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# -*- coding: utf-8 -*-
"""
djangojinja2
~~~~~~~~~~~~
Adds support for Jinja2 to Django.
Configuration variables:
======================= =============================================
Key Description
======================= =============================================
`JINJA2_TEMPLATE_DIRS` List of template folders
`JINJA2_EXTENSIONS` List of Jinja2 extensions to use
`JINJA2_CACHE_SIZE` The size of the Jinja2 template cache.
======================= =============================================
:copyright: (c) 2009 by the Jinja Team.
:license: BSD.
"""
from itertools import chain
from django.conf import settings
from django.http import HttpResponse
from django.core.exceptions import ImproperlyConfigured
from django.template.context import get_standard_processors
from django.template import TemplateDoesNotExist
from jinja2 import Environment, FileSystemLoader, TemplateNotFound
from jinja2.defaults import DEFAULT_NAMESPACE
# the environment is unconfigured until the first template is loaded.
_jinja_env = None
def get_env():
"""Get the Jinja2 env and initialize it if necessary."""
global _jinja_env
if _jinja_env is None:
_jinja_env = create_env()
return _jinja_env
def create_env():
"""Create a new Jinja2 environment."""
searchpath = list(settings.JINJA2_TEMPLATE_DIRS)
return Environment(loader=FileSystemLoader(searchpath),
auto_reload=settings.TEMPLATE_DEBUG,
cache_size=getattr(settings, 'JINJA2_CACHE_SIZE', 50),
extensions=getattr(settings, 'JINJA2_EXTENSIONS', ()))
def get_template(template_name, globals=None):
"""Load a template."""
try:
return get_env().get_template(template_name, globals=globals)
except TemplateNotFound, e:
raise TemplateDoesNotExist(str(e))
def select_template(templates, globals=None):
"""Try to load one of the given templates."""
env = get_env()
for template in templates:
try:
return env.get_template(template, globals=globals)
except TemplateNotFound:
continue
raise TemplateDoesNotExist(', '.join(templates))
def render_to_string(template_name, context=None, request=None,
processors=None):
"""Render a template into a string."""
context = dict(context or {})
if request is not None:
context['request'] = request
for processor in chain(get_standard_processors(), processors or ()):
context.update(processor(request))
return get_template(template_name).render(context)
def render_to_response(template_name, context=None, request=None,
processors=None, mimetype=None):
"""Render a template into a response object."""
return HttpResponse(render_to_string(template_name, context, request,
processors), mimetype=mimetype)
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