added djangojinja2 extension

--HG--
branch : trunk

diff --git a/ext/djangojinja2.py b/ext/djangojinja2.py
new file mode 100644 (file)
index 0000000..17f06ee
--- /dev/null
+++ b/ext/djangojinja2.py
@@ -0,0 +1,85 @@
+# -*- 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: Copyright 2008 by Armin Ronacher.
+    :license: BSD.
+"""
+from itertools import chain
+from django.conf import settings
+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=not 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=None)