pi-open-message-in-browser

Markdown preview extension repackaged as CLI and Pi extension. Converts Markdown to GitHub-flavored HTML with syntax highlighting and Mermaid diagram support.

Prerequisites

• Bun (required for CLI and development)
• Pi (required for the Pi extension)

Install

As a Pi extension

just install-extension

As a standalone CLI

just install

This adds the mdopen command to your PATH.

Usage

CLI

mdopen <file.md> [options]

Flag	Description	Default
-t, --theme <theme>	Theme: github, github-dark, auto, or any bundled theme	github
-c, --compiler <compiler>	Markdown compiler: markdown-it, marked, commonmark, remarkable	markdown-it
--toc	Generate a Table of Contents sidebar	off
--math	Enable MathJax for LaTeX rendering	off
--emoji	Enable emoji rendering	off
--no-validate-mermaid	Skip Mermaid diagram validation	on
--width <width>	Content width: auto, full, wide, large, medium, small, tiny	auto
-o, --out <file.html>	Write HTML to this path instead of a temp file	temp file
-b, --browser <command>	Command used to open the file	open (macOS) / xdg-open (Linux)
-n, --no-open	Convert only, don't open a browser	opens by default
-h, --help	Show help

Examples:

mdopen README.md                       # open with github theme
mdopen notes.md --theme github-dark    # force dark theme
mdopen notes.md --out notes.html -n    # just convert, don't open
mdopen notes.md --toc --math           # with ToC and LaTeX support

Pi extension

Once installed, the extension adds a command to open the last assistant message in your browser:

/open-last-in-browser

The extension:

• Extracts the last assistant response from the conversation
• Converts Markdown to styled HTML with Mermaid support
• Opens it in your default browser

Development

bun install               # link workspaces
bun run --filter mdopen build   # compile mdopen

📜 License

This project is licensed under the MIT License.