Added a book_edited event

src/calibre/db/cache.py

@@ -137,6 +137,7 @@ class Cache(object):
     All table reading/sorting/searching/caching logic is re-implemented. This
     was necessary for maximum performance and flexibility.
     '''
+    EventType = EventType
 
     def __init__(self, backend):
         self.backend = backend

src/calibre/db/listeners.py

@@ -38,6 +38,9 @@ class EventType(Enum):
     #: Arguments: (field_name, affected book ids, ids of removed items)
     items_removed = auto()
 
+    #: When a book format is edited, with arguments: (book_id, fmt)
+    book_edited = auto()
+
 
 class EventDispatcher:
 

src/calibre/gui2/ui.py

@@ -793,6 +793,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin,  # {{{
                     db.format_metadata(book_id, fmt, allow_cache=False, update_db=True)
                     db.update_last_modified((book_id,))
                     m.refresh_ids((book_id,))
+                    db.event_dispatcher(db.EventType.book_edited, book_id, fmt)
             except Exception:
                 import traceback
                 traceback.print_exc()