Clap

A simple to use, efficient, and full-featured Command Line Argument Parser for Rust

Overview

Clap is a command-line argument parser for Rust that helps you parse command-line arguments by defining a struct, enum, or slice.

Features

• Declarative API
• Derive macros
• Argument parsing
• Help generation
• Shell completion
• Validation
• Custom error messages

Getting Started

# Cargo.toml
[dependencies]
clap = { version = "4.0", features = ["derive"] }

Basic Example

use clap::Parser;

#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
    /// Name of the person to greet
    #[arg(short, long)]
    name: String,

    /// Number of times to greet
    #[arg(short, long, default_value_t = 1)]
    count: u8,
}

fn main() {
    let cli = Cli::parse();

    for _ in 0..cli.count {
        println!("Hello {}!", cli.name);
    }
}

PAPER-CODE Integration

PAPER-CODE provides:

• Clap project templates
• CLI structure patterns
• Testing configurations
• Cargo workspace setup

Resources

• Clap Documentation
• Clap GitHub