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feat(render): integrate katex-rs math rendering

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Enable ENABLE_MATH in pulldown-cmark options and implement
InlineMath/DisplayMath event handlers in the render pipeline.

- Inline math ($...$) renders via render_math(_, false)
- Display math ($$...$$) wrapped in <div class="math-display">
- Graceful degradation: errors logged to stderr, raw LaTeX shown
  with class="math-error" for styling
This commit is contained in:
Timothy DeHerrera
2026-01-28 20:18:36 -07:00
parent ebe1fd3b6e
commit eeec4a999b
1 changed files with 25 additions and 5 deletions
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30
src/render.rs
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@@ -1,6 +1,6 @@
//! Markdown to HTML rendering via pulldown-cmark with syntax highlighting. //! Markdown to HTML rendering via pulldown-cmark with syntax highlighting.
use crate::highlight::{highlight_code, Language}; use crate::highlight::{Language, highlight_code};
use pulldown_cmark::{CodeBlockKind, Event, Options, Parser, Tag, TagEnd}; use pulldown_cmark::{CodeBlockKind, Event, Options, Parser, Tag, TagEnd};
/// Render markdown content to HTML with syntax highlighting. /// Render markdown content to HTML with syntax highlighting.
@@ -8,7 +8,8 @@ pub fn markdown_to_html(markdown: &str) -> String {
let options = Options::ENABLE_TABLES let options = Options::ENABLE_TABLES
| Options::ENABLE_FOOTNOTES | Options::ENABLE_FOOTNOTES
| Options::ENABLE_STRIKETHROUGH | Options::ENABLE_STRIKETHROUGH
| Options::ENABLE_TASKLISTS; | Options::ENABLE_TASKLISTS
| Options::ENABLE_MATH;
let parser = Parser::new_ext(markdown, options); let parser = Parser::new_ext(markdown, options);
let mut html_output = String::new(); let mut html_output = String::new();
@@ -107,9 +108,28 @@ pub fn markdown_to_html(markdown: &str) -> String {
}; };
html_output.push_str(checkbox); html_output.push_str(checkbox);
} }
Event::InlineMath(_) | Event::DisplayMath(_) => { Event::InlineMath(latex) => match crate::math::render_math(&latex, false) {
// Future: KaTeX integration Ok(rendered) => html_output.push_str(&rendered),
} Err(e) => {
eprintln!("math render error: {e}");
html_output.push_str("<code class=\"math-error\">");
html_output.push_str(&html_escape(&latex));
html_output.push_str("</code>");
}
},
Event::DisplayMath(latex) => match crate::math::render_math(&latex, true) {
Ok(rendered) => {
html_output.push_str("<div class=\"math-display\">\n");
html_output.push_str(&rendered);
html_output.push_str("\n</div>\n");
}
Err(e) => {
eprintln!("math render error: {e}");
html_output.push_str("<pre class=\"math-error\">");
html_output.push_str(&html_escape(&latex));
html_output.push_str("</pre>\n");
}
},
} }
} }