Project: demo-blog-engine · Branch: feat/syntax-highlight · Mode: default · Model: claude-sonnet-4-6

Summary

Added syntax highlighting to the blog via syntect. Wired it into the pulldown-cmark code-block callback so fenced code with a language hint gets inline-highlighted HTML. Chose the base16-ocean.dark theme as the default.

Conversation

Turn 1 — User

Add syntax highlighting to code blocks. Use syntect.

Turn 1 — Assistant

Plan:
1. Add syntect = "5" to Cargo.toml
2. Load default syntax + theme sets once at startup
3. In the pulldown-cmark parser, intercept Event::Start(CodeBlock) and replace the body with highlighted_html_for_string

The tricky bit is that pulldown-cmark gives us the code as an Event::Text inside the code-block range, so we need to buffer events between Start(CodeBlock(..)) and End(CodeBlock), then emit a single Html event with the highlighted output.

Tools used in this turn:
- Edit: Cargo.toml — added syntect = "5"
- Read: src/render.rs (1–80)

Turn 2 — User

Sounds right, go ahead.

Turn 2 — Assistant

Wired it up. Using ClassedHTMLGenerator so we emit class="syntect" and style via an external CSS file rather than inline colours (plays nicer with dark-mode toggle later).

Tools used in this turn:
- Edit: src/render.rs — added highlight_block() helper
- Bash: cargo build — exit 0
- Bash: cargo run — exit 0

Connections

- demo-blog-engine — project
- syntect — library
- pulldown-cmark — library
- SyntaxHighlighting — concept