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     devShell = hs.shellFor {
  17       packages = p: [ p.aoc2020 ];
  18       withHoogle = false;
  19       nativeBuildInputs = [
  20         hs.cabal-install
  21         hs.haskell-language-server
  22         #hs.hpc
  23       ];
  24       buildInputs = [
  25         #hs.ghcid
  26         #hs.ormolu
  27         #hs.hlint
  28         #pkgs.nixpkgs-fmt
  29       ];
  30     };
  31     defaultPackage = hs.aoc2020;
  32     apps = pkgs.lib.genAttrs [
  33         "Day04"
  34       ] (day: {
  35         type = "app";
  36         program = "${defaultPackage}/bin/${day}";
  37       }
  38     );
  39   }
  40 );
  41 }