--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/template/loaders/cached.py	Wed Jun 02 18:57:35 2010 +0200
@@ -0,0 +1,59 @@
+"""
+Wrapper class that takes a list of template loaders as an argument and attempts
+to load templates from them in order, caching the result.
+"""
+
+from django.core.exceptions import ImproperlyConfigured
+from django.template import TemplateDoesNotExist
+from django.template.loader import BaseLoader, get_template_from_string, find_template_loader, make_origin
+from django.utils.hashcompat import sha_constructor
+from django.utils.importlib import import_module
+
+class Loader(BaseLoader):
+    is_usable = True
+
+    def __init__(self, loaders):
+        self.template_cache = {}
+        self._loaders = loaders
+        self._cached_loaders = []
+
+    @property
+    def loaders(self):
+        # Resolve loaders on demand to avoid circular imports
+        if not self._cached_loaders:
+            for loader in self._loaders:
+                self._cached_loaders.append(find_template_loader(loader))
+        return self._cached_loaders
+
+    def find_template(self, name, dirs=None):
+        for loader in self.loaders:
+            try:
+                template, display_name = loader(name, dirs)
+                return (template, make_origin(display_name, loader, name, dirs))
+            except TemplateDoesNotExist:
+                pass
+        raise TemplateDoesNotExist(name)
+
+    def load_template(self, template_name, template_dirs=None):
+        key = template_name
+        if template_dirs:
+            # If template directories were specified, use a hash to differentiate
+            key = '-'.join([template_name, sha_constructor('|'.join(template_dirs)).hexdigest()])
+
+        if key not in self.template_cache:
+            template, origin = self.find_template(template_name, template_dirs)
+            if not hasattr(template, 'render'):
+                try:
+                    template = get_template_from_string(template, origin, template_name)
+                except TemplateDoesNotExist:
+                    # If compiling the template we found raises TemplateDoesNotExist,
+                    # back off to returning the source and display name for the template
+                    # we were asked to load. This allows for correct identification (later)
+                    # of the actual template that does not exist.
+                    return template, origin
+            self.template_cache[key] = template
+        return self.template_cache[key], None
+
+    def reset(self):
+        "Empty the template cache."
+        self.template_cache.clear()