plugins/friendly-snippets: add warning when using performance.combinePlugins

plugins/by-name/friendly-snippets/default.nix

@@ -1,5 +1,7 @@
 {
   lib,
+  config,
+  options,
   ...
 }:
 lib.nixvim.plugins.mkVimPlugin {
@@ -9,6 +11,30 @@ lib.nixvim.plugins.mkVimPlugin {
   maintainers = [ lib.maintainers.GaetanLepage ];
 
   extraConfig = {
+    warnings = lib.nixvim.mkWarnings "plugins.friendly-snippets" (
+      let
+        snippetConsumers = map (lib.splitString ".") [
+          "plugins.luasnip.enable"
+          "plugins.cmp.enable"
+          "plugins.blink-cmp.enable"
+          "plugins.nvim-snippets.enable"
+        ];
+        enabledConsumers = builtins.filter (path: lib.getAttrFromPath path config) snippetConsumers;
+        enabledConsumersPretty = lib.concatMapStringsSep ", " (
+          path: lib.getAttrFromPath path options
+        ) enabledConsumers;
+      in
+      {
+        when =
+          config.performance.combinePlugins.enable
+          && !(builtins.elem "friendly-snippets" config.performance.combinePlugins.standalonePlugins)
+          && (enabledConsumers != [ ]);
+        message = ''
+          When using ${options.performance.combinePlugins.enable}, ${options.plugins.friendly-snippets.enable} and ${enabledConsumersPretty}:
+          "friendly-snippets" has to be added to ${options.performance.combinePlugins.standalonePlugins} in order to be picked up by the aforementioned plugins.
+        '';
+      }
+    );
     # Simply add an element to the `fromVscode` list to trigger the import of friendly-snippets
     plugins.luasnip.fromVscode = [ { } ];
   };