from django.contrib.auth.models import User
from django.db.models import Q

def format_username(firstname, lastname):
    first = firstname.lower().strip().replace(" ", "")[:6].encode('ascii', 'ignore')
    last = lastname.lower().strip().replace(" ", "")[:6].encode('ascii', 'ignore')

    return "{0}{0}".format(first, last)

def users_with_perm(perm_name):
    return User.objects.filter(
        Q(is_superuser=True) |
        Q(user_permissions__codename=perm_name) |
        Q(groups__permissions__codename=perm_name)).distinct()