--- a/diff.py	Sun Nov 12 14:23:59 2017 +0800
+++ b/diff.py	Sun Nov 12 14:28:14 2017 +0800
@@ -104,6 +104,8 @@
             if new > 1:
                 todo.insert(0, (a, old))
             for lines, version in todo:
+                if versions[version]['attrs']['visible'] != 'true':
+                    continue
                 lines.append('')
                 lines.append('{} {}'.format(kind, id))
                 lines += [