plugins/nvim-treesitter: add extraQueries

modules/plugins/style/nvim-treesitter.nix

@@ -34,6 +34,15 @@ let
               fi
             ''
           ))
+          ++ (lib.flip lib.mapAttrsToList cfg.extraQueries (
+            lang:
+            lib.mapAttrsToList (queryKind: queries:
+              ''
+                mkdir -p queries/${lang}
+                echo "${queries}" >> queries/${lang}/${queryKind}.scm
+              ''
+            )
+          ))
         );
       });
 in
@@ -62,6 +71,18 @@ in
       default = { };
     };
 
+    extraQueries = mkOption {
+      type = with types; attrsOf (submodule {
+        injections = mkOption {
+          type = either str (arrayOf str);
+          default = [ ];
+        };
+      });
+      example = {
+        javascript.injections = ''(comment) @comment'';
+      };
+    };
+
     settings = mkOption {
       type = types.attrs;
       default = { };