From 25adb8e7568b748a08f3106fcd30ac81e8cf0d6f Mon Sep 17 00:00:00 2001
From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Thu, 27 Aug 2009 13:03:39 +0200
Subject: [PATCH] Make pret-trans complain on invalid input.

Before, the lua would just crash with a vague error.
---
 pret-trans.lua | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pret-trans.lua b/pret-trans.lua
index ac1b525..238a4e5 100644
--- a/pret-trans.lua
+++ b/pret-trans.lua
@@ -91,7 +91,11 @@ function vis.end_of_display()
             break
         end
     end
-   
+  
+    if not len then
+        error("No horizontal separator found in:\n" .. table.concat(lines, "\n"))
+    end
+
     -- Split the input in three parts. Stuff before the line, stuff
     -- after the line, stuff to the right of the line.
     before, after, rights = {}, {}, {}
-- 
2.30.2