default.nix

let
  compiler = "ghc865";
  static-haskell-nix = fetchGit (builtins.fromJSON (builtins.readFile ./nix/static-haskell-rev.json));
  pinnedPkgs = (import (static-haskell-nix + "/nixpkgs.nix"));
  staticPkgs = (import (static-haskell-nix + "/survey") {
    normalPkgs = extendedPkgs;
    inherit compiler;
  }).pkgs;

  extendedPkgs = staticPkgs.extend pkgOverlay;  
  makeHsOverrides = lib: {
    overrides = (selfHS: superHS: {
      freyja = superHS.callCabal2nix "freyja" ./. {};
      freyja-api = superHS.callCabal2nix "freyja-api" ./freyja-api {};
      # http-media is broken because its tests dont build.
      http-media = lib.dontCheck superHS.http-media;
    });
  };
  
 pkgOverlay = self: super: {
   haskell = super.haskell // {
     packages = super.haskell.packages // {
       ${compiler} = super.haskell.packages.${compiler}.override (makeHsOverrides super.haskell.lib);
     };
   };
  };
            
  exe = extendedPkgs.haskell.packages.${compiler}.freyja;
in
{
  inherit exe;
}