From 68966f414cab552efaf854300d25839b5dbca87e Mon Sep 17 00:00:00 2001
From: Ian Mackinnon <imackinnon@gmail.com>
Date: Fri, 19 Oct 2012 17:12:07 +0200
Subject: [PATCH] Better header error reporting.

---
 Makefile | 2 ++
 ale.py   | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7fc9946..1daecae 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,8 @@ all :
 package : ale.py MANIFEST.in README.md setup.py
 	python setup.py sdist
 
+dist/ALE-0.1dev.tar.gz : package
+
 install : dist/ALE-0.1dev.tar.gz
 	sudo pip install dist/ALE-0.1dev.tar.gz
 
diff --git a/ale.py b/ale.py
index b7c332c..374fb84 100644
--- a/ale.py
+++ b/ale.py
@@ -128,7 +128,10 @@ class ale(object):
     delim = "\t"
 
     def _read_heading(self, line):
-        key, value = line.split(self.delim)[:2]
+        try:
+            key, value = line.split(self.delim)[:2]
+        except ValueError as e:
+            raise ValueError("Expected two values separated by a tab: '%s'", repr(line))
         if not key in headings:
             raise ValueError("Unknown heading: '%s'.", key)
         heading = headings[key]