Clap

Command Line Argument Parser for Rust

Clap is a fast, feature-rich command line argument parser for Rust. It supports subcommands, shell completions, great help messages, custom parsing, and derive macros. Known for its excellent documentation and ergonomic API, Clap prioritizes performance while providing a declarative way to define CLI interfaces. It is the most popular CLI library in the Rust ecosystem and a core dependency of Rust tooling.