Code block styling and syntax highlighting#4
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genmon merged 2 commits intoinanimate-tech:mainfrom Apr 10, 2026
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Fenced code blocks (``` ... ```) now get a background color and monospace font via the existing markdown decoration system, matching the inline code style. Fence delimiters are dimmed, inline markdown patterns are suppressed inside code blocks, and the max-width constraint is lifted for code content.
Integrates sugar-high (~1KB gzipped, zero deps) for syntax highlighting inside fenced code blocks. Tokens are applied as ProseMirror inline decorations (sh-keyword, sh-string, sh-comment, etc.) with colours for both light and dark themes. Built-in language presets for JS/TS/JSX (default), Python, Rust, Go, C/C++, Java, and CSS. Unrecognised languages fall back to the default JS-oriented tokenizer which handles most C-family syntax reasonably.
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Fenced code blocks (``` ... ```) now render with a background colour, monospace font, and syntax highlighting — bringing them in line with how inline
codeis already styled. Fixes #3.What changed
background/font and suppressing inline markdown patterns (bold, italic, etc.) inside code blocks.
themes are covered.
Why sugar-high?
The editor renders markdown as plain text with ProseMirror decorations — there are no structured CodeBlock nodes in the schema. This rules out the usual ProseMirror/TipTap syntax highlighting extensions (@tiptap/extension-code-block-lowlight, prosemirror-highlight, etc.) which all expect a dedicated code block node type.
sugar-highis a good fit because:If you later move to a richer document schema with actual code block nodes, we could swap in lowlight or Shiki, but sugar-high fits the current decoration-based architecture well.