scripts/blender-crawl/blender_crawl/default_scripts/purge.py

@@ -20,5 +20,29 @@
 # (c) 2021, Blender Foundation
 
 import bpy
-bpy.ops.outliner.orphans_purge(do_local_ids=True, do_linked_ids=True, do_recursive=True)
+
+
+def better_purge(context, clear_coll_fake_users=True):
+    """Call Blender's purge function, but first Python-override all library IDs' 
+    use_fake_user to False.
+    Otherwise, linked IDs essentially do not get purged properly.
+
+    Also set all Collections' use_fake_user to False, so unused collections 
+    aren't kept in the file.
+    """
+
+    if clear_coll_fake_users:
+        for coll in bpy.data.collections:
+            coll.use_fake_user = False
+
+    id_list = list(bpy.data.user_map().keys())
+    for id in id_list:
+        if id.library:
+            id.use_fake_user = False
+
+    bpy.ops.outliner.orphans_purge(
+        do_local_ids=True, do_linked_ids=True, do_recursive=True)
+
+
+better_purge()
 bpy.ops.wm.quit_blender()