nixfiles/modules/trayscale.nix

{
  config,
  lib,
  pkgs,
  ...
}:
with lib; let
  cfg = config.services.trayscale;
in {
  options.services.trayscale = {
    enable =
      mkEnableOption
      "An unofficial GUI wrapper around the Tailscale CLI client.";
    package = mkPackageOption pkgs "trayscale" {};
    hideWindow = mkOption {
      description = "Whether to hide the trayscale window on startup.";
      type = types.bool;
      default = true;
    };
  };

  config = mkIf cfg.enable {
    assertions = [
      (hm.assertions.assertPlatform "services.trayscale" pkgs platforms.linux)
    ];

    systemd.user.services.trayscale = {
      Unit = {
        Description = "An unofficial GUI wrapper around the Tailscale CLI client";
        Requires = ["tray.target"];
        After = ["graphical-session-pre.target" "tray.target" "tailscaled.service"];
        PartOf = ["graphical-session.target"];
      };
      Install = {WantedBy = ["graphical-session.target"];};
      Service.ExecStart =
        toString (["${cfg.package}/bin/trayscale"]
          ++ optional cfg.hideWindow "--hide-window");
    };
  };
}