vapoursynth-editor: allow adding plugins without rebuilding

pkgs/development/libraries/vapoursynth/editor.nix

@@ -1,9 +1,10 @@
-{ lib, mkDerivation, fetchFromBitbucket
+{ lib, stdenv, mkDerivation, fetchFromBitbucket, makeWrapper, runCommand
 , python3, vapoursynth
 , qmake, qtbase, qtwebsockets
 }:
 
-mkDerivation rec {
+let
+  unwrapped = mkDerivation rec {
     pname = "vapoursynth-editor";
     version = "R19";
 
@@ -26,13 +27,12 @@ mkDerivation rec {
       mkdir -p $out/bin
       for bin in vsedit{,-job-server{,-watcher}}; do
           mv $bin $out/bin
-
+          wrapQtApp $out/bin/$bin
-        wrapQtApp $out/bin/$bin \
-            --prefix PYTHONPATH : ${vapoursynth}/${python3.sitePackages} \
-            --prefix LD_LIBRARY_PATH : ${vapoursynth}/lib
       done
     '';
 
+    passthru = { inherit withPlugins; };
+
     meta = with lib; {
       description = "Cross-platform editor for VapourSynth scripts";
       homepage = "https://bitbucket.org/mystery_keeper/vapoursynth-editor";
@@ -40,4 +40,20 @@ mkDerivation rec {
       maintainers = with maintainers; [ tadeokondrak ];
       platforms = platforms.all;
     };
-}
+  };
+
+  withPlugins = plugins: let
+    vapoursynthWithPlugins = vapoursynth.withPlugins plugins;
+  in runCommand "${unwrapped.name}-with-plugins" {
+    buildInputs = [ makeWrapper ];
+    passthru = { withPlugins = plugins': withPlugins (plugins ++ plugins'); };
+  } ''
+    mkdir -p $out/bin
+    for bin in vsedit{,-job-server{,-watcher}}; do
+        makeWrapper ${unwrapped}/bin/$bin $out/bin/$bin \
+            --prefix PYTHONPATH : ${vapoursynthWithPlugins}/${python3.sitePackages} \
+            --prefix LD_LIBRARY_PATH : ${vapoursynthWithPlugins}/lib
+    done
+  '';
+in
+  withPlugins []