From eb39018d18c147a8354eb395eef25c43132157a5 Mon Sep 17 00:00:00 2001
From: Johannes 'josch' Schauer <josch@mister-muffin.de>
Date: Fri, 19 Jun 2020 16:57:41 +0200
Subject: [PATCH] raise error if none of --size, --factor or --maxpages is
 given

---
 plakativ.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/plakativ.py b/plakativ.py
index b3608ba..889ac1c 100755
--- a/plakativ.py
+++ b/plakativ.py
@@ -2125,7 +2125,12 @@ Report bugs at https://gitlab.mister-muffin.de/josch/plakativ/issues
     elif isinstance(args.mode, int):
         mode = "npages"
     else:
-        raise Exception("logic error")
+        print(
+            "Error: must supply one of --size, --factor or --maxpages\n",
+            file=sys.stderr,
+        )
+        parser.print_usage(sys.stderr)
+        sys.exit(1)
 
     compute_layout(
         args.input,