# -*- coding: utf-8 -*-
from django.core.exceptions import ValidationError
import pytils, re

def is_positive_integer(data):
    """
    function checking if data positive integer
    """
    if not data:
        return
    elif data.isdigit() and int(data) > 0:
        return int(data)
    else:
        raise ValidationError('Введите правильное значение')

def translit_with_separator(string, separator='-'):
    """
    Trsanslit string and replace "bad" symbols for separator

    usage: translit_with_separator('введите, слово', '_') return 'vvedite_slovo'

    string must be unicode

    """

    #make string translit
    st = pytils.translit.translify(string)
    #replace "bad" symbols for '-'symbol
    st = re.sub('[^\w\-_\.]', separator, st)
    #delete dublicating separators
    st = re.sub('%s+'%separator, separator, st)

    return st

#def check_url(url, id, Model, field='url', msg='Такой урл уже занят'):
#    try: