picocli - a mighty tiny command line interface

Picocli is a one-file Java framework for parsing command line arguments and generating polished, easily tailored usage help messages. Java command line parser with both an annotations API and a programmatic API, featuring usage help with ANSI colors, autocomplete and nested subcommands. In a single file, so you can include it in source form. This lets users run picocli-based applications without requiring picocli as an external dependency.