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# Wrapper for loading templates from eggs via pkg_resources.resource_string.
from __future__ import unicode_literals
import warnings
from django.apps import apps
from django.template import Origin, TemplateDoesNotExist
from django.utils import six
from django.utils.deprecation import RemovedInDjango20Warning
from .base import Loader as BaseLoader
try:
from pkg_resources import resource_string
except ImportError:
resource_string = None
warnings.warn('The egg template loader is deprecated.', RemovedInDjango20Warning)
class EggOrigin(Origin):
def __init__(self, app_name, pkg_name, *args, **kwargs):
self.app_name = app_name
self.pkg_name = pkg_name
super(EggOrigin, self).__init__(*args, **kwargs)
class Loader(BaseLoader):
def __init__(self, engine):
if resource_string is None:
raise RuntimeError("Setuptools must be installed to use the egg loader")
super(Loader, self).__init__(engine)
def get_contents(self, origin):
try:
source = resource_string(origin.app_name, origin.pkg_name)
except:
raise TemplateDoesNotExist(origin)
if six.PY2:
source = source.decode(self.engine.file_charset)
return source
def get_template_sources(self, template_name):
pkg_name = 'templates/' + template_name
for app_config in apps.get_app_configs():
yield EggOrigin(
app_name=app_config.name,
pkg_name=pkg_name,
name="egg:%s:%s" % (app_config.name, pkg_name),
template_name=template_name,
loader=self,
)
def load_template_source(self, template_name, template_dirs=None):
"""
Loads templates from Python eggs via pkg_resource.resource_string.
For every installed app, it tries to get the resource (app, template_name).
"""
warnings.warn(
'The load_template_sources() method is deprecated. Use '
'get_template() or get_contents() instead.',
RemovedInDjango20Warning,
)
for origin in self.get_template_sources(template_name):
try:
return self.get_contents(origin), origin.name
except TemplateDoesNotExist:
pass
raise TemplateDoesNotExist(template_name)
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