a simple jinja template integretion to tornado

jinja_template.py

#!/usr/bin/env python
#fileencoding=utf-8

from jinja2 import Environment
from jinja2 import FileSystemLoader

import datetime


def guess_autoescape(template_name):
    if template_name is None or '.' not in template_name:
        return False
    ext = template_name.rsplit('.', 1)[1]
    return ext in ('html', 'htm', 'xml')


def _ts_format(ts, format="%X %x"):
    dt = datetime.datetime.fromtimestamp(ts)
    return dt.strftime(format)


class JinjaLoader(object):
    def __init__(self, root_path, **kwargs):
        super(JinjaLoader, self).__init__(**kwargs)
        self.env = Environment(loader=FileSystemLoader(root_path),
                               autoescape=guess_autoescape,
                               extensions=['jinja2.ext.autoescape'],
                               trim_blocks=True,
                               lstrip_blocks=True,)

        additional_globals = {
            'ord': ord,
            'chr': chr,
            'unichr': unichr,
        }
        self.env.globals.update(additional_globals)
        self.env.filters['ts_format'] = _ts_format

    def load(self, name, parent_path=None):
        return JinjaTemplate(self.env.get_template(name))

    def reset(self):
        '''Reset the cache of compiled templates, required
           in debug mode.
        '''
        self.env.cache.clear()


class JinjaTemplate(object):
    def __init__(self, template):
        self.template = template

    def generate(self, **kwargs):
        # jinja uses unicode internally but tornado uses utf string
        return self.template.render(**kwargs).encode('utf-8')