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Render literal HTML in message text as text, not live markup #107

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Render literal HTML in message text as text, not live markup #107

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9 changes: 8 additions & 1 deletion src/claude_code_transcripts/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -701,7 +701,14 @@ def format_json(obj):
def render_markdown_text(text):
if not text:
return ""
return markdown.markdown(text, extensions=["fenced_code", "tables"])
# Render literal HTML in message text as visible text rather than live markup: an unclosed
# <style>/<script> in a prompt would otherwise swallow the rest of the page. Deregistering the
# HTML handlers (rather than escaping the input first) keeps fenced code blocks intact, since
# fenced_code stashes their content in a preprocessor that runs before html_block.
md = markdown.Markdown(extensions=["fenced_code", "tables"])
md.preprocessors.deregister("html_block")
md.inlinePatterns.deregister("html")
return md.convert(text)


def is_json_like(text):
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14 changes: 14 additions & 0 deletions tests/test_generate_html.py
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Expand Up @@ -131,6 +131,20 @@ def test_render_markdown_text_empty(self):
assert render_markdown_text("") == ""
assert render_markdown_text(None) == ""

def test_render_markdown_text_escapes_literal_html(self):
"""Literal HTML in message text renders as visible text, not live markup."""
result = render_markdown_text("Leave the <head> and the <style> block alone.")
assert "&lt;head&gt;" in result
assert "&lt;style&gt;" in result
assert "<head>" not in result
assert "<style>" not in result

def test_render_markdown_text_keeps_fenced_html(self):
"""A fenced code block containing HTML is preserved as escaped code, not dropped."""
result = render_markdown_text("text\n\n```html\n<div>x</div>\n```")
assert "<pre>" in result
assert "&lt;div&gt;x&lt;/div&gt;" in result

def test_format_json(self, snapshot_html):
"""Test JSON formatting."""
result = format_json({"key": "value", "number": 42, "nested": {"a": 1}})
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