mirror of
https://github.com/clap-rs/clap
synced 2024-12-14 06:42:33 +00:00
18 lines
490 B
Rust
18 lines
490 B
Rust
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use clap::{app_from_crate, arg};
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fn main() {
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let matches = app_from_crate!()
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.arg(
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arg!(<PORT>)
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.help("Network port to use")
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.validator(|s| s.parse::<usize>()),
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)
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.get_matches();
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// Note, it's safe to call unwrap() because the arg is required
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let port: usize = matches
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.value_of_t("PORT")
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.expect("'PORT' is required and parsing will fail if its missing");
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println!("PORT = {}", port);
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}
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