from django import template
from django.template.defaultfilters import stringfilter
from django.utils.safestring import mark_safe

register = template.Library()

@register.filter
@stringfilter
def twitterize(value, autoescape=None):
	from django.utils.html import urlize
	import re
	# Link URLs
	value = urlize(value, nofollow=False, autoescape=autoescape)
	# Link twitter usernames prefixed with @
	value = re.sub(r'(\s+|\A)@([a-zA-Z0-9\-_]*)\b',r'\1<a href="http://twitter.com/\2">@\2</a>',value)
	# Link hash tags
	value = re.sub(r'(\s+|\A)#([a-zA-Z0-9\-_]*)\b',r'\1<a href="http://search.twitter.com/search?q=%23\2">#\2</a>',value)
	return mark_safe(value)
twitterize.is_safe=True
twitterize.needs_autoescape = True