Allow extracting WAD/U8 files to an existing empty directory

modules/u8.py

@@ -30,12 +30,8 @@ def handle_u8(args):
 
         u8_data = open(input_path, "rb").read()
 
-        # Ensure the output directory doesn't already exist, because libWiiPy wants to create a new one to ensure that
-        # the contents of the U8 archive are extracted correctly.
-        if output_path.exists():
-            print("Error: Specified output directory already exists!")
-            return
-
+        # Output path is deliberately not checked in any way because libWiiPy already has those checks, and it's easier
+        # and cleaner to only have one component doing all the checks.
         libWiiPy.archive.extract_u8(u8_data, str(output_path))
 
         print("U8 archive unpacked!")

modules/wad.py

@@ -1,6 +1,7 @@
 # "wad.py" from WiiPy by NinjaCheetah
 # https://github.com/NinjaCheetah/WiiPy
 
+import os
 import pathlib
 import binascii
 import libWiiPy
@@ -89,8 +90,14 @@ def handle_wad(args):
     elif args.unpack:
         if not input_path.exists():
             raise FileNotFoundError(input_path)
-        if not output_path.is_dir():
-            output_path.mkdir()
+        # Check if the output path already exists, and if it does, ensure that it is both a directory and empty.
+        if output_path.exists():
+            if output_path.is_dir() and next(os.scandir(output_path), None):
+                raise ValueError("Output folder is not empty!")
+            elif output_path.is_file():
+                raise ValueError("A file already exists with the provided name!")
+        else:
+            os.mkdir(output_path)
 
         # Step through each component of a WAD and dump it to a file.
         with open(args.input, "rb") as wad_file: