Moved philo files into a philo subdirectory and added a setup.py file. Philo can...

[philo.git] / philo / templatetags / collections.py

diff --git a/philo/templatetags/collections.py b/philo/templatetags/collections.py
new file mode 100644 (file)
index 0000000..38b3f91
--- /dev/null
+++ b/philo/templatetags/collections.py
@@ -0,0 +1,51 @@
+from django import template
+from django.conf import settings
+from django.contrib.contenttypes.models import ContentType
+
+
+register = template.Library()
+
+
+class MembersofNode(template.Node):
+       def __init__(self, collection, model, as_var):
+               self.collection = template.Variable(collection)
+               self.model = model
+               self.as_var = as_var
+               
+       def render(self, context):
+               try:
+                       collection = self.collection.resolve(context)
+                       context[self.as_var] = collection.members.with_model(self.model)
+               except:
+                       pass
+               return ''
+
+
+def do_membersof(parser, token):
+       """
+       {% membersof <collection> with <app_label>.<model_name> as <var> %}
+       """
+       params=token.split_contents()
+       tag = params[0]
+       
+       if len(params) < 6:
+               raise template.TemplateSyntaxError('"%s" template tag requires six parameters' % tag)
+               
+       if params[2] != 'with':
+               raise template.TemplateSyntaxError('"%s" template tag requires the third parameter to be "with"' % tag)
+       
+       try:
+               app_label, model = params[3].strip('"').split('.')
+               ct = ContentType.objects.get(app_label=app_label, model=model)
+       except ValueError:
+               raise template.TemplateSyntaxError('"%s" template tag option "with" requires an argument of the form app_label.model (see django.contrib.contenttypes)' % tag)
+       except ContentType.DoesNotExist:
+               raise template.TemplateSyntaxError('"%s" template tag option "with" requires an argument of the form app_label.model which refers to an installed content type (see django.contrib.contenttypes)' % tag)
+               
+       if params[4] != 'as':
+               raise template.TemplateSyntaxError('"%s" template tag requires the fifth parameter to be "as"' % tag)
+       
+       return MembersofNode(collection=params[1], model=ct.model_class(), as_var=params[5])
+
+
+register.tag('membersof', do_membersof)
\ No newline at end of file