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Diffstat (limited to '')
-rw-r--r-- | vendor/clap/examples/typed-derive.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/vendor/clap/examples/typed-derive.rs b/vendor/clap/examples/typed-derive.rs new file mode 100644 index 000000000..85c750f9c --- /dev/null +++ b/vendor/clap/examples/typed-derive.rs @@ -0,0 +1,46 @@ +// Note: this requires the `derive` feature + +use clap::Parser; +use std::error::Error; + +#[derive(Parser, Debug)] +struct Args { + /// Implicitly using `std::str::FromStr` + #[clap(short = 'O', value_parser)] + optimization: Option<usize>, + + /// Allow invalid UTF-8 paths + #[clap(short = 'I', value_parser, value_name = "DIR", value_hint = clap::ValueHint::DirPath)] + include: Option<std::path::PathBuf>, + + /// Handle IP addresses + #[clap(long, value_parser)] + bind: Option<std::net::IpAddr>, + + /// Allow human-readable durations + #[clap(long, value_parser)] + sleep: Option<humantime::Duration>, + + /// Hand-written parser for tuples + #[clap(short = 'D', value_parser = parse_key_val::<String, i32>)] + defines: Vec<(String, i32)>, +} + +/// Parse a single key-value pair +fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<dyn Error + Send + Sync + 'static>> +where + T: std::str::FromStr, + T::Err: Error + Send + Sync + 'static, + U: std::str::FromStr, + U::Err: Error + Send + Sync + 'static, +{ + let pos = s + .find('=') + .ok_or_else(|| format!("invalid KEY=value: no `=` found in `{}`", s))?; + Ok((s[..pos].parse()?, s[pos + 1..].parse()?)) +} + +fn main() { + let args = Args::parse(); + println!("{:?}", args); +} |