mirror of
https://github.com/clap-rs/clap
synced 2024-09-20 14:31:58 +00:00
34 lines
906 B
Rust
34 lines
906 B
Rust
// Note: this requires the `derive` feature
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use clap::Parser;
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use std::error::Error;
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#[derive(Parser, Debug)]
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struct Args {
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/// Implicitly using `std::str::FromStr`
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#[clap(short = 'O')]
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optimization: Option<usize>,
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/// Hand-written parser for tuples
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#[clap(short = 'D', parse(try_from_str = parse_key_val), multiple_occurrences(true))]
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defines: Vec<(String, i32)>,
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}
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/// Parse a single key-value pair
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fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<dyn Error + Send + Sync + 'static>>
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where
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T: std::str::FromStr,
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T::Err: Error + Send + Sync + 'static,
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U: std::str::FromStr,
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U::Err: Error + Send + Sync + 'static,
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{
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let pos = s
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.find('=')
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.ok_or_else(|| format!("invalid KEY=value: no `=` found in `{}`", s))?;
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Ok((s[..pos].parse()?, s[pos + 1..].parse()?))
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}
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fn main() {
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let args = Args::parse();
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println!("{:?}", args);
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}
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