mamweb/header_fotky/context_processors.py

from datetime import datetime, date
import random

from django.conf import settings

from header_fotky.models import FotkaUrlVazba


def vzhled(request):
    ''' Podle casu prida do templatu, zdali je nebo neni noc '''
    hodin = datetime.now().hour
    if (hodin <= 6) or (hodin >= 20):
        noc = True
        nedoba = 'den'
        doba = 'noc'
    else:
        noc = False
        nedoba = 'noc'
        doba = 'den'
    url = request.path

    fotky = FotkaUrlVazba.objects.exclude(denni_doba=nedoba)
    fotka = None

    # TODO rychlejší patternmatch?
    while (fotka is None) and (url != ''):
        presne = fotky.filter(url__exact=url)
        if presne.count() > 0:
            presne_doba = presne.filter(denni_doba=doba)
            if presne_doba.count() > 0:
                fotka = random.choice(presne_doba).url_fotky()
            else:
                fotka = random.choice(presne).url_fotky()

        url = url[:-1]
        index = url.rfind('/')
        if index != -1:
            url = url[:index+1]

    if fotka is None:
        fotka = settings.STATIC_URL + "images/header/vikendovka.jpg"

    return {'noc': noc, 'fotka': fotka}