From 8b38af9e095cf6fc30159bf86be39cf122b69680 Mon Sep 17 00:00:00 2001
From: "uni@bor.mac" <j.w.dorn@gmx.at>
Date: Mon, 9 Jun 2025 14:56:00 +0200
Subject: [PATCH] pdf2book.py -z: add check for input pdf page number

---
 pdf2book.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pdf2book.py b/pdf2book.py
index d21ade8..57595b8 100755
--- a/pdf2book.py
+++ b/pdf2book.py
@@ -202,6 +202,9 @@ def make_zine(reader, lst):
     
 lst=get_reorder(number_of_pages, signature_size)
 if args.zine :
+    if number_of_pages != 16:
+        print("Error... when using '--zine' the input pdf must have 16 pages!")
+        exit(1)
     writer=make_zine(reader, lst)
 #    signature_size=zine
     outfile=args.pdf_file.split(".pdf")[0]+"_zine.pdf"