Fix dependency resolution for plugins in buildSrc

default.nix

@@ -5,15 +5,34 @@ with pkgs;
 let
   buildGradle = pkgs.callPackage ./gradle-env.nix {};
 
-in buildGradle {
-  envSpec = ./gradle-env.json;
+  gradle2nix = buildGradle {
+    envSpec = ./gradle-env.json;
 
-  src = ./.;
+    src = lib.cleanSourceWith {
+      filter = lib.cleanSourceFilter;
+      src = lib.cleanSourceWith {
+        filter = path: type: let baseName = baseNameOf path; in !(
+          (type == "directory" && (
+            baseName == "build" ||
+            baseName == ".idea" ||
+            baseName == ".gradle"
+          )) ||
+          (lib.hasSuffix ".iml" baseName)
+        );
+        src = ./.;
+      };
+    };
 
-  gradleFlags = [ "installDist" ];
+    gradleFlags = [ "installDist" ];
 
-  installPhase = ''
-    mkdir -p $out
-    cp -r app/build/install/gradle2nix/* $out/
-  '';
-}
+    installPhase = ''
+      mkdir -p $out
+      cp -r app/build/install/gradle2nix/* $out/
+    '';
+
+    passthru = {
+      plugin = "${gradle2nix}/share/plugin.jar";
+    };
+  };
+
+in gradle2nix