text: # vim: ai ts=4 sts=4 et sw=4 encoding=utf-8
  
  from django import template
  from django.utils.safestring import mark_safe
  from django.utils.translation import ugettext_lazy as _
  
  register = template.Library()
  
  @register.filter(name='is_datasender')
  def is_datasender(user):
      groups = user.groups.all()
      return len(groups) == 1 and groups[0].name == "Data Senders"
  
  @register.filter
  def in_group(user, group):
  	"""Returns True/False if the user is in the given group(s).
  	Usage::
  		{% if user|in_group:"Friends" %}
  		or
  		{% if user|in_group:"Friends,Enemies" %}
  		...
  		{% endif %}
  	You can specify a single group or comma-delimited list.
  	"""
  	import re
  	if re.search(',', group): group_list = group.split(',')
  	elif re.search(' ', group): group_list = group.split()
  	else: group_list = [group]
  	user_groups = []
  	for group in user.groups.all(): user_groups.append(str(group.name))
  	if filter(lambda x:x in user_groups, group_list): return True
  	else: return False
  in_group.is_safe = True