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https://github.com/clap-rs/clap
synced 2025-03-04 23:37:32 +00:00
ee3eab1614
Adds a more in depth validator to validate that the port is in range in the derive and builder tutorial (section 4.2). This supersedes #3416
33 lines
778 B
Rust
33 lines
778 B
Rust
use clap::Parser;
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use std::ops::RangeInclusive;
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use std::str::FromStr;
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const PORT_RANGE: RangeInclusive<usize> = 1..=65535;
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#[derive(Parser)]
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#[clap(author, version, about, long_about = None)]
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struct Cli {
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/// Network port to use
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#[clap(validator = port_in_range)]
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port: usize,
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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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fn port_in_range(s: &str) -> Result<(), String> {
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usize::from_str(s)
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.map(|port| PORT_RANGE.contains(&port))
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.map_err(|e| e.to_string())
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.and_then(|result| match result {
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true => Ok(()),
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false => 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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