utility/images/image-nvim: add assertion for ueberzug backend on da…

…rwin

configuration.nix

@@ -180,7 +180,7 @@ inputs: let
         };
 
         images = {
-          image-nvim.enable = true;
+          image-nvim.enable = false;
         };
       };
 

modules/utility/images/image-nvim/config.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   ...
 }: let
   inherit (lib.modules) mkIf;
@@ -10,6 +11,13 @@
   cfg = config.vim.utility.images.image-nvim;
 in {
   config = mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = pkgs.stdenv.isDarwin && cfg.setupOpts.backend != "ueberzug";
+        message = "image-nvim: ueberzug backend is broken on ${pkgs.stdenv.hostPlatform.system}. if you are using kitty, please set `vim.utility.images.image-nvim.setupOpts.backend` option to `kitty` in your configuration, otherwise disable this module.";
+      }
+    ];
+
     vim = {
       startPlugins = [
         "image-nvim"