remove unloaded apps from code path

apps/language_server/lib/language_server/build.ex

@@ -297,7 +297,6 @@ defmodule ElixirLS.LanguageServer.Build do
   end
 
   defp purge_app(app) do
-    # TODO use hack with ets
     modules =
       case :application.get_key(app, :modules) do
         {:ok, modules} -> modules
@@ -314,12 +313,27 @@ defmodule ElixirLS.LanguageServer.Build do
     case Application.stop(app) do
       :ok -> :ok
       {:error, :not_started} -> :ok
-      {:error, error} -> Logger.error("Application.stop failed for #{app}: #{inspect(error)}")
+      {:error, error} -> Logger.warning("Application.stop failed for #{app}: #{inspect(error)}")
     end
 
+    lib_dir = :code.lib_dir(app)
+
     case Application.unload(app) do
       :ok -> :ok
-      {:error, error} -> Logger.error("Application.unload failed for #{app}: #{inspect(error)}")
+      {:error, error} -> Logger.warning("Application.unload failed for #{app}: #{inspect(error)}")
+    end
+
+    if is_list(lib_dir) do
+      case :code.del_path(:filename.join(lib_dir, ~c"ebin")) do
+        true ->
+          :ok
+
+        false ->
+          :ok
+
+        {:error, reason} ->
+          Logger.warning("Unable to clean code path for #{app}: #{inspect(reason)}")
+      end
     end
   end