clap/examples/tutorial_derive/04_02_parse.rs

use clap::Parser;

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
struct Cli {
    /// Network port to use
    #[clap(value_parser = clap::value_parser!(u16).range(1..))]
    port: u16,
}

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

    println!("PORT = {}", cli.port);
}
docs(tutorial): Demonstrate custom parsing Adds a more in depth validator to validate that the port is in range in the derive and builder tutorial (section 4.2). This supersedes #3416 2022-02-08 04:50:39 +00:00			`use clap::Parser;`

			`#[derive(Parser)]`
			`#[clap(author, version, about, long_about = None)]`
			`struct Cli {`
			`/// Network port to use`
doc(derive): Update for value_parser 2022-05-21 00:52:04 +00:00			`#[clap(value_parser = clap::value_parser!(u16).range(1..))]`
			`port: u16,`
docs(tutorial): Demonstrate custom parsing Adds a more in depth validator to validate that the port is in range in the derive and builder tutorial (section 4.2). This supersedes #3416 2022-02-08 04:50:39 +00:00			`}`

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

			`println!("PORT = {}", cli.port);`
			`}`