raise Exception('You must pass an Repository '

                        'object as first argument got %s', type(repo))

    try:

        cs = repo.get_changeset(rev)

    except (RepositoryError, LookupError):

        cs = EmptyChangeset(requested_revision=rev)

    return cs

def datetime_to_time(dt):

    if dt:

        return time.mktime(dt.timetuple())

def time_to_datetime(tm):

    if tm:

        if isinstance(tm, basestring):

            try:

                tm = float(tm)

            except ValueError:

                return

        return datetime.datetime.fromtimestamp(tm)

def extract_mentioned_users(s):

    Returns unique usernames from given string s that have @mention

    :param s: string to get mentions

    """

    usrs = set()

        usrs.add(username)

    return sorted(list(usrs), key=lambda k: k.lower())

class AttributeDict(dict):

    def __getattr__(self, attr):

        return self.get(attr, None)

    __setattr__ = dict.__setitem__

    __delattr__ = dict.__delitem__

def fix_PATH(os_=None):

    """

    Get current active python path, and append it to PATH variable to fix issues

    of subprocess calls and different python versions

    """

    if os_ is None:

        import os

    else:

        os = os_

    cur_path = os.path.split(sys.executable)[0]

    if not os.environ['PATH'].startswith(cur_path):

                var re = new RegExp();

                var org = myAC.getInputEl().value;

                var chunks = myAC.dataSource.chunks

                // replace middle chunk(the search term) with actuall  match

                chunks[1] = chunks[1].replace('@'+myAC.dataSource.mentionQuery,

                                              '@'+oData.nname+' ');

                myAC.getInputEl().value = chunks.join('')

                myAC.getInputEl().focus(); // Y U NO WORK !?

            } else {

                //groups

                myAC.getInputEl().value = oData.grname;

                $('#perm_new_member_type').val('users_group');

            }

        });

    }

    // in this keybuffer we will gather current value of search !

    // since we need to get this just when someone does `@` then we do the

    // search

    ownerAC.dataSource.chunks = [];

    ownerAC.dataSource.mentionQuery = null;

    ownerAC.get_mention = function(msg, max_pos) {

        var org = msg;

        var chunks  = [];

        var to_max = msg.substr(0, max_pos);

        var at_pos = Math.max(0,to_max.lastIndexOf('@')-1);

        var msg2 = to_max.substr(at_pos);

        chunks.push(org.substr(0,at_pos))// prefix chunk

        chunks.push(msg2)                // search chunk

        chunks.push(org.substr(max_pos)) // postfix chunk

        // clean up msg2 for filtering and regex match

        var msg2 = msg2.lstrip(' ').lstrip('\n');

        if(re.test(msg2)){

            var unam = re.exec(msg2)[1];

            return [unam, chunks];

        }

        return [null, null];

    };

    $divid = $('#'+divid);

    $divid.keyup(function(e){

            var currentMessage = $divid.val();

            var currentCaretPosition = $divid[0].selectionStart;

            var unam = ownerAC.get_mention(currentMessage, currentCaretPosition);

                           ('TRUE', True),

                           ('T', True),

                           ('False', False),

                           ('F', False),

                           ('FALSE', False),

                           ('0', False),

                           ('-1', False),

                           ('', False)

    ])

    def test_str2bool(self, str_bool, expected):

        from kallithea.lib.utils2 import str2bool

        self.assertEqual(str2bool(str_bool), expected)

    def test_mention_extractor(self):

        from kallithea.lib.utils2 import extract_mentioned_users

        sample = (

            "@first hi there @marcink here's my email marcin@email.com "

            "@lukaszb check @one_more22 it pls @ ttwelve @D[] @one@two@three "

            "@MARCIN    @maRCiN @2one_more22 @john please see this http://org.pl "

            "@marian.user just do it @marco-polo and next extract @marco_polo "

            "user.dot  hej ! not-needed maril@domain.org"

        )

        s = sorted([

        self.assertEqual(s, extract_mentioned_users(sample))

    @parameterized.expand([

        (dict(), u'just now'),

        (dict(seconds= -1), u'1 second ago'),

        (dict(seconds= -60 * 2), u'2 minutes ago'),

        (dict(hours= -1), u'1 hour ago'),

        (dict(hours= -24), u'1 day ago'),

        (dict(hours= -24 * 5), u'5 days ago'),

        (dict(months= -1), u'1 month ago'),

        (dict(months= -1, days= -2), u'1 month and 2 days ago'),

        (dict(years= -1, months= -1), u'1 year and 1 month ago'),

    ])

    def test_age(self, age_args, expected):

        from kallithea.lib.utils2 import age

        from dateutil import relativedelta

        n = datetime.datetime(year=2012, month=5, day=17)

        delt = lambda *args, **kwargs: relativedelta.relativedelta(*args, **kwargs)

        self.assertEqual(age(n + delt(**age_args), now=n), expected)

    @parameterized.expand([

        (dict(), u'just now'),

        (dict(seconds=1), u'in 1 second'),