]>
Commit | Line | Data |
---|---|---|
62c5094d FG |
1 | use std::ops::RangeInclusive; |
2 | ||
3 | use clap::Parser; | |
4 | ||
5 | #[derive(Parser)] | |
6 | #[clap(author, version, about, long_about = None)] | |
7 | struct Cli { | |
8 | /// Network port to use | |
9 | #[clap(value_parser = port_in_range)] | |
10 | port: u16, | |
11 | } | |
12 | ||
13 | fn main() { | |
14 | let cli = Cli::parse(); | |
15 | ||
16 | println!("PORT = {}", cli.port); | |
17 | } | |
18 | ||
19 | const PORT_RANGE: RangeInclusive<usize> = 1..=65535; | |
20 | ||
21 | fn port_in_range(s: &str) -> Result<u16, String> { | |
22 | let port: usize = s | |
23 | .parse() | |
24 | .map_err(|_| format!("`{}` isn't a port number", s))?; | |
25 | if PORT_RANGE.contains(&port) { | |
26 | Ok(port as u16) | |
27 | } else { | |
28 | Err(format!( | |
29 | "Port not in range {}-{}", | |
30 | PORT_RANGE.start(), | |
31 | PORT_RANGE.end() | |
32 | )) | |
33 | } | |
34 | } |