Modularize nixos and home-manager packages

modules/programs/layout.nix

@@ -0,0 +1,23 @@
+{ lib, options, config, ... }: {
+  options.mods.xkb = {
+    layout = lib.mkOption {
+      default = "dashie";
+      example = "us";
+      type = lib.types.str;
+      description = "Your layout";
+    };
+    variant = lib.mkOption {
+      default = "";
+      example = "";
+      type = lib.types.str;
+      description = "Your variant";
+    };
+  };
+  config = (lib.optionalAttrs (options?services.xserver) {
+    # Configure keymap in X11
+    services.xserver = {
+      xkb.layout = "${config.mods.xkb.layout}";
+      xkb.variant = "${config.mods.xkb.variant}";
+    };
+  });
+}