Refs #13573 -- Modified the key technique added in r13295 to be more robust...

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

from django.core.exceptions import ImproperlyConfigured

class Loader(BaseLoader):

    is_usable = True

        raise TemplateDoesNotExist(name)

    def load_template(self, template_name, template_dirs=None):

        # Use hash(..) to avoid saving potentially large template_dirs values

        key = hash((template_name, template_dirs))

        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)