# Pastebin kQpe5V8b
  eval-nix =
    let
      pkgs = 
        import ../nix/pkgs {};

      nix-files =
        builtins.filterSource 
          ( name: type: 
              type == "directory" 
                || pkgs.lib.hasPrefix ".nix" (baseNameOf (toString name))
          )
          ./..;
    in
    pkgs.runCommand "eval-nix" {}
      ''
      find ${nix-files} -name '*.nix' -type f -print0 | xargs -0 ${pkgs.nix}/bin/nix-instantiate --eval-only
      '';