Bulk convert dialog: Disable the Use saved conversion settings checkbox when none of the books being converted has saved conversion settings

src/calibre/gui2/convert/bulk.py

@@ -25,7 +25,8 @@ from calibre.utils.logging import Log
 
 class BulkConfig(Config):
 
-    def __init__(self, parent, db, preferred_output_format=None):
+    def __init__(self, parent, db, preferred_output_format=None,
+            has_saved_settings=True):
         ResizableDialog.__init__(self, parent)
 
         self.setup_output_formats(db, preferred_output_format)
@@ -54,6 +55,12 @@ class BulkConfig(Config):
         rb = self.buttonBox.button(self.buttonBox.RestoreDefaults)
         rb.setVisible(False)
         self.groups.setMouseTracking(True)
+        if not has_saved_settings:
+            o = self.opt_individual_saved_settings
+            o.setEnabled(False)
+            o.setToolTip(_('None of the selected books have saved conversion '
+                'settings.'))
+            o.setChecked(False)
 
 
     def setup_pipeline(self, *args):

src/calibre/gui2/tools.py

@@ -112,7 +112,10 @@ def convert_bulk_ebook(parent, queue, db, book_ids, out_format=None, args=[]):
     if total == 0:
         return None, None, None
 
-    d = BulkConfig(parent, db, out_format)
+    has_saved_settings = db.has_conversion_options(book_ids)
+
+    d = BulkConfig(parent, db, out_format,
+            has_saved_settings=has_saved_settings)
     if d.exec_() != QDialog.Accepted:
         return None
 

src/calibre/library/database.py

@@ -1085,6 +1085,11 @@ ALTER TABLE books ADD COLUMN isbn TEXT DEFAULT "" COLLATE NOCASE;
             return cPickle.loads(str(data))
         return None
 
+    def has_conversion_options(self, ids, format='PIPE'):
+        return self.conn.get('''
+            SELECT data FROM conversion_options WHERE book IN %r AND
+        format=? LIMIT 1'''%(tuple(ids),), (format,), all=False) is not None
+
     def delete_conversion_options(self, id, format, commit=True):
         self.conn.execute('DELETE FROM conversion_options WHERE book=? AND format=?',
                 (id, format.upper()))