content.py

    # {{{ remove pages orphaned because of group renames

    for fpd in (
            FlowPageData.objects
            .filter(
                flow_session=flow_session,
                ordinal__isnull=False)
            .exclude(group_id__in=desc_group_ids)
            ):
        remove_page(fpd)

    # }}}

    if flow_session.page_count != ordinal[0]:
        flow_session.page_count = ordinal[0]
        flow_session.save()


def adjust_flow_session_page_data(repo, flow_session,
        course_identifier, flow_desc, commit_sha):
    from django.db import transaction
    with transaction.atomic():
        return _adjust_flow_session_page_data_inner(
                repo, flow_session, course_identifier, flow_desc, commit_sha)


def get_course_commit_sha(course, participation):
    sha = course.active_git_commit_sha

    if participation is not None and participation.preview_git_commit_sha:
        sha = participation.preview_git_commit_sha

    return sha.encode()


def list_flow_ids(repo, commit_sha):
    flow_ids = []
    try:
        flows_tree = get_repo_blob(repo, "flows", commit_sha)
    except ObjectDoesNotExist:
        # That's OK--no flows yet.
        pass
    else:
        for entry in flows_tree.items():
            if entry.path.endswith(".yml"):
                flow_ids.append(entry.path[:-4])

    return sorted(flow_ids)

# vim: foldmethod=marker