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"""
Wrapper for loading templates from "template" directories in INSTALLED_APPS
packages.
"""
import os
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.template import TemplateDoesNotExist
from django.utils._os import safe_join
# At compile time, cache the directories to search.
app_template_dirs = []
for app in settings.INSTALLED_APPS:
i = app.rfind('.')
if i == -1:
m, a = app, None
else:
m, a = app[:i], app[i+1:]
try:
if a is None:
mod = __import__(m, {}, {}, [])
else:
mod = getattr(__import__(m, {}, {}, [a]), a)
except ImportError, e:
raise ImproperlyConfigured, 'ImportError %s: %s' % (app, e.args[0])
template_dir = os.path.join(os.path.dirname(mod.__file__), 'templates')
if os.path.isdir(template_dir):
app_template_dirs.append(template_dir)
# It won't change, so convert it to a tuple to save memory.
app_template_dirs = tuple(app_template_dirs)
def get_template_sources(template_name, template_dirs=None):
if not template_dirs:
template_dirs = app_template_dirs
for template_dir in template_dirs:
try:
yield safe_join(template_dir, template_name)
except ValueError:
# The joined path was located outside of template_dir.
pass
def load_template_source(template_name, template_dirs=None):
for filepath in get_template_sources(template_name, template_dirs):
try:
return (open(filepath).read().decode(settings.FILE_CHARSET), filepath)
except IOError:
pass
raise TemplateDoesNotExist, template_name
load_template_source.is_usable = True
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