MLSysBook CLI v2.0 - Modular Architecture

This directory contains the refactored, modular CLI for the MLSysBook project. The CLI has been broken down from a monolithic 4000+ line script into maintainable, testable modules.

Architecture

cli/
├── __init__.py           # Package initialization
├── main.py              # Main CLI application class
├── core/                # Core functionality
│   ├── config.py        # Configuration management
│   └── discovery.py     # Chapter/file discovery
├── commands/            # Command implementations
│   └── build.py         # Build operations
├── formats/             # Format-specific handlers (future)
└── utils/               # Shared utilities (future)

Key Components

ConfigManager (core/config.py)

• Manages Quarto configuration files for HTML, PDF, and EPUB
• Handles symlink creation and switching between formats
• Provides output directory detection from config files

ChapterDiscovery (core/discovery.py)

• Discovers and validates chapter files
• Supports fuzzy matching for chapter names
• Provides chapter listing and dependency detection

BuildCommand (commands/build.py)

• Handles build operations for all formats
• Supports both full book and individual chapter builds
• Includes progress indication and error handling

MLSysBookCLI (main.py)

• Main application class that orchestrates all components
• Provides command routing and help system
• Beautiful Rich-based UI with organized command tables

Usage

The modular CLI has replaced the original binder and is available as ./binder in the project root:

# Show help
./binder help

# Build commands
./binder build                    # Build full book (HTML)
./binder build intro,ml_systems   # Build specific chapters (HTML)
./binder build pdf intro          # Build chapter as PDF
./binder build epub               # Build full book as EPUB

# Preview commands
./binder preview                  # Start live dev server for full book
./binder preview intro            # Start live dev server for chapter

# Management
./binder list                     # List all chapters
./binder status                   # Show current status
./binder doctor                   # Run comprehensive health check

Benefits of Modular Architecture

1. Maintainability: Each component has a single responsibility
2. Testability: Individual modules can be unit tested
3. Debuggability: Issues can be isolated to specific modules
4. Extensibility: New formats and commands are easy to add
5. Code Reuse: Shared functionality is properly modularized
6. Collaboration: Multiple developers can work on different components

Migration Complete

The modular CLI has successfully replaced the original monolithic binder script:

• ./binder - Modular CLI (4000+ lines → organized modules)

All functionality has been preserved and enhanced:

• All existing commands work the same way
• Same configuration files and output directories
• Same build processes and quality
• Enhanced error handling and progress indication
• New preview and doctor commands added

Future Enhancements

The modular architecture enables easy addition of:

• Format-specific handlers in formats/
• Additional commands in commands/
• Shared utilities in utils/
• Plugin system for custom extensions
• Comprehensive unit test suite