{ options, config, lib, pkgs, ... }: with lib; with lib.plusultra; let cfg = config.plusultra.apps.frappe-books; in { options.plusultra.apps.frappe-books = with types; { enable = mkBoolOpt false "Whether or not to enable FrappeBooks."; }; config = mkIf cfg.enable { environment.systemPackages = with pkgs; [ plusultra.frappe-books ]; }; }