{ lib, config, ... }:

let cfg = config.this.overlays;
    overlay = ov:
      lib.optional cfg."${ov}".enable
        (import ./${ov}.nix);
in
{
  options = {
    this.overlays.emacs.enable = lib.mkEnableOption "custom-built Emacs overlay";
    this.overlays.g45_h264.enable = lib.mkEnableOption "intel-vaapi-driver with h264 support on gm45";
  };

  config.nixpkgs.overlays =
    (overlay "emacs") ++
    (overlay "g45_h264");
}