appenv

Create a simple yet robust command-line tool using Python that helps users manage their personal library of books. This tool, named 'BookManager', will utilize the 'appenv' package to ensure it can self-bootstrap and update itself as needed, providing a seamless experience for its users.

The core functionalities of BookManager include:
- Adding new books to the user's library
- Listing all books in the library
- Searching for a specific book by title or author
- Updating book details (e.g., adding notes)
- Removing books from the library

For added functionality and user-friendliness, consider implementing:
- Support for multiple categories or tags for each book
- A feature to sort the book list by various criteria (e.g., title, author, date added)
- An option to export the library to a CSV file for backup purposes
- Integration with a simple database to store book information persistently

To utilize the 'appenv' package effectively:
1. Use 'appenv' to bootstrap the initial setup of the BookManager application, ensuring all necessary dependencies are installed automatically.
2. Implement a mechanism within the application to check for updates periodically and use 'appenv' to handle any required updates seamlessly.
3. Provide users with a command to manually trigger an update check through the CLI interface.

This project aims to demonstrate the power of 'appenv' in managing application environments while building a useful tool for book enthusiasts.