nixos/neolight: init neolight

Modification to the XKB_CONFIG_ROOT environment variable required for functionnality of the package

Author: drafolin

nixos/modules/module-list.nix

@@ -1762,6 +1762,7 @@
   ./services/x11/hardware/synaptics.nix
   ./services/x11/hardware/wacom.nix
   ./services/x11/imwheel.nix
+  ./services/x11/neolight.nix
   ./services/x11/picom.nix
   ./services/x11/redshift.nix
   ./services/x11/touchegg.nix

nixos/modules/services/x11/neolight.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.services.xserver.xkb.neolight;
+in
+{
+  options.services.xserver.xkb.neolight = {
+    package = lib.mkPackageOption pkgs "neolight" { };
+    enable = lib.mkEnableOption "neolight xkb layout, extra keyboard layers for programming based on Neo";
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+    environment.sessionVariables.XKB_CONFIG_ROOT = lib.mkForce "${cfg.package}/share/X11/xkb";
+
+    assertions = [
+      {
+        assertion = config.services.xserver.xkb.extraLayouts == { };
+        message = "Neolight conflicts with xkb.extraLayouts";
+      }
+    ];
+  };
+
+  meta.maintainers = with lib.maintainers; [ drafolin ];
+}