flake.nix

   1 {
   2 inputs.nixpkgs.url = "flake:nixpkgs";
   3 inputs.flake-utils.url = "github:numtide/flake-utils";
   4 outputs = inputs: inputs.flake-utils.lib.eachDefaultSystem (system: let
   5   pkgs = inputs.nixpkgs.legacyPackages.${system};
   6   ghc = null; # ghc901
   7   haskellPackages =
   8     if ghc == null
   9     then pkgs.haskellPackages
  10     else pkgs.haskell.packages.${ghc};
  11   hs = haskellPackages.extend (with pkgs.haskell.lib;
  12     packageSourceOverrides {
  13       aoc2020 = ./.;
  14     });
  15   in rec {
  16     defaultPackage = hs.aoc2020;
  17     devShell = hs.shellFor {
  18       packages = p: [ p.aoc2020 ];
  19       withHoogle = true;
  20       nativeBuildInputs = [
  21         hs.cabal-install
  22         hs.haskell-language-server
  23         #hs.hpc
  24       ];
  25       buildInputs = [
  26         #hs.ghcid
  27         #hs.ormolu
  28         #hs.hlint
  29         #pkgs.nixpkgs-fmt
  30       ];
  31     };
  32     apps = {
  33       "Day04" = { type = "app"; program = defaultPackage + "/bin/Day04"; };
  34     };
  35   }
  36 );
  37 }