def show_id(cs):

    """

    Configurable function that shows ID

    by default it's r123:fffeeefffeee

    :param cs: changeset instance

    """

    from kallithea import CONFIG

    def_len = safe_int(CONFIG.get('show_sha_length', 12))

    show_rev = str2bool(CONFIG.get('show_revision_number', True))

    raw_id = cs.raw_id[:def_len]

    if show_rev:

        return 'r%s:%s' % (cs.revision, raw_id)

    else:

        return '%s' % (raw_id)

def fmt_date(date):

    if date:

        _fmt = u"%a, %d %b %Y %H:%M:%S".encode('utf8')

        return date.strftime(_fmt).decode('utf8')

    return ""

def is_git(repository):

    if hasattr(repository, 'alias'):

        _type = repository.alias

    elif hasattr(repository, 'repo_type'):

        _type = repository.repo_type

    else:

        _type = repository

    return _type == 'git'

def is_hg(repository):

    if hasattr(repository, 'alias'):

        _type = repository.alias

    elif hasattr(repository, 'repo_type'):

        _type = repository.repo_type

    else:

        _type = repository

    return _type == 'hg'

def email_or_none(author):

    # extract email from the commit string

    _email = email(author)

    if _email:

        # check it against Kallithea database, and use the MAIN email for this

        # user

        user = User.get_by_email(_email, case_insensitive=True, cache=True)

        if user is not None:

            return user.email

        return _email

    # See if it contains a username we can get an email from

    user = User.get_by_username(author_name(author), case_insensitive=True,

                                cache=True)

    if user is not None:

        return user.email

    # No valid email, not a valid user in the system, none!

    return None

def person(author, show_attr="username"):

    # attr to return from fetched user

    person_getter = lambda usr: getattr(usr, show_attr)

    # if author is already an instance use it for extraction

    if isinstance(author, User):

        return person_getter(author)

    # Valid email in the attribute passed, see if they're in the system

    _email = email(author)

    if _email:

        user = User.get_by_email(_email, case_insensitive=True, cache=True)

        if user is not None:

            return person_getter(user)

    # Maybe it's a username?

    _author = author_name(author)

    user = User.get_by_username(_author, case_insensitive=True,

                                cache=True)

    if user is not None:

        return person_getter(user)

    # Still nothing?  Just pass back the author name if any, else the email

    return _author or _email

def person_by_id(id_, show_attr="username"):

    # attr to return from fetched user