neovim wrapper: add withNodeJs to build wrapper with nodejs support

pkgs/applications/editors/neovim/wrapper.nix

@@ -1,6 +1,8 @@
 { stdenv, lib, makeWrapper
 , vimUtils
 , bundlerEnv, ruby
+, nodejs
+, nodePackages
 , pythonPackages
 , python3Packages
 }:
@@ -12,6 +14,7 @@ let
   wrapper = {
       withPython ? true,  extraPythonPackages ? (_: []) /* the function you would have passed to python.withPackages */
     , withPython3 ? true,  extraPython3Packages ? (_: []) /* the function you would have passed to python.withPackages */
+    , withNodeJs? false
     , withRuby ? true
     , withPyGUI ? false
     , vimAlias ? false
@@ -50,6 +53,8 @@ let
         ++ (extraPython3PackagesFun ps)
         ++ (concatMap (f: f ps) pluginPython3Packages));
 
+  binPath = makeBinPath (optionals withRuby [rubyEnv] ++ optionals withNodeJs [nodejs]);
+
   in
   stdenv.mkDerivation {
       name = "neovim-${stdenv.lib.getVersion neovim}";
@@ -62,10 +67,12 @@ let
 
         makeWrapper "$(readlink -v --canonicalize-existing "${bin}")" \
           "$out/bin/nvim" --add-flags " \
+        --cmd \"${if withNodeJs then "let g:node_host_prog='${nodePackages.neovim}/bin/neovim-node-host'" else "let g:loaded_node_provider=1"}\" \
         --cmd \"${if withPython then "let g:python_host_prog='$out/bin/nvim-python'" else "let g:loaded_python_provider = 1"}\" \
         --cmd \"${if withPython3 then "let g:python3_host_prog='$out/bin/nvim-python3'" else "let g:loaded_python3_provider = 1"}\" \
         --cmd \"${if withRuby then "let g:ruby_host_prog='$out/bin/nvim-ruby'" else "let g:loaded_ruby_provider=1"}\" " \
-         ${optionalString withRuby '' --suffix PATH : ${rubyEnv}/bin --set GEM_HOME ${rubyEnv}/${rubyEnv.ruby.gemPath}'' }
+        --suffix PATH : ${binPath} \
+        ${optionalString withRuby '' --set GEM_HOME ${rubyEnv}/${rubyEnv.ruby.gemPath}'' }
 
       ''
       + optionalString (!stdenv.isDarwin) ''