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Kobo driver: Possible fix for kobo renderer ignoring hyphenation

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I am guessing the Kobo renderer basically ignores a <style> tag with
id=kobostylehacks as this was likely a legacy hack implemented and later
ignored by Kobo.

So put the hyphenation and other extra css into its own <style> tag.
Hopefully this will get the Kobo rendered to not ignore it.
This commit is contained in:
Kovid Goyal 2025-04-01 13:28:30 +05:30
parent c82f8b2838
commit d1227c0817
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 15 additions and 11 deletions
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26
src/calibre/ebooks/oeb/polish/kepubify.py
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@ -38,6 +38,7 @@ from calibre.utils.localization import canonicalize_lang, get_lang
from calibre.utils.short_uuid import uuid4 from calibre.utils.short_uuid import uuid4
KOBO_CSS_ID = 'kobostylehacks' # kepubify uses class, actual books from Kobo use id KOBO_CSS_ID = 'kobostylehacks' # kepubify uses class, actual books from Kobo use id
EXTRA_CSS_ID = 'kepubify-extra-css'
EXTRA_KOBO_CSS_IDS = ('koboSpanStyle',) # these are present in some kepub files from kobo such as dark forest by cixin liu EXTRA_KOBO_CSS_IDS = ('koboSpanStyle',) # these are present in some kepub files from kobo such as dark forest by cixin liu
KOBO_JS_NAME = 'kobo.js' KOBO_JS_NAME = 'kobo.js'
KOBO_CSS_NAME = 'kobo.css' KOBO_CSS_NAME = 'kobo.css'
@ -62,7 +63,8 @@ def css_parser() -> CSSParser:
class Options(NamedTuple): class Options(NamedTuple):
extra_css: str = KOBO_CSS extra_css: str = ''
hyphenation_css: str = ''
remove_widows_and_orphans: bool = False remove_widows_and_orphans: bool = False
remove_at_page_rules: bool = False remove_at_page_rules: bool = False
@ -86,8 +88,14 @@ def add_style_and_script(root, kobo_js_href: str, opts: Options) -> bool:
def add(parent): def add(parent):
e = parent.makeelement(XHTML('style'), type='text/css', id=KOBO_CSS_ID) e = parent.makeelement(XHTML('style'), type='text/css', id=KOBO_CSS_ID)
e.text = opts.extra_css e.text = KOBO_CSS
insert_self_closing(parent, e) insert_self_closing(parent, e)
extra_css = (opts.hyphenation_css + '\n\n' + opts.extra_css).strip()
if extra_css:
e = parent.makeelement(XHTML('style'), type='text/css', id=EXTRA_CSS_ID)
e.text = '\n' + extra_css
insert_self_closing(parent, e)
e.text += (e.tail or '')
e = parent.makeelement(XHTML('script'), type='text/javascript', src=kobo_js_href) e = parent.makeelement(XHTML('script'), type='text/javascript', src=kobo_js_href)
insert_self_closing(parent, e) insert_self_closing(parent, e)
@ -105,7 +113,7 @@ def is_href_to_fname(href: str | None, fname: str) -> bool:
def remove_kobo_styles_and_scripts(root): def remove_kobo_styles_and_scripts(root):
ids_to_remove = EXTRA_KOBO_CSS_IDS + (KOBO_CSS_ID,) ids_to_remove = EXTRA_KOBO_CSS_IDS + (KOBO_CSS_ID, EXTRA_CSS_ID,)
for style in XPath('//h:style')(root): for style in XPath('//h:style')(root):
if style.get('id') in ids_to_remove: if style.get('id') in ids_to_remove:
extract(style) extract(style)
@ -622,13 +630,9 @@ h1, h2, h3, h4, h5, h6, td {{
hyphens: none !important; hyphens: none !important;
}} }}
''' '''
if extra_css: return Options(
extra_css = KOBO_CSS + '\n\n' + extra_css extra_css=extra_css, hyphenation_css=hyphen_css, remove_widows_and_orphans=remove_widows_and_orphans,
else: remove_at_page_rules=remove_at_page_rules)
extra_css = KOBO_CSS
if hyphen_css:
extra_css += '\n\n' + hyphen_css
return Options(extra_css=extra_css, remove_widows_and_orphans=remove_widows_and_orphans, remove_at_page_rules=remove_at_page_rules)
def profile(): def profile():
@ -655,7 +659,7 @@ def kepubify_main(args=sys.argv):
outpath = '' outpath = ''
if path.endswith('.epub'): if path.endswith('.epub'):
outpath = path[:-4] + 'kepub.epub' outpath = path[:-4] + 'kepub.epub'
kepub_path = kepubify_path(path, outpath, allow_overwrite=True) kepub_path = kepubify_path(path, outpath, allow_overwrite=True, opts=make_options())
print(f'{path} converted to: {kepub_path}') print(f'{path} converted to: {kepub_path}')