Added feed configurations for django.contrib.comments

from django.conf import settings

from django.contrib.syndication.feeds import Feed

from django.core.exceptions import ObjectDoesNotExist

from django.models.core import sites

from django.models.comments import comments, freecomments

class LatestFreeCommentsFeed(Feed):

    """Feed of latest comments on the current site"""

    comments_module = freecomments

    def title(self):

        if not hasattr(self, '_site'):

            self._site = sites.get_current()

        return "%s comments" % self._site.name

    def link(self):

        if not hasattr(self, '_site'):

            self._site = sites.get_current()

        return "http://%s/" % (self._site.domain)

    def description(self):

        if not hasattr(self, '_site'):

            self._site = sites.get_current()

        return "Latest comments on %s" % self._site.name

    def items(self):

        return self.comments_module.get_list(**self._get_lookup_kwargs())

    def _get_lookup_kwargs(self):

        return {

            'site__pk' : settings.SITE_ID,

            'is_public__exact' : True,

            'limit' : 40,

        }

class LatestCommentsFeed(LatestFreeCommentsFeed):

    """Feed of latest free comments on the current site"""

    comments_module = comments

    def _get_lookup_kwargs(self):

        kwargs = LatestFreeCommentsFeed._get_lookup_kwargs(self)

        kwargs['is_removed__exact'] = False

        if settings.COMMENTS_BANNED_USERS_GROUP:

            kwargs['where'] = ['user_id NOT IN (SELECT user_id FROM auth_users_group WHERE group_id = %s)']

            kwargs['params'] = [COMMENTS_BANNED_USERS_GROUP]

        return kwargs

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