make user option

modules/nixos/default.nix

@@ -11,6 +11,13 @@ in {
     enable = lib.mkEnableOption "my custom config";
     desktop = lib.mkEnableOption "custom config with desktop support";
     laptop = lib.mkEnableOption "extra stuff for laptops like wifi";
+    user = lib.mkOption {
+      default = "max";
+      example = "foo";
+      description = "The main user working on this machine";
+      type = lib.types.nonEmptyStr;
+      readOnly = true;
+    };
   };
 
   config.myConfig = lib.mkIf cfg.enable {

modules/nixos/music.nix

@@ -14,7 +14,7 @@ in {
       enable = true;
       rtcqs.enable = true;
     };
-    users.users.max.extraGroups = ["audio"];
+    users.users.${config.myConfig.user}.extraGroups = ["audio"];
 
     services.pipewire = {
       enable = true;

modules/nixos/sway.nix

@@ -38,7 +38,7 @@ in {
     };
 
     # make brightness keys work
-    users.users.max.extraGroups = ["video" "input"];
+    users.users.${config.myConfig.user}.extraGroups = ["video" "input"];
     programs.light.enable = lib.mkIf cfg.laptop true;
 
     # make swaylock work