Urlencode filter in Jinja2

Jinja2 lacks a classic urlencode built-in filter (http://jinja.pocoo.org/docs/templates/#builtin-filters). Here is a simple one:

import urllib
from markupsafe import Markup

@app.template_filter('urlencode')
def urlencode_filter(s):
    if type(s) == 'Markup':
        s = s.unescape()
    s = s.encode('utf8')
    s = urllib.quote_plus(s)
    return Markup(s)

Then use it in your Jinja2 template:

{{  variable_to_encode | urlencode }}