threading = ['%s-rev-%s@%s' % (repo.repo_name, revision, webutils.canonical_hostname())]

            if line_no: # TODO: url to file _and_ line number

                threading.append('%s-rev-%s-line-%s@%s' % (repo.repo_name, revision, line_no,

                                                           webutils.canonical_hostname()))

            comment_url = webutils.canonical_url('changeset_home',

                repo_name=repo.repo_name,

                revision=revision,

                anchor='comment-%s' % comment.comment_id)

            # get the current participants of this changeset

            recipients = _list_changeset_commenters(revision)

            # add changeset author if it's known locally

            cs_author = db.User.get_from_cs_author(cs.author)

            if not cs_author:

                # use repo owner if we cannot extract the author correctly

                # FIXME: just use committer name even if not a user

                cs_author = repo.owner

            recipients.append(cs_author)

            email_kwargs = {

                'status_change': status_change,

                'cs_comment_user': author.full_name_and_username,

                'cs_target_repo': webutils.canonical_url('summary_home', repo_name=repo.repo_name),

                'cs_comment_url': comment_url,

                'cs_url': webutils.canonical_url('changeset_home', repo_name=repo.repo_name, revision=revision),

                'message': cs.message,

                'message_short': shorter(cs.message, 50, firstline=True),

                'cs_author': cs_author,

                'cs_author_username': cs_author.username,

                'repo_name': repo.repo_name,

                'short_id': revision[:12],

                'branch': cs.branch,

                'threading': threading,

            }

        # pull request

        elif pull_request:

            notification_type = notification.NotificationModel.TYPE_PULL_REQUEST_COMMENT

            _org_ref_type, org_ref_name, _org_rev = comment.pull_request.org_ref.split(':')

            _other_ref_type, other_ref_name, _other_rev = comment.pull_request.other_ref.split(':')

            threading = ['%s-pr-%s@%s' % (pull_request.other_repo.repo_name,

                                          pull_request.pull_request_id,

                                          webutils.canonical_hostname())]

            if line_no: # TODO: url to file _and_ line number

                threading.append('%s-pr-%s-line-%s@%s' % (pull_request.other_repo.repo_name,

                                                          pull_request.pull_request_id, line_no,

                                                          webutils.canonical_hostname()))

            comment_url = pull_request.url(canonical=True,

                anchor='comment-%s' % comment.comment_id)

            # get the current participants of this pull request

            recipients = _list_pull_request_commenters(pull_request)

            recipients.append(pull_request.owner)

            recipients += pull_request.get_reviewer_users()

            # set some variables for email notification

            email_kwargs = {

                'pr_title': pull_request.title,

                'pr_title_short': shorter(pull_request.title, 50),

                'pr_nice_id': pull_request.nice_id(),

                'status_change': status_change,

                'closing_pr': closing_pr,

                'pr_comment_url': comment_url,

                'pr_url': pull_request.url(canonical=True),

                'pr_comment_user': author.full_name_and_username,

                'pr_target_repo': webutils.canonical_url('summary_home',

                                   repo_name=pull_request.other_repo.repo_name),

                'pr_target_branch': other_ref_name,

                'pr_source_repo': webutils.canonical_url('summary_home',

                                   repo_name=pull_request.org_repo.repo_name),

                'pr_source_branch': org_ref_name,

                'pr_owner': pull_request.owner,

                'pr_owner_username': pull_request.owner.username,

                'repo_name': pull_request.other_repo.repo_name,

                'threading': threading,

            }

        email_kwargs['is_mention'] = False

        # create notification objects, and emails

        notification.NotificationModel().create(

            created_by=author, body=comment_text,

            recipients=recipients, type_=notification_type,

            email_kwargs=email_kwargs,

        )

        mention_recipients = extract_mentioned_users(comment_text).difference(recipients)

        if mention_recipients:

            email_kwargs['is_mention'] = True

            notification.NotificationModel().create(

                created_by=author, body=comment_text,

                recipients=mention_recipients,

                type_=notification_type,

                email_kwargs=email_kwargs

            )

    def create(self, text, repo, author, revision=None, pull_request=None,

               f_path=None, line_no=None, status_change=None, closing_pr=False,