example.hs

let

  pkgs = import ./nixpkgs.nix;
  extendedPkgs = pkgs.extend pkgOverlay;

  makeHsOverrides = lib: {
    overrides = (selfHS: superHS: {
      freyja-server = lib.dontCheck (superHS.callCabal2nix "freyja-server" ./freyja-server {});
      freyja-api = lib.dontCheck (superHS.callCabal2nix "freyja-api" ./freyja-api {});
      freyja-client = lib.dontCheck (superHS.callCabal2nix "freyja-client" ./freyja-client {});
      ip-qq = superHS.callCabal2nix "ip-qq" ./ip-qq {};
      ip = lib.dontCheck superHS.ip;
      wide-word = lib.dontCheck superHS.wide-word;
      bytebuild = lib.dontCheck superHS.bytebuild;
    });
  };

  pkgOverlay = self: super: {
    haskellPackages = super.haskellPackages.override (makeHsOverrides super.haskell.lib);
  };

  hsPkgs = extendedPkgs.haskellPackages;
  server = hsPkgs.freyja-server;
  client = hsPkgs.freyja-client;
in
{
  inherit server;
  inherit client;
  shell = hsPkgs.shellFor {
    packages = p: [p.freyja-server p.freyja-client];
    withHoogle = true;
    buildInputs = [ hsPkgs.ghcide ];
  };
}