clap-rs

Offers both declarative derive macros for rapid prototyping and procedural builder patterns for fine-grained control, as highlighted in the README's key features.

Includes automatic help generation, rich validation, subcommand support, and shell completions for multiple shells, reducing boilerplate code for professional CLI tools.

Designed for speed with minimal runtime overhead, leveraging Rust's zero-cost abstractions to ensure efficient argument parsing without sacrificing features.

Provides extensive documentation on docs.rs and a variety of examples in the repository, making it easier for developers to learn and implement complex CLI logic.