mirror of
https://github.com/clap-rs/clap
synced 2024-12-15 07:12:32 +00:00
34 lines
725 B
Rust
34 lines
725 B
Rust
use std::ops::RangeInclusive;
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use clap::Parser;
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#[derive(Parser)]
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#[command(author, version, about, long_about = None)]
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struct Cli {
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/// Network port to use
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#[arg(value_parser = port_in_range)]
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port: u16,
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}
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fn main() {
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let cli = Cli::parse();
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println!("PORT = {}", cli.port);
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}
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const PORT_RANGE: RangeInclusive<usize> = 1..=65535;
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fn port_in_range(s: &str) -> Result<u16, String> {
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let port: usize = s
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.parse()
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.map_err(|_| format!("`{}` isn't a port number", s))?;
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if PORT_RANGE.contains(&port) {
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Ok(port as u16)
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} else {
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Err(format!(
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"port not in range {}-{}",
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PORT_RANGE.start(),
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PORT_RANGE.end()
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))
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}
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}
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