How to use clap crate in Rust CLI parser

Crates/Clap

2026-04-17T12:05:42+00:00

Define CLI arguments using the Parser derive macro and Subcommand enum, then parse them with Cli::parse().

Use the Parser derive macro on a struct and Subcommand on an enum to define CLI arguments, then call Cli::parse() in main to process them.

use clap::{Parser, Subcommand};

#[derive(Parser, Debug)]
struct Cli {
    #[command(subcommand)]
    command: Option<Command>,
}

#[derive(Subcommand, Debug)]
enum Command {
    Supports { renderer: String },
}

fn main() {
    let cli = Cli::parse();
    // Handle cli.command
}

Add clap = { version = "4", features = ["derive"] } to your Cargo.toml dependencies.