modules/lazyload: warn enabling a lazy loading provider

Author: khaneliman

modules/lazyload.nix

@@ -26,5 +26,33 @@ in
           '';
         }
       ];
+    warnings =
+      let
+        ignoredPackages = [
+          # removed
+          "treesitter-playground"
+          # renamed
+          "surround"
+          "null-ls"
+          "wilder-nvim"
+        ];
+
+        pluginsWithLazyLoad = builtins.filter (
+          x:
+          !(lib.elem x ignoredPackages)
+          && lib.hasAttr "lazyLoad" config.plugins.${x}
+          && config.plugins.${x}.lazyLoad.enable
+        ) (builtins.attrNames config.plugins);
+        count = builtins.length pluginsWithLazyLoad;
+      in
+      lib.optionals (count > 0 && !config.plugins.lz-n.enable) [
+        ''
+          You have enabled lazy loading support for the following plugins but have not enabled a lazy loading provider.
+            ${lib.concatImapStringsSep "\n" (i: x: "${toString i}. plugins.${x}") pluginsWithLazyLoad}
+
+          Currently supported lazy providers:
+            - lz-n
+        ''
+      ];
   };
 }