def format_repo(repo):
    """
    Return a dictionary representing the repository

    It returns ``None`` for things we do not support or are not
    relevant.

    :param str repo_name:
        The name of the repository.
    :param git.Repo repo:
        The repository object.
    :param str base_url:
        The base URL for the repository's links.
    :returns: dict

    """
    commit = repo.commit()
    return {
        'name': os.path.basename(repo.working_dir),
        'branch': repo.active_branch.name,
        'commit': commit.hexsha,
        'timestamp': datetime.fromtimestamp(
            commit.committed_date).isoformat(),
        'author': '%s <%s>' % (commit.author.name, commit.author.email),
        'schemas': list_schemas(repo)
    }