calibredb: Add an option to not notify the GUI

src/calibre/library/cli.py

@@ -23,13 +23,16 @@ FIELDS = set(['title', 'authors', 'author_sort', 'publisher', 'rating',
     'formats', 'isbn', 'uuid', 'pubdate', 'cover', 'last_modified',
     'identifiers'])
 
+do_notify = True
 def send_message(msg=''):
+    global do_notify
+    if not do_notify:
+        return
     prints('Notifying calibre of the change')
     from calibre.utils.ipc import RC
-    import time
     t = RC(print_error=False)
     t.start()
-    time.sleep(3)
+    t.join(3)
     if t.done:
         t.conn.send('refreshdb:'+msg)
         t.conn.close()
@@ -42,16 +45,22 @@ def get_parser(usage):
     parser = OptionParser(usage)
     go = parser.add_option_group(_('GLOBAL OPTIONS'))
     go.add_option('--library-path', '--with-library', default=None, help=_('Path to the calibre library. Default is to use the path stored in the settings.'))
+    go.add_option('--dont-notify-gui', default=False, action='store_true',
+            help=_('Do not notify the running calibre GUI (if any) that the database has'
+                ' changed. Use with care, as it can lead to database corruption!'))
 
     return parser
 
 def get_db(dbpath, options):
+    global do_notify
     if options.library_path is not None:
         dbpath = options.library_path
     if dbpath is None:
         raise ValueError('No saved library path, either run the GUI or use the'
                 ' --with-library option')
     dbpath = os.path.abspath(dbpath)
+    if options.dont_notify_gui:
+        do_notify = False
     return LibraryDatabase2(dbpath)
 
 def do_list(db, fields, afields, sort_by, ascending, search_text, line_width, separator,