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Twitter template tags and filters

Author:
moxypark
Posted:
August 23, 2010
Language:
Python
Version:
Not specified
Score:
3 (after 3 ratings)

A simple template filter for parsing tweets (linking @ replies, hashtages and standard URLs whilst stripping out links to yFrog and TwitPic images), and two simple tags for displaying the yFrog and TwitPic images linked to in tweets.

If you put the snippet in a file called tweets.py, as long as it lives in an app's templatetags directory, you should be able to do the following (where text refers to the text of a tweet):

{% load twitter %}
<p>{{ text|tweet }}</p>

{% yfrog_images text 1 'fancybox' %}
{% twitpic_images text 1 'fancybox' %}

The first argument in the two tags controls how many images to render. Set this to -1 for an unlimited number, per tweet.

Thumbnail images are displayed, and you can specify the class that is applied to the <a> tags rendered. Here I've used 'fancybox', and I would normally include jQuery code to turn the images inside the <a> tags into lightboxes.

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from django.template import Library
from django.utils.safestring import mark_safe
import re

register = Library()

@register.filter
def tweet(value):
	value = re.sub(r'((mailto\:|(news|(ht|f)tp(s?))\://){1}\S+)', '<a href="\g<0>" rel="external">\g<0></a>', value)
	value = re.sub(r'http://(yfrog|twitpic).com/(?P<id>\w+/?)', '', value)
	value = re.sub(r'#(?P<tag>\w+)', '<a href="http://search.twitter.com/search?tag=\g<tag>" rel="external">#\g<tag></a>', value)
	value = re.sub(r'@(?P<username>\w+)', '@<a href="http://twitter.com/\g<username>/" rel="external">\g<username></a>', value)
	
	return mark_safe(value)

def tweet_attachments(ex, value, max_items = -1):
	start = 0
	matches = ex.search(value, start)
	ids = []
	
	while matches:
		groupdict = matches.groupdict()
		if 'id' in groupdict:
			if not groupdict['id'] in ids:
				ids.append(groupdict['id'])
		
		start = matches.end()
		matches = ex.search(value, start)
	
	if max_items > -1:
		ids = ids[:max_items]
	
	return ids

@register.simple_tag
def yfrog_images(value, max_items = -1, lightbox = None):
	ex = re.compile(r'http://yfrog.com/(?P<id>\w+/?)')
	ids = tweet_attachments(ex, value, max_items)
	
	classes = ['yfrog-thumbnail']
	if lightbox:
		classes += [lightbox]
		extension = ':iphone'
	else:
		extension = ''
	
	urls = '\n'.join(
		[
			'<a href="http://yfrog.com/%(id)s%(extension)s" class="%(classes)s" rel="external"><img src="http://yfrog.com/%(id)s.th.jpg" /></a>' % {
				'id': i,
				'classes': ' '.join(classes),
				'extension': extension
			} for i in ids
		]
	)
	
	return mark_safe(urls)

@register.simple_tag
def twitpic_images(value, max_items = -1, lightbox = None):
	ex = re.compile(r'http://twitpic.com/(?P<id>\w+/?)')
	ids = tweet_attachments(ex, value, max_items)
	
	classes = ['twitpic-thumbnail']
	if lightbox:
		classes += [lightbox]
	
	urls = '\n'.join(
		[
			'<a href="http://twitpic.com/show/full/%(id)s" class="%(classes)s" rel="external"><img src="http://twitpic.com/show/thumb/%(id)s" /></a>' % {
				'id': i,
				'classes': ' '.join(classes),
			} for i in ids
		]
	)

	return mark_safe(urls)

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