Added shallow diff option

DataPuller.py

@@ -30,6 +30,12 @@ parser.add_argument(
     action="store_true",
     help="List affected files without copying or deleting",
 )
+parser.add_argument(
+    "-s",
+    "--shallow-diff",
+    action="store_true",
+    help="Use filecmp.cmp() shallow mode for file diff (faster, but might miss changes or generate false positives)",
+)
 
 args = parser.parse_args()
 
@@ -58,7 +64,7 @@ def get_files(path):
 
 
 def main():
-    startstring = " FOLDER-SYNC 1.0 "
+    startstring = " FOLDER-SYNC 0.1.3 "
     if not args.quiet:
         print(
             len(startstring) * "=" + "\n" + startstring + "\n" + len(startstring) * "="
@@ -90,7 +96,11 @@ def main():
     for path in source:
         if path not in target:
             new.append(path)
-        elif not filecmp.cmp(os.path.join(inpath, path), os.path.join(outpath, path)):
+        elif not filecmp.cmp(
+            os.path.join(inpath, path),
+            os.path.join(outpath, path),
+            shallow=args.shallow_diff,
+        ):
             changed.append(path)
 
     # Check for file deletions