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

Signed-off-by: saygo-png <saygo.mail@proton.me>

Author: saygo-png

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

@@ -1,5 +1,7 @@
 {
   lib,
+  config,
+  options,
   ...
 }:
 lib.nixvim.plugins.mkVimPlugin {
@@ -9,6 +11,32 @@ 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.join ", " (
+            map (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 = [ { } ];
   };