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from pathlib import Path
from django.dispatch import receiver
from django.template import engines
from django.template.backends.django import DjangoTemplates
from django.utils._os import to_path
from django.utils.autoreload import autoreload_started, file_changed, is_django_path
def get_template_directories():
# Iterate through each template backend and find
# any template_loader that has a 'get_dirs' method.
# Collect the directories, filtering out Django templates.
cwd = Path.cwd()
items = set()
for backend in engines.all():
if not isinstance(backend, DjangoTemplates):
continue
items.update(cwd / to_path(dir) for dir in backend.engine.dirs if dir)
for loader in backend.engine.template_loaders:
if not hasattr(loader, "get_dirs"):
continue
items.update(
cwd / to_path(directory)
for directory in loader.get_dirs()
if directory and not is_django_path(directory)
)
return items
def reset_loaders():
from django.forms.renderers import get_default_renderer
for backend in engines.all():
if not isinstance(backend, DjangoTemplates):
continue
for loader in backend.engine.template_loaders:
loader.reset()
backend = getattr(get_default_renderer(), "engine", None)
if isinstance(backend, DjangoTemplates):
for loader in backend.engine.template_loaders:
loader.reset()
@receiver(autoreload_started, dispatch_uid="template_loaders_watch_changes")
def watch_for_template_changes(sender, **kwargs):
for directory in get_template_directories():
sender.watch_dir(directory, "**/*")
@receiver(file_changed, dispatch_uid="template_loaders_file_changed")
def template_changed(sender, file_path, **kwargs):
if file_path.suffix == ".py":
return
for template_dir in get_template_directories():
if template_dir in file_path.parents:
reset_loaders()
return True
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