clap/examples/tutorial_derive/03_02_option.rs

use clap::Parser;

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
struct Cli {
    #[clap(short, long)]
    name: Option<String>,
}

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

    println!("name: {:?}", cli.name.as_deref());
}
docs: Re-work examples This creates distinct tutorial examples from complex feature examples (more how-tos). Both sets are getting builder / derive versions (at least the critical ones). 2021-11-30 18:30:19 +00:00			`use clap::Parser;`

			`#[derive(Parser)]`
docs(examples): Steer people to know about about vs long_about `#[clap(about)]` only overrides `about`. If the doc comment also sets `long_about`, it won't be overridden. This change is to help raise visibility of reseting `long_about` in these cases. 2022-01-11 00:47:20 +00:00			`#[clap(author, version, about, long_about = None)]`
docs: Re-work examples This creates distinct tutorial examples from complex feature examples (more how-tos). Both sets are getting builder / derive versions (at least the critical ones). 2021-11-30 18:30:19 +00:00			`struct Cli {`
			`#[clap(short, long)]`
			`name: Option<String>,`
			`}`

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

			`println!("name: {:?}", cli.name.as_deref());`
			`}`