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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /vendor/clap/examples/tutorial_derive/04_02_validate.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/clap/examples/tutorial_derive/04_02_validate.rs')
-rw-r--r-- | vendor/clap/examples/tutorial_derive/04_02_validate.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/vendor/clap/examples/tutorial_derive/04_02_validate.rs b/vendor/clap/examples/tutorial_derive/04_02_validate.rs new file mode 100644 index 000000000..7dac79c9f --- /dev/null +++ b/vendor/clap/examples/tutorial_derive/04_02_validate.rs @@ -0,0 +1,34 @@ +use std::ops::RangeInclusive; + +use clap::Parser; + +#[derive(Parser)] +#[clap(author, version, about, long_about = None)] +struct Cli { + /// Network port to use + #[clap(value_parser = port_in_range)] + port: u16, +} + +fn main() { + let cli = Cli::parse(); + + println!("PORT = {}", cli.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() + )) + } +} |