boards/templatetags/board.py

from django.core.urlresolvers import reverse
from django.shortcuts import get_object_or_404
from boards.models import Post
from boards.views import thread
from django import template

register = template.Library()

actions = [
    {
        'name': 'google',
        'link': 'http://google.com/searchbyimage?image_url=%s',
    },
    {
        'name': 'iqdb',
        'link': 'http://iqdb.org/?url=%s',
    },
]


@register.simple_tag(name='post_url')
def post_url(*args, **kwargs):
    post_id = args[0]

    post = get_object_or_404(Post, id=post_id)

    if not post.is_opening():
        link = reverse(thread, kwargs={
            'post_id': post.thread_new.get_opening_post().id}) + '#' + str(
            post_id)
    else:
        link = reverse(thread, kwargs={'post_id': post_id})

    return link


@register.simple_tag(name='image_actions')
def image_actions(*args, **kwargs):
    image_link = args[0]
    if len(args) > 1:
        image_link = 'http://' + args[1] + image_link # TODO https?

    result = ''

    for action in actions:
        result += '[<a href="' + action['link'] % image_link + '">' + \
                  action['name'] + '</a>]'

    return result