ToC Editor: Allow bulk renaming of items

ToC Editor: Allow bulk renaming of items. Simply select the items you
want to rename, right click and choose bulk rename. Useful if, for
instance, you want to rename all the items to be Chapter 1, Chapter 2
and so on.

src/calibre/gui2/toc/main.py

@@ -490,6 +490,15 @@ def title_case(self):
             t = unicode(item.data(0, Qt.DisplayRole).toString())
             item.setData(0, Qt.DisplayRole, titlecase(t))
 
+    def bulk_rename(self):
+        from calibre.gui2.tweak_book.file_list import get_bulk_rename_settings
+        sort_map = {item:i for i, item in enumerate(self.iteritems())}
+        items = sorted(self.selectedItems(), key=lambda x:sort_map.get(x, -1))
+        fmt, num = get_bulk_rename_settings(self, len(items), msg=_(
+            'All selected items will be renamed to the form prefix-number'), sanitize=lambda x:x, leading_zeros=False)
+        for i, item in enumerate(items):
+            item.setData(0, Qt.DisplayRole, fmt % (num + i))
+
     def keyPressEvent(self, ev):
         if ev.key() == Qt.Key_Left and ev.modifiers() & Qt.CTRL:
             self.move_left()
@@ -531,6 +540,7 @@ def key(k):
                 m.addAction(QIcon(I('forward.png')), (_('Indent "%s"')%ci)+key(Qt.Key_Right), self.move_right)
             m.addAction(QIcon(I('edit_input.png')), _('Change the location this entry points to'), self.edit_item)
             m.addAction(_('Change all selected items to title case'), self.title_case)
+            m.addAction(QIcon(I('modified.png')), _('Bulk rename all selected items'), self.bulk_rename)
             m.exec_(QCursor.pos())
 # }}}