disable modules, README, warning fixes

nix/hm-module.nix

@@ -52,6 +52,39 @@ in
       description = "nova-shell package to use.";
     };
 
+    modules = lib.mkOption {
+      description = "Enable or disable individual bar modules.";
+      default = { };
+      type = lib.types.submodule {
+        options = lib.genAttrs
+          [
+            "tray"
+            "windowTitle"
+            "clock"
+            "notifications"
+            "mpris"
+            "volume"
+            "bluetooth"
+            "backlight"
+            "network"
+            "powerProfile"
+            "idleInhibitor"
+            "weather"
+            "temperature"
+            "cpu"
+            "memory"
+            "disk"
+            "battery"
+            "wlogout"
+          ]
+          (name: lib.mkOption {
+            type = lib.types.bool;
+            default = true;
+            description = "Enable the ${name} module.";
+          });
+      };
+    };
+
     theme = lib.mkOption {
       type = lib.types.attrsOf lib.types.anything;
       default = { };
@@ -80,10 +113,15 @@ in
   config = lib.mkIf cfg.enable {
     programs.nova-shell.theme = lib.mkIf stylixAvailable (lib.mkDefault stylixTheme);
 
-    home.packages = [
-      self.packages.${pkgs.stdenv.hostPlatform.system}.nova-shell-cli
-      pkgs.nerd-fonts.symbols-only
-    ];
+    home.packages =
+      [
+        self.packages.${pkgs.stdenv.hostPlatform.system}.nova-shell-cli
+        pkgs.nerd-fonts.symbols-only
+      ]
+      ++ lib.optional cfg.modules.weather pkgs.wttrbar;
+
+    xdg.configFile."nova-shell/modules.json".source =
+      (pkgs.formats.json { }).generate "nova-shell-modules.json" cfg.modules;
 
     xdg.configFile."nova-shell/theme.json".source =
       (pkgs.formats.json { }).generate "nova-shell-theme.json"