templater: abort when a template filter raises an exception (issue2987)

templater: abort when a template filter raises an exception (issue2987)

--- a/mercurial/templater.py	Sat Aug 11 12:45:53 2012 -0500
+++ b/mercurial/templater.py	Fri Aug 17 15:12:01 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)

--- a/tests/test-command-template.t	Sat Aug 11 12:45:53 2012 -0500
+++ b/tests/test-command-template.t	Fri Aug 17 15:12:01 2012 -0700
@@ -1255,6 +1255,30 @@
   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 ..