Add BasePlugin.register_auto_watched_folder()

CHANGES.txt

@@ -6,6 +6,7 @@ Features
 
 * Provide the full ``GLOBAL_CONTEXT`` to the post list shortcode plugin
   (Issue #3481)
+* Add ``BasePlugin.register_auto_watched_folder()``
 
 New in v8.1.2
 =============

nikola/nikola.py

@@ -414,6 +414,7 @@ def __init__(self, **config):
         self.injected_deps = defaultdict(list)
         self.shortcode_registry = {}
         self.metadata_extractors_by = default_metadata_extractors_by()
+        self.registered_auto_watched_folders = set()
 
         self.rst_transforms = []
         self.template_hooks = {

nikola/plugin_categories.py

@@ -98,6 +98,9 @@ def get_deps(self, filename):
         """Find the dependencies for a file."""
         return []
 
+    def register_auto_watched_folder(self, folder: str) -> None:
+        self.site.registered_auto_watched_folders.add(folder)
+
 
 class PostScanner(BasePlugin):
     """The scan method of these plugins is called by Nikola.scan_posts."""

nikola/plugins/command/auto/__init__.py

@@ -184,6 +184,7 @@ def _execute(self, options, args):
             watched.add(item)
         for item in self.site._plugin_places:
             watched.add(item)
+        watched |= self.site.registered_auto_watched_folders
         # Nikola itself (useful for developers)
         watched.add(pkg_resources.resource_filename('nikola', ''))