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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /vendor/clap/examples/tutorial_builder/04_02_validate.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/clap/examples/tutorial_builder/04_02_validate.rs')
-rw-r--r-- | vendor/clap/examples/tutorial_builder/04_02_validate.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/vendor/clap/examples/tutorial_builder/04_02_validate.rs b/vendor/clap/examples/tutorial_builder/04_02_validate.rs new file mode 100644 index 000000000..4690e8e12 --- /dev/null +++ b/vendor/clap/examples/tutorial_builder/04_02_validate.rs @@ -0,0 +1,36 @@ +use std::ops::RangeInclusive; + +use clap::{arg, command}; + +fn main() { + let matches = command!() // requires `cargo` feature + .arg( + arg!(<PORT>) + .help("Network port to use") + .value_parser(port_in_range), + ) + .get_matches(); + + // Note, it's safe to call unwrap() because the arg is required + let port: u16 = *matches + .get_one::<u16>("PORT") + .expect("'PORT' is required and parsing will fail if its missing"); + println!("PORT = {}", port); +} + +const PORT_RANGE: RangeInclusive<usize> = 1..=65535; + +fn port_in_range(s: &str) -> Result<u16, String> { + let port: usize = s + .parse() + .map_err(|_| format!("`{}` isn't a port number", s))?; + if PORT_RANGE.contains(&port) { + Ok(port as u16) + } else { + Err(format!( + "port not in range {}-{}", + PORT_RANGE.start(), + PORT_RANGE.end() + )) + } +} |