CLI Reference

Complete reference for mbr’s command-line interface.

For configuration file settings, environment variables, and feature-specific behavior tuning, see the Configuration Reference.

Usage

mbr [OPTIONS] [PATH]

If PATH is omitted, mbr uses the current directory.

Mode Flags

These flags are mutually exclusive:

Media File Arguments in GUI Mode

When a media file (video, audio, image, or PDF) is passed as the PATH argument in GUI mode, mbr automatically opens the appropriate media viewer instead of displaying the raw file. For example, mbr -g videos/demo.mp4 opens the video viewer at /.mbr/videos/?path=%2Fvideos%2Fdemo.mp4.

Supported media types are detected by file extension:

Options

Boolean Flag Naming Convention

mbr uses two patterns for boolean flags that disable behavior:

• --skip-X: Skips a build-time operation. Example: --skip-link-checks skips link validation during static builds.
• --no-X: Disables a runtime feature. Example: --no-link-tracking disables bidirectional link tracking.

Verbosity Levels

The RUST_LOG environment variable overrides these flags.

Examples

# Launch GUI (default mode)
mbr ~/notes
mbr README.md

# Render single file to stdout (CLI mode)
mbr -o README.md
mbr -o README.md > output.html

# Start server on default port
mbr -s ~/notes

# Start server with debug logging
mbr -s -vv ~/notes

# Launch GUI window (explicit)
mbr -g ~/notes

# Open a media file in the GUI media viewer
mbr -g videos/example.mp4    # Opens video viewer
mbr -g music/song.mp3        # Opens audio player
mbr -g images/photo.jpg      # Opens image viewer
mbr -g docs/paper.pdf        # Opens PDF viewer

# Build static site
mbr -b ~/notes

# Build to custom directory
mbr -b --output ./public ~/notes

# Use custom template folder
mbr -s --template-folder ./my-theme ~/notes

# Increase oembed timeout
mbr -s --oembed-timeout-ms 2000 ~/notes

# Disable oembed fetching (uses plain links)
mbr -s --oembed-timeout-ms 0 ~/notes

Media Viewer Endpoints

mbr provides dedicated viewer pages for media files. These endpoints render media content within the site’s navigation chrome (header, breadcrumbs, theme) for a consistent browsing experience.

Available Endpoints

Usage

Each endpoint accepts a path query parameter specifying the media file location (relative to repository root):

# Video viewer
http://localhost:5200/.mbr/videos/?path=/videos/demo.mp4

# PDF viewer
http://localhost:5200/.mbr/pdfs/?path=/docs/report.pdf

# Audio player
http://localhost:5200/.mbr/audio/?path=/music/track.mp3

The path parameter should be URL-encoded if it contains spaces or special characters:

# Path with spaces
http://localhost:5200/.mbr/videos/?path=/videos/My%20Video.mp4

Features

Video viewer:

• Native HTML5 video player with controls
• Automatic poster image from .cover.jpg sidecar files
• Chapter navigation via mbr-video-extras component (if .chapters.en.vtt exists)
• Captions/transcripts support (if .captions.en.vtt exists)

PDF viewer:

• Embedded PDF viewer using native browser support
• Fallback link to open PDF in new tab

Audio player:

• Native HTML5 audio player with controls
• Cover art display from .cover.jpg sidecar files
• Filename display

Security

The media viewer validates all paths to prevent directory traversal attacks:

• Paths containing .. are rejected
• Paths must resolve within the repository root
• URL-encoded traversal attempts are detected and blocked

Invalid paths return an error page rather than exposing file system contents.

Static Builds

During static site generation (-b), media viewer pages are generated at:

build/
└── .mbr/
    ├── videos/
    │   └── index.html
    ├── pdfs/
    │   └── index.html
    └── audio/
        └── index.html

These pages work identically in static builds using client-side JavaScript to load and display media based on the path query parameter.

Examples

# Start server and open video viewer
mbr -s ~/notes
open "http://localhost:5200/.mbr/videos/?path=/videos/demo.mp4"

# Generate static site with media viewers
mbr -b ~/notes
# Viewer pages are at build/.mbr/videos/index.html, etc.

# Test directory traversal protection (should show error)
curl -s "http://localhost:5200/.mbr/videos/?path=/../../../etc/passwd"
# Returns error page, not file contents