# HG changeset patch
# User Bryan O'Sullivan <bryano@fb.com>
# Date 1345579976 25200
# Node ID 4b87d947c4e176992947256cdbe8e83cb0b8c1ea
# Parent  a0cf8f4cd38ba8c35132379b680ebf6d0e900e3d# Parent  099c778ceb33e26626fdc27eae362113b8894491
Merge

diff -r a0cf8f4cd38b -r 4b87d947c4e1 mercurial/templater.py
--- a/mercurial/templater.py	Tue Aug 21 12:27:57 2012 -0500
+++ b/mercurial/templater.py	Tue Aug 21 13:12:56 2012 -0700
@@ -146,7 +146,15 @@
 
 def runfilter(context, mapping, data):
     func, data, filt = data
-    return filt(func(context, mapping, data))
+    try:
+        return filt(func(context, mapping, data))
+    except (ValueError, AttributeError, TypeError):
+        if isinstance(data, tuple):
+            dt = data[1]
+        else:
+            dt = data
+        raise util.Abort(_("template filter '%s' is not compatible with "
+                           "keyword '%s'") % (filt.func_name, dt))
 
 def buildmap(exp, context):
     func, data = compileexp(exp[1], context)
diff -r a0cf8f4cd38b -r 4b87d947c4e1 tests/test-command-template.t
--- a/tests/test-command-template.t	Tue Aug 21 12:27:57 2012 -0500
+++ b/tests/test-command-template.t	Tue Aug 21 13:12:56 2012 -0700
@@ -1363,6 +1363,30 @@
   abort: t:3: unmatched quotes
   [255]
 
+Behind the scenes, this will throw TypeError
+
+  $ hg log -l 3 --template '{date|obfuscate}\n'
+  abort: Template filter 'obfuscate' is not compatible with keyword 'date'
+  [255]
+
+Behind the scenes, this will throw a ValueError
+
+  $ hg log -l 3 --template 'line: {desc|shortdate}\n'
+  abort: Template filter 'shortdate' is not compatible with keyword 'desc'
+  [255]
+
+Behind the scenes, this will throw AttributeError
+
+  $ hg log -l 3 --template 'line: {date|escape}\n'
+  abort: Template filter 'escape' is not compatible with keyword 'date'
+  [255]
+
+Behind the scenes, this will throw ValueError
+
+  $ hg tip --template '{author|email|date}\n'
+  abort: Template filter 'datefilter' is not compatible with keyword 'author'
+  [255]
+
   $ cd ..