def _extract_user_from_git_blame_info(info):
    """As this tool is meant to be used in an enterprise setting, we assume
    that the email address of the committer uniquely identifies a given user.

    This function extracts that information.
    """
    info = info.split()
    index_of_mail = info.index('author-mail')
    email = info[index_of_mail + 1]
    index_of_at_symbol = email.index('@')
    return email[1:index_of_at_symbol]
