Add an action to remove all formats to the remove books button

src/calibre/gui2/actions/delete.py

@@ -94,6 +94,9 @@ class DeleteAction(InterfaceAction):
         self.delete_menu.addAction(
                 _('Remove all formats from selected books, except...'),
                 self.delete_all_but_selected_formats)
+        self.delete_menu.addAction(
+                _('Remove all formats from selected books'),
+                self.delete_all_formats)
         self.delete_menu.addAction(
                 _('Remove covers from selected books'), self.delete_covers)
         self.delete_menu.addSeparator()
@@ -174,6 +177,28 @@ class DeleteAction(InterfaceAction):
         if ids:
             self.gui.tags_view.recount()
 
+    def delete_all_formats(self, *args):
+        ids = self._get_selected_ids()
+        if not ids:
+            return
+        if not confirm('<p>'+_('<b>All formats</b> for the selected books will '
+                               'be <b>deleted</b> from your library.<br>'
+                               'The book metadata will be kept. Are you sure?')
+                            +'</p>', 'delete_all_formats', self.gui):
+            return
+        db = self.gui.library_view.model().db
+        for id in ids:
+            fmts = db.formats(id, index_is_id=True, verify_formats=False)
+            if fmts:
+                for fmt in fmts.split(','):
+                    self.gui.library_view.model().db.remove_format(id, fmt,
+                            index_is_id=True, notify=False)
+        self.gui.library_view.model().refresh_ids(ids)
+        self.gui.library_view.model().current_changed(self.gui.library_view.currentIndex(),
+                self.gui.library_view.currentIndex())
+        if ids:
+            self.gui.tags_view.recount()
+
     def remove_matching_books_from_device(self, *args):
         if not self.gui.device_manager.is_device_connected:
             d = error_dialog(self.gui, _('Cannot delete books'),