mirror of
https://github.com/clap-rs/clap
synced 2024-12-14 14:52:33 +00:00
18 lines
490 B
Rust
18 lines
490 B
Rust
|
use clap::{app_from_crate, arg};
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let matches = app_from_crate!()
|
||
|
|
.arg(
|
||
|
|
arg!(<PORT>)
|
||
|
|
.help("Network port to use")
|
||
|
|
.validator(|s| s.parse::<usize>()),
|
||
|
|
)
|
||
|
|
.get_matches();
|
||
|
|
|
||
|
|
// Note, it's safe to call unwrap() because the arg is required
|
||
|
|
let port: usize = matches
|
||
|
|
.value_of_t("PORT")
|
||
|
|
.expect("'MODE' is required and parsing will fail if its missing");
|
||
|
|
println!("PORT = {}", port);
|
||
|
|
}
|