Markdown Code Copy Button

Adds a GitHub-like copy button to every fenced code block inside the VS Code Markdown preview.

Features

• Hover any code block in the Markdown preview to reveal a copy button in the top-right corner.
• Copies the rendered code exactly as it appears, including multi-line selections and highlighted lines.
• Provides instant visual feedback (icon swap + accessible label) so you always know when the copy completed.
• Works with light and dark themes, following VS Code color tokens for seamless integration.

Usage

1. Open a Markdown file.
2. Launch the built-in Markdown preview (Markdown: Open Preview command or Ctrl+K V or Ctrl+Shift+V).
3. Hover a code block and press the copy button to send its contents to your clipboard.

That's it—no extra configuration required.

Known Issues

• When clipboard permissions are denied by the OS, the button falls back to the legacy document.execCommand('copy'). If the environment blocks both APIs the operation will fail silently.

Development

• npm install
• npm run watch to keep the TypeScript entry point compiled (even though the feature currently lives in the preview script).
• Press F5 in VS Code to launch an Extension Development Host and test the Markdown preview.

Release Notes

0.1.0

• Marketplace metadata (homepage, bugs URL, keywords and gallery banner) added.
• README now includes a screenshot of the copy button experience.
• Added an activation smoke test that runs with npm test.

0.0.1

• Added automatic copy buttons for Markdown preview code blocks with GitHub-inspired styling and clipboard handling.