Type-Driven Rust CLI with Clap

Rust's strong, static type system allows defining command-line interfaces with type-based contracts.

The clap crate simplifies CLI argument parsing using both builder patterns and derive macros.

Derive-based definitions map Rust structs and enums directly to command-line options and subcommands.

Type-driven CLI specifications enhance code maintainability and readability by centralizing interface definitions.

Declarative argument definitions reduce parsing boilerplate and streamline testing through clap's built-in validation and help generation.

Using tools like cargo-semver-checks on public CLI types enforces proper semantic versioning for binary tools.

Clap's env feature integrates environment variables seamlessly into typed command-line arguments.