From 06b4db06f3e5c29c10953cde04bccd97f09087cd Mon Sep 17 00:00:00 2001
From: Michael Drake <michael.drake@codethink.co.uk>
Date: Wed, 18 Mar 2015 18:16:23 +0000
Subject: Make warning messages more user friendly.

Printing the file and line number of the warning's origin
makes the warning itself harder to spot, and can make it
appear as if something has actually gone wrong.

Change-Id: Ie77357d9a061d31e234e6e434521d2d274409773
---
 morphlib/app.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/morphlib/app.py b/morphlib/app.py
index b12b87de..42a346a1 100644
--- a/morphlib/app.py
+++ b/morphlib/app.py
@@ -20,6 +20,7 @@ import pipes
 import sys
 import time
 import urlparse
+import warnings
 import extensions
 
 import morphlib
@@ -213,6 +214,12 @@ class Morph(cliapp.Application):
         with morphlib.util.hide_password_environment_variables(os.environ):
             cliapp.Application.log_config(self)
 
+        def pretty_warnings(message, category, filename, lineno,
+                            file=None, line=None):
+            return 'WARNING: %s' % (message)
+
+        warnings.formatwarning = pretty_warnings
+
     def process_args(self, args):
         self.check_time()
 
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