diff --git a/kiss/src/kiss/CompilerTools.hx b/kiss/src/kiss/CompilerTools.hx
index e86e00e8..3503ae23 100644
--- a/kiss/src/kiss/CompilerTools.hx
+++ b/kiss/src/kiss/CompilerTools.hx
@@ -59,9 +59,7 @@ class CompilerTools {
         // TODO this assumes the user hasn't put folders in the folder, which
         // would cause a failure because we're not deleting recursively
         if (FileSystem.exists(args.outputFolder)) {
-            for (file in FileSystem.readDirectory(args.outputFolder)) {
-                FileSystem.deleteFile(Path.join([args.outputFolder, file]));
-            }
+            Prelude.walkDirectory(null, args.outputFolder, (file) -> FileSystem.deleteFile(file), null, (folder) -> FileSystem.deleteDirectory(folder));
             FileSystem.deleteDirectory(args.outputFolder);
         }
 
@@ -148,8 +146,8 @@ class CompilerTools {
                     var envFolder = '${args.outputFolder}-env';
                     Prelude.assertProcess("python", ["-m", "venv", envFolder]);
                     var envBinDir = if (Sys.systemName() == "Windows") "Scripts" else "bin";
-                    trace(Prelude.assertProcess("ls", [envFolder]).replace("\n", " "));
-                    trace(Prelude.assertProcess("ls", [Path.join([envFolder, envBinDir])]).replace("\n", " "));
+                    // trace(Prelude.assertProcess("ls", [envFolder]).replace("\n", " "));
+                    // trace(Prelude.assertProcess("ls", [Path.join([envFolder, envBinDir])]).replace("\n", " "));
                     var envPython = Path.join([envFolder, envBinDir, "python"]);
                     command = envPython;
                     switch (args.langProjectFile.extension()) {
diff --git a/kiss/src/kiss/Prelude.hx b/kiss/src/kiss/Prelude.hx
index b38da42e..d67e214d 100644
--- a/kiss/src/kiss/Prelude.hx
+++ b/kiss/src/kiss/Prelude.hx
@@ -376,14 +376,18 @@ class Prelude {
     private static var kissProcess:Process = null;
     #end
 
-    public static function walkDirectory(basePath, directory, processFile:(String) -> Void, processSubdirectory:(String) -> Void) {
+    public static function walkDirectory(basePath, directory, processFile:(String) -> Void, ?processFolderBefore:(String) -> Void,
+            ?processFolderAfter:(String) -> Void) {
         #if (sys || hxnodejs)
         for (fileOrFolder in FileSystem.readDirectory(joinPath(basePath, directory))) {
             switch (fileOrFolder) {
                 case folder if (FileSystem.isDirectory(joinPath(basePath, directory, folder))):
                     var subdirectory = joinPath(directory, folder);
-                    processSubdirectory(subdirectory);
-                    walkDirectory(basePath, subdirectory, processFile, processSubdirectory);
+                    if (processFolderBefore != null)
+                        processFolderBefore(subdirectory);
+                    walkDirectory(basePath, subdirectory, processFile, processFolderBefore, processFolderAfter);
+                    if (processFolderAfter != null)
+                        processFolderAfter(subdirectory);
                 case file:
                     processFile(joinPath(directory, file));
             }