A gutter button that turns lines or a selection into file:line reference badges in a chat composer.
For AI Agents
Hand your agent this brief or the ReUI MCP, not a screenshot. Free to install.
Best for: A gutter plus button that adds the hovered line or the whole selection to a Card composer, where pressing a chip highlights its line
When to use
- Assistant replies and agent output that stream code, or lines a reader picks to ask about
- Code review of diffs, git patches and diagnostics, with accept, reject and fix actions
- Docs snippets and terminal or test logs with line numbers, copy, wrap, folding and search
When not to use
- A selection that feeds a single Ask button with no composer: use the Code Block Line Selection example
- A full assistant conversation screen with thread list, transcript and composer: use the AI Chat blocks
- A discount or promo code shown for a shopper to copy at checkout: use the Coupon blocks
- A release console with environment lanes, a deploy history grid and streaming logs: use the Dev Ops blocks
Agent notes
- The Ask AI
Buttonhas no click handler; send therefsline numbers withPATHto your model from it - Line specs such as
highlightedLines,diffandfoldedcount source lines from 1, whateverstartLineprints in the gutter maxLinescaps height only on the built-in surface; withCodeBlockContentinside your ownScrollArea, cap that viewport yourself- Hoist
transformersto module scope; a new array on every render re-tokenizes the whole file
https://reui.io/components/code-block/c-code-block-25.mdget_example("c-code-block-25")npx shadcn@latest add @reui/c-code-block-25Shadcn Components in Code Block Reference Lines
About Shadcn Code Block Reference Lines
Reference lines in chat. Built by composing Badge, Button, Card, Code Block. A free, open source shadcn code block example you can install with npx shadcn@latest add @reui/c-code-block-25 and edit as your own code.
What You Can Build With Shadcn Code Block Reference Lines
- Composes Badge, Button, Card, Code Block, so it drops into any project already using those components.
- Install it with the shadcn CLI: npx shadcn@latest add @reui/c-code-block-25
- Open source and free, with the full source on this page to copy or adapt.
More Shadcn Code Block Examples
- Basic Basic code block
- Pinned Copy Pinned copy button
- Streaming Agent Streaming agent response
- AI Chat AI chat with code fences
- Diff Summary Diff with change summary
- Transformer Diff Diff via shiki transformers
- Highlights Highlighted lines and words
- Focus Walkthrough Focus walkthrough
- Terminal Output Terminal output
- Long File Long file with expand
- Diagnostics & Actions Line actions and diagnostics
- Line Selection Line selection
Related Shadcn Component Categories
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Frequently Asked Questions
When should I use Shadcn Code Block Reference Lines?
Use it for a gutter plus button that adds the hovered line or the whole selection to a Card composer, where pressing a chip highlights its line.
Shadcn Code Block as a whole fits:
- Assistant replies and agent output that stream code, or lines a reader picks to ask about
- Code review of diffs, git patches and diagnostics, with accept, reject and fix actions
- Docs snippets and terminal or test logs with line numbers, copy, wrap, folding and search
For a selection that feeds a single Ask button with no composer, use the Code Block Line Selection example. For a full assistant conversation screen with thread list, transcript and composer, use the AI Chat blocks. For a discount or promo code shown for a shopper to copy at checkout, use the Coupon blocks. For a release console with environment lanes, a deploy history grid and streaming logs, use the Dev Ops blocks.
How do I install Shadcn Code Block Reference Lines?
Is Shadcn Code Block Reference Lines free to use?
Which components does Shadcn Code Block Reference Lines use?
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