BlenderKit: automatically purge collections created by the addon

If the collection is empty, it gets removed on file save.
This will only work in new files, since the collections now get a 'is_blenderkit_collection' property when appending.
Don't registter timers when in background

blenderkit/__init__.py

@@ -151,15 +151,16 @@ def scene_load(context):
 @bpy.app.handlers.persistent
 def check_timers_timer():
     ''' checks if all timers are registered regularly. Prevents possible bugs from stopping the addon.'''
-    if not bpy.app.timers.is_registered(search.search_timer):
-        bpy.app.timers.register(search.search_timer)
-    if not bpy.app.timers.is_registered(download.download_timer):
-        bpy.app.timers.register(download.download_timer)
-    if not (bpy.app.timers.is_registered(tasks_queue.queue_worker)):
-        bpy.app.timers.register(tasks_queue.queue_worker)
-    if not bpy.app.timers.is_registered(bg_blender.bg_update):
-        bpy.app.timers.register(bg_blender.bg_update)
-    return 5.0
+    if not bpy.app.background:
+        if not bpy.app.timers.is_registered(search.search_timer):
+            bpy.app.timers.register(search.search_timer)
+        if not bpy.app.timers.is_registered(download.download_timer):
+            bpy.app.timers.register(download.download_timer)
+        if not (bpy.app.timers.is_registered(tasks_queue.queue_worker)):
+            bpy.app.timers.register(tasks_queue.queue_worker)
+        if not bpy.app.timers.is_registered(bg_blender.bg_update):
+            bpy.app.timers.register(bg_blender.bg_update)
+        return 5.0
 
 
 conditions = (
@@ -1907,7 +1908,7 @@ def register():
     asset_bar_op.register()
 
     user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
-    if user_preferences.use_timers:
+    if user_preferences.use_timers and not bpy.app.background:
         bpy.app.timers.register(check_timers_timer, persistent=True)
 
     bpy.app.handlers.load_post.append(scene_load)

blenderkit/append_link.py

@@ -330,6 +330,7 @@ def append_objects(file_name, obnames=[], location=(0, 0, 0), link=False, **kwar
             main_object.parent = bpy.data.objects[kwargs['parent']]
             main_object.matrix_world.translation = location
 
+
         #move objects that should be hidden to a sub collection
         if len(to_hidden_collection)>0 and collection is not None:
             hidden_collection_name = collection_name+'_hidden'
@@ -342,8 +343,11 @@ def append_objects(file_name, obnames=[], location=(0, 0, 0), link=False, **kwar
 
         bpy.ops.object.select_all(action='DESELECT')
         utils.selection_set(sel)
+        #let collection also store info that it was created by BlenderKit, for purging reasons
+        collection['is_blenderkit_asset'] = True
 
         return main_object, return_obs
+
     #this is used for uploads:
     with bpy.data.libraries.load(file_name, link=link, relative=True) as (data_from, data_to):
         sobs = []

blenderkit/bg_blender.py

@@ -268,7 +268,7 @@ def add_bg_process(location=None, name=None, eval_path_computing='', eval_path_s
 def register():
     bpy.utils.register_class(KillBgProcess)
     user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
-    if user_preferences.use_timers:
+    if user_preferences.use_timers and not bpy.app.background:
         bpy.app.timers.register(bg_update)
 
 

blenderkit/download.py

@@ -75,6 +75,10 @@ def check_missing():
 def check_unused():
     '''find assets that have been deleted from scene but their library is still present.'''
     # this is obviously broken. Blender should take care of the extra data automaticlaly
+    #first clean up collections
+    for c in bpy.data.collections:
+        if len(c.all_objects) == 0 and c.get('is_blenderkit_asset'):
+            bpy.data.collections.remove(c)
     return;
     used_libs = []
     for ob in bpy.data.objects:
@@ -493,6 +497,9 @@ def append_asset(asset_data, **kwargs):  # downloaders=[], location=None,
     asset_main['asset_data'] = asset_data  # TODO remove this??? should write to blenderkit Props?
     asset_main.blenderkit.asset_base_id = asset_data['assetBaseId']
     asset_main.blenderkit.id = asset_data['id']
+
+
+
     bpy.ops.wm.undo_push_context(message='add %s to scene' % asset_data['name'])
     # moving reporting to on save.
     # report_use_success(asset_data['id'])
@@ -1446,7 +1453,7 @@ def register_download():
     bpy.app.handlers.load_post.append(scene_load)
     bpy.app.handlers.save_pre.append(scene_save)
     user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
-    if user_preferences.use_timers:
+    if user_preferences.use_timers and not bpy.app.background:
         bpy.app.timers.register(download_timer)
 
 

blenderkit/resolutions.py

@@ -171,10 +171,10 @@ def unpack_asset(data):
     #mark asset browser asset
     data_block = None
     if asset_data['assetType'] == 'model':
-        for ob in bpy.context.scene.objects:
-            if ob.parent == None:
-                ob.asset_mark()
-                data_block = ob
+        for c in bpy.data.collections:
+            if c.get('asset_data') is not None:
+                c.asset_mark()
+                data_block = c
     elif asset_data['assetType'] == 'material':
         for m in bpy.data.materials:
             m.asset_mark()
@@ -192,7 +192,8 @@ def unpack_asset(data):
             tags.remove(t)
         tags.new('description: ' + asset_data['description'])
         tags.new('tags: ' + ','.join(asset_data['tags']))
-        
+    #
+
     bpy.ops.wm.save_mainfile(compress=False)
     # now try to delete the .blend1 file
     try:

blenderkit/search.py

@@ -179,7 +179,7 @@ def scene_load(context):
     purge_search_results()
     fetch_server_data()
     categories.load_categories()
-    if not bpy.app.timers.is_registered(refresh_token_timer):
+    if not bpy.app.timers.is_registered(refresh_token_timer) and not bpy.app.background:
         bpy.app.timers.register(refresh_token_timer, persistent=True, first_interval=36000)
     update_assets_data()
 
@@ -1625,7 +1625,7 @@ def register_search():
         bpy.utils.register_class(c)
 
     user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
-    if user_preferences.use_timers:
+    if user_preferences.use_timers and not bpy.app.background:
         bpy.app.timers.register(search_timer)
 
     categories.load_categories()

blenderkit/tasks_queue.py

@@ -29,7 +29,7 @@ bk_logger = logging.getLogger('blenderkit')
 @persistent
 def scene_load(context):
     user_preferences = bpy.context.preferences.addons['blenderkit'].preferences
-    if user_preferences.use_timers:
+    if user_preferences.use_timers and not bpy.app.background:
         if not (bpy.app.timers.is_registered(queue_worker)):
             bpy.app.timers.register(queue_worker)