From cb1f70e8169cb9be3d175dc73d8539c78ff11409 Mon Sep 17 00:00:00 2001 From: Kovid Goyal Date: Wed, 8 Nov 2023 08:32:58 +0530 Subject: [PATCH] Better error message for malformed wrap rules in Transform HTML --- src/calibre/ebooks/html_transform_rules.py | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/calibre/ebooks/html_transform_rules.py b/src/calibre/ebooks/html_transform_rules.py index 82133fa1ff..bb48b95d62 100644 --- a/src/calibre/ebooks/html_transform_rules.py +++ b/src/calibre/ebooks/html_transform_rules.py @@ -243,7 +243,10 @@ def empty(tag): def parse_start_tag(text): - tag = parse(text, namespace_elements=True, fragment_context='div')[0] + try: + tag = parse(text, namespace_elements=True, fragment_context='div')[0] + except IndexError as e: + raise ValueError(_('No tag found in: {}. The tag specification must be of the form for example:

')) from e return {'tag': tag.tag, 'attrib': tag.items()}