From b920776e3cf7bc773ddf8edfd3563e8a4af09769 Mon Sep 17 00:00:00 2001
From: TylerCG <117808427+TylerCG@users.noreply.github.com>
Date: Sat, 13 Sep 2025 22:39:13 -0400
Subject: [PATCH] Update main.py

---
 main.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/main.py b/main.py
index 4c26d77..c81d621 100644
--- a/main.py
+++ b/main.py
@@ -102,6 +102,10 @@ print(f"\nSelected {len(selected)} file(s):")
 for s in selected:
     print("  ", s)
 
+# enforce minimum 2 files if --all was used
+if args.all and len(selected) < 2:
+    print("⚠️ --all requires at least 2 .m4b files to merge.")
+    sys.exit(1)
 # final output name
 if args.output:
     final_name = args.output.strip()