vgaswitcheroo.nix

{config, options, lib, pkgs, ...}:

with lib;

let
  cfg = config.services.vgaswitcheroo;
in {
  options.services.vgaswitcheroo = with types; {
    enable = mkOption {
      type = bool;
      default = false;
      description = ''
        Enable vgaswitcheroo.
      '';
    };
  };

  config = mkIf cfg.enable {
    systemd.services.vgaswitcheroo = {
      wantedBy = [ "multi-user.target" ];
      description = "Deactivate the discrete GPU on boot";
      serviceConfig = {
        Type = "oneshot";
        RemainAfterExit = "yes";
        ExecStart = "";
        ExecStop = "";
      };
    };
  };
}

# ...
with lib;

let

  vgaswitcheroo = pkgs.stdenv.mkDerivation {
    name = "vgaswitcheroo";
    src = pkgs.fetchFromGitHub {
      owner = "...";
      repo = "...";
      rev = "...";
      sha256 = "...";
    };
    
    buildInputs = with pkgs; [
      # ...
    ];
  };
  cfg = config.services.vgaswitcheroo;
in {
# ...
    ExecStart = "${vgaswitcheroo}/bin/foobar --some --arguments";