for k, v in args.items():

        uri_tmpl = uri_tmpl.replace('{%s}' % k, v)

    # remove leading @ sign if it's present. Case of empty user

    url_obj = urlobject.URLObject(uri_tmpl)

    url = url_obj.with_netloc(url_obj.netloc.lstrip('@'))

    return safe_unicode(url)

def get_changeset_safe(repo, rev):

    """

    Safe version of get_changeset if this changeset doesn't exists for a

    repo it returns a Dummy one instead

    :param repo:

    :param rev:

    """

    from kallithea.lib.vcs.backends.base import BaseRepository

    from kallithea.lib.vcs.exceptions import RepositoryError

    from kallithea.lib.vcs.backends.base import EmptyChangeset

    if not isinstance(repo, BaseRepository):

        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)

# Must match regexp in kallithea/public/js/base.js MentionsAutoComplete()

# Matching is gready so we don't have to look beyond the end.

def extract_mentioned_users(s):

    r"""

    Returns unique usernames from given string s that have @mention

    :param s: string to get mentions

    >>> extract_mentioned_users('@1-2.a_X,@1234 not@not @ddd@not @n @ee @ff @gg, @gg;@hh @n\n@zz,')

    ['1-2.a_X', '1234', 'ddd', 'ee', 'ff', 'gg', 'hh', 'zz']

    """

    usrs = set()

    for username in MENTIONS_REGEX.findall(s):

        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):

        os.environ['PATH'] = '%s:%s' % (cur_path, os.environ['PATH'])

def obfuscate_url_pw(engine):

    from sqlalchemy.engine import url as sa_url

    from sqlalchemy.exc import ArgumentError

    try:

        _url = sa_url.make_url(engine or '')

    except ArgumentError:

        return engine

    if _url.password:

        _url.password = 'XXXXX'