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docs: fix sidebar scaffold on section-less pages #4177

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docs: fix sidebar scaffold on section-less pages #4177

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8 changes: 5 additions & 3 deletions docs/src/lang_switcher_postprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -397,9 +397,11 @@ def _scaffold_sidebar(content, nav):
"""Section-less pages have no toc2 container; add the body classes and
insert the sidebar div after the page <h1>."""
def body_cls(m):
cls = m.group(1)
return m.group(0) if 'toc2' in cls else f'<body class="{cls} toc2 toc-left"'
content = re.sub(r'<body class="([^"]*)"', body_cls, content, count=1)
attrs, cls = m.group(1), m.group(2)
if 'toc2' in cls:
return m.group(0)
return f'<body{attrs} class="{cls} toc2 toc-left"'
content = re.sub(r'<body\b([^>]*?) class="([^"]*)"', body_cls, content, count=1)
div = f'<div id="toc" class="toc2">{nav}</div>\n'
return re.sub(r'(<div id="header">.*?</h1>\s*)',
lambda m: m.group(1) + div, content, count=1, flags=re.DOTALL)
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