toys

https://github.com/dazuma/toys

Toys is a configurable command line tool. Write commands in Ruby using a simple DSL, and Toys will provide the command line executable and take care of all the details such as argument parsing, online help, and error reporting. Toys is designed for software developers, IT professionals, and other power users who want to write and organize scripts to automate their workflows. It can also be used as a replacement for Rake, providing a more natural command line interface for your project's build tasks.