Adding JSONP to turbogears

from tg import json_encode, response
from tg.render import _get_tg_vars

def render_jsonp(template_name, template_vars, **kwargs):
    callback = template_name or kwargs.pop('callback', None) or 'callback'

    for key in _get_tg_vars():
        del template_vars[key]response.headers['Content-Type'] = 'text/javascript'
        return '%s(%s)' % (template_name, json_encode(template_vars))

    from myapp.config.app_cfg import base_config
    base_config.render_functions['jsonp'] = render_jsonpbase_config.mimetype_lookup = {'.jsonp': 'text/javascript'}

courtesy of Pederson:

https://github.com/TurboGears/tg2/issues/2