Added helpers module.

Also added a Pyramid subscriber hook to add the module to the template renderer
context with a key of `h`.  This is nothing really new, but it overrides the
helper provided by `edbob`, and adds a `pretty_date()` function (which maybe
isn't a good idea anyway..?).

rattail/pyramid/helpers.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# -*- coding: utf-8  -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2012 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU Affero General Public License as published by the Free
+#  Software Foundation, either version 3 of the License, or (at your option)
+#  any later version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for
+#  more details.
+#
+#  You should have received a copy of the GNU Affero General Public License
+#  along with Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+
+"""
+``rattail.pyramid.helpers`` -- Template Context Helpers
+"""
+
+import datetime
+from decimal import Decimal
+
+from webhelpers.html import *
+from webhelpers.html.tags import *
+
+from edbob.pyramid.forms import pretty_datetime
+
+
+def pretty_date(date):
+    return date.strftime('%a %d %b %Y')

rattail/pyramid/subscribers.py

@@ -29,6 +29,7 @@
 from pyramid import threadlocal
 
 import rattail
+from rattail.pyramid import helpers
 
 
 def before_render(event):
@@ -47,6 +48,7 @@ def before_render(event):
     request = event.get('request') or threadlocal.get_current_request()
 
     renderer_globals = event
+    renderer_globals['h'] = helpers
     renderer_globals['rattail'] = rattail