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EPUB3 Output: Do not split the nav HTML file in the input document, if any. Prevents duplication of nav and broken links in output nav. Fixes #2117255 [Page-list in EPUB 3 nav can be broken by conversion](https://bugs.launchpad.net/calibre/+bug/2117255)

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Kovid Goyal 2025-07-18 20:18:53 +05:30
parent 4d4f845552
commit 1f0403dfd3
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1 changed files with 11 additions and 1 deletions
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12
src/calibre/ebooks/oeb/transforms/split.py
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@ -14,6 +14,7 @@ import functools
import os
import re
from collections import OrderedDict
from contextlib import suppress
from css_selectors import Select, SelectorError
from lxml import etree
@ -64,8 +65,17 @@ class Split:
self.log('Splitting markup on page breaks and flow limits, if any...')
self.opts = opts
self.map = {}
nav_href = getattr(opts, 'epub3_nav_href', '')
output_supports_nav = False
with suppress(Exception):
output_supports_nav = int(opts.epub_version) >= 3
def is_nav(item):
ans = item.href == nav_href and output_supports_nav
if ans:
self.log(f'Not splitting {nav_href} as it is the EPUB3 nav document')
return ans
for item in list(self.oeb.manifest.items):
if item.spine_position is not None and etree.iselement(item.data):
if item.spine_position is not None and etree.iselement(item.data) and not is_nav(item):
self.split_item(item)
self.fix_links()