diff --git a/vimtabdiff.py b/vimtabdiff.py
index dc07043..1e961d0 100755
--- a/vimtabdiff.py
+++ b/vimtabdiff.py
@@ -4,7 +4,8 @@ import os,sys
 import argparse
 import pathlib
 import itertools
-from pathlib import Path
+import tempfile
+import subprocess
 
 def parse_args():
     parser = argparse.ArgumentParser(description="Show diff in vim tab pages")
@@ -12,11 +13,12 @@ def parse_args():
     parser.add_argument("pathB")
     return parser.parse_args()
 
-def get_dir_info(dirname: Path):
+def get_dir_info(dirname):
     if not dirname:
         return [],[]
     dirs, files = [], []
-    for p in dirname.iterdir():
+    dirp = pathlib.Path(dirname)
+    for p in dirp.iterdir():
         if p.is_dir():
             dirs.append(p)
         else:
@@ -26,14 +28,14 @@ def get_dir_info(dirname: Path):
 def get_pairs(aItems, bItems):
     aItems = [(item, 'A') for item in aItems]
     bItems = [(item, 'B') for item in bItems]
-    items = sorted(aItems + bItems)
-    for _, items in itertools.groupby(items, lambda item: item[0].name):
+    abItems = aItems + bItems
+    abItems.sort(key= lambda item: (item[0].name, item[1]))
+    for _, items in itertools.groupby(abItems, lambda item: item[0].name):
         items = list(items)
         if len(items) == 2:
             (aItem, _), (bItem, _) = items
             yield aItem, bItem
         else:
-            assert(len(items) == 1)
             (item, tag), = items
             if tag == 'A':
                 yield item, None
@@ -41,8 +43,8 @@ def get_pairs(aItems, bItems):
                 yield None, item
 
 def get_file_pairs(a, b):
-    aDirs, aFiles = get_dir_info(Path(a))
-    bDirs, bFiles = get_dir_info(Path(b))
+    aDirs, aFiles = get_dir_info(a)
+    bDirs, bFiles = get_dir_info(b)
     yield from get_pairs(aFiles, bFiles)
     for aDir, bDir in get_pairs(aDirs, bDirs):
         yield from get_file_pairs(aDir, bDir)
@@ -50,8 +52,14 @@ def get_file_pairs(a, b):
 def main():
     args = parse_args()
     print("Helloworld")
-    for a, b in get_file_pairs(args.pathA, args.pathB):
-        print(f"{a=}, {b=}")
+    vimCmdFile = tempfile.NamedTemporaryFile(mode='w', delete=False)
+    with vimCmdFile:
+        for a, b in get_file_pairs(args.pathA, args.pathB):
+            aPath = str(a) if a else "/dev/null"
+            bPath = str(b) if b else "/dev/null"
+            print(f"tabedit {aPath} | diffthis | vsp {bPath} | diffthis", file=vimCmdFile)
+        print(f"""call delete("{vimCmdFile.name}")""", file=vimCmdFile)
+    subprocess.run(["vim", "-S", vimCmdFile.name])
 
 if __name__ == '__main__':
     main()