# HG changeset patch
# User Ross Lagerwall <rosslagerwall@gmail.com>
# Date 2012-08-04 12:37:17
# Node ID 39c01f8e7b39d986923b5445c1a51e323221bc75
# Parent  ba36e771f268f556fd0a4d93a95479dba0dd1ed7

templater: handle a missing value correctly

Before, using a broken style such as:
changeset =
would result in a traceback.

This fixes a regression introduced in 63c47e4ac617.

diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -295,6 +295,8 @@ class templater(object):
         conf.read(mapfile)
 
         for key, val in conf[''].items():
+            if not val:
+                raise SyntaxError(_('%s: missing value') % conf.source('', key))
             if val[0] in "'\"":
                 try:
                     self.cache[key] = parsestring(val)
diff --git a/tests/test-command-template.t b/tests/test-command-template.t
--- a/tests/test-command-template.t
+++ b/tests/test-command-template.t
@@ -463,6 +463,13 @@ Error if style missing key:
   abort: "changeset" not in template map
   [255]
 
+Error if style missing value:
+
+  $ echo 'changeset =' > t
+  $ hg log --style t
+  abort: t:1: missing value
+  [255]
+
 Error if include fails:
 
   $ echo 'changeset = q' >> t