Looked up the default template engine in the list of all engines. (6854998c) · Commits · Dom Sekotill / django

django/template/engine.py

+32 −13

Original line number	Diff line number	Diff line
		import warnings

		from django.conf import settings
		from django.core.exceptions import ImproperlyConfigured
		from django.utils import lru_cache
		from django.utils import six
		@@ -8,6 +7,7 @@ from django.utils.deprecation import RemovedInDjango20Warning
		from django.utils.functional import cached_property
		from django.utils.module_loading import import_string

		from . import engines
		from .base import Context, Lexer, Parser, Template, TemplateDoesNotExist
		from .context import _builtin_context_processors

		@@ -45,19 +45,38 @@ class Engine(object):
		self.string_if_invalid = string_if_invalid
		self.file_charset = file_charset

		@classmethod
		@staticmethod
		@lru_cache.lru_cache()
		def get_default(cls):
		"""Transitional method for refactoring."""
		return cls(
		dirs=settings.TEMPLATE_DIRS,
		allowed_include_roots=settings.ALLOWED_INCLUDE_ROOTS,
		context_processors=settings.TEMPLATE_CONTEXT_PROCESSORS,
		debug=settings.TEMPLATE_DEBUG,
		loaders=settings.TEMPLATE_LOADERS,
		string_if_invalid=settings.TEMPLATE_STRING_IF_INVALID,
		file_charset=settings.FILE_CHARSET,
		)
		def get_default():
		"""
		When only one DjangoTemplates backend is configured, returns it.

		Raises ImproperlyConfigured otherwise.

		This is required for preserving historical APIs that rely on a
		globally available, implicitly configured engine such as:

		>>> from django.template import Context, Template
		>>> template = Template("Hello {{ name }}!")
		>>> context = Context({'name': "world"})
		>>> template.render(context)
		'Hello world!'
		"""
		# Since DjangoTemplates is a wrapper around this Engine class, a local
		# import is mandatory to avoid an import loop.
		from django.template.backends.django import DjangoTemplates
		django_engines = [engine for engine in engines.all()
		if isinstance(engine, DjangoTemplates)]
		if len(django_engines) == 1:
		# Unwrap the Engine instance inside DjangoTemplates
		return django_engines[0].engine
		elif len(django_engines) == 0:
		raise ImproperlyConfigured(
		"No DjangoTemplates backend is configured.")
		else:
		raise ImproperlyConfigured(
		"Several DjangoTemplates backends are configured. "
		"You must select one explicitly.")

		@cached_property
		def template_context_processors(self):

django/template/utils.py

+8 −6

Original line number	Diff line number	Diff line
		from collections import Counter, OrderedDict
		import os
		import sys
		import warnings
		# import warnings

		from django.apps import apps
		from django.conf import settings
		from django.core.exceptions import ImproperlyConfigured
		from django.utils import lru_cache
		from django.utils import six
		from django.utils.deprecation import RemovedInDjango20Warning
		# from django.utils.deprecation import RemovedInDjango20Warning
		from django.utils.functional import cached_property
		from django.utils.module_loading import import_string

		@@ -32,10 +32,12 @@ class EngineHandler(object):
		self._templates = settings.TEMPLATES

		if not self._templates:
		warnings.warn(
		"You haven't defined a TEMPLATES setting. You must do so "
		"before upgrading to Django 2.0. Otherwise Django will be "
		"unable to load templates.", RemovedInDjango20Warning)
		# TODO: re-enable this warning once the entire test suite has been
		# updated to rely on TEMPLATES instead of legacy settings.
		# warnings.warn(
		# "You haven't defined a TEMPLATES setting. You must do so "
		# "before upgrading to Django 2.0. Otherwise Django will be "
		# "unable to load templates.", RemovedInDjango20Warning)
		self._templates = [
		{
		'BACKEND': 'django.template.backends.django.DjangoTemplates',