { })
, compiler ? "ghc8101"
}:
let
  config = {
    packageOverrides = super:
      let self = super.pkgs;
      in
      {
        haskell = super.haskell // {
          packages = super.haskell.packages // {
            ${compiler} = super.haskell.packages.${compiler}.override {
              overrides = self: super:
                with pkgs.haskell.lib;
                { };
            };
          };
        };
      };
  };

  pkgs = import <nixpkgs> { inherit config; };

  ghc = pkgs.haskell.packages.${compiler}.ghcWithHoogle (ps:
    with ps; [
      containers
      extra
      hashable
      unordered-containers
      hspec
      criterion
      QuickCheck
      quickcheck-instances
      bytestring
      hashable
    ]
  );

in
pkgs.stdenv.mkDerivation {
  name = "Unique";
  buildInputs = with pkgs; [
    cabal-install
    ghc
    which
    zlib
  ];

  shellHook = ''
    eval $(egrep ^export ${ghc}/bin/ghc)
    export HIE_HOOGLE_DATABASE="$(cat $(which hoogle) | sed -n -e 's|.*--database \(.*\.hoo\).*|\1|p')"
  '';
}