from django import template
from bestpractices.models import BestPractice
import re

register = template.Library()

def link_bps(value):
  r = r'BP\:[0-9][0-9]?'
  matches = re.findall(r, value)
  for match in matches:
    id = int(match.replace("BP:", "").strip())
    try:
      bp = BestPractice.objects.get(pk=id)
      title = bp.title
      html = "<a class='bpRelated' href='/itf/bestpractices/stories#%d' title='View related Best Practice story'>%s</a>" % (id, title,)
      value = value.replace(match, html, 1)
    except:
      value = value.replace(match, '', 1)
  return value

register.filter("link_bps", link_bps)