tree-sitter: Add withPlugins

pkgs/development/tools/parsing/tree-sitter/default.nix

···
     in
     lib.mapAttrs change grammars;
 
+  # Usage:
+  # pkgs.tree-sitter.withPlugins (p: [ p.tree-sitter-c p.tree-sitter-java ... ])
+  #
+  # or for all grammars:
+  # pkgs.tree-sitter.withPlugins (_: allGrammars)
+  # which is equivalent to
+  # pkgs.tree-sitter.withPlugins (p: builtins.attrValues p)
+  withPlugins = grammarFn:
+    let
+      grammars = grammarFn builtGrammars;
+    in
+    linkFarm "grammars"
+      (map
+        (drv:
+          let
+            name = lib.strings.getName drv;
+          in
+          {
+            name =
+              (lib.strings.removePrefix "tree-sitter-"
+                (lib.strings.removeSuffix "-grammar" name))
+              + stdenv.hostPlatform.extensions.sharedLibrary;
+            path = "${drv}/parser";
+          }
+        )
+        grammars);
+
+  allGrammars = builtins.attrValues builtGrammars;
+
 in
 rustPlatform.buildRustPackage {
   pname = "tree-sitter";
···
     updater = {
       inherit update-all-grammars;
     };
-    inherit grammars builtGrammars;
+    inherit grammars builtGrammars withPlugins allGrammars;
 
     tests = {
       # make sure all grammars build

pkgs/misc/vim-plugins/overrides.nix

···
 , CoreFoundation
 , CoreServices
 
+# nvim-treesitter dependencies
+, tree-sitter
+
   # sved dependencies
 , glib
 , gobject-introspection
···
 
   nvim-lsputils = super.nvim-lsputils.overrideAttrs (old: {
     dependencies = with super; [ popfix ];
+  });
+
+  # Usage:
+  # pkgs.vimPlugins.nvim-treesitter.withPlugins (p: [ p.tree-sitter-c p.tree-sitter-java ... ])
+  # or for all grammars:
+  # pkgs.vimPlugins.nvim-treesitter.withPlugins (_: tree-sitter.allGrammars)
+  nvim-treesitter = super.nvim-treesitter.overrideAttrs (old: {
+    passthru.withPlugins =
+      grammarFn: self.nvim-treesitter.overrideAttrs (_: {
+        postPatch =
+          let
+            grammars = tree-sitter.withPlugins grammarFn;
+          in
+          ''
+            rm -r parser
+            ln -s ${grammars} parser
+          '';
+      });
   });
 
   onehalf = super.onehalf.overrideAttrs (old: {