mirror of
https://github.com/clap-rs/clap
synced 2024-12-16 07:42:32 +00:00
29 lines
627 B
Rust
29 lines
627 B
Rust
#[macro_use]
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extern crate clap;
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use clap::Clap;
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use std::error::Error;
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fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<Error>>
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where
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T: std::str::FromStr,
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T::Err: Error + 'static,
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U: std::str::FromStr,
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U::Err: Error + '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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#[derive(Clap, Debug)]
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struct Opt {
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#[clap(short = "D", parse(try_from_str = "parse_key_val"))]
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defines: Vec<(String, i32)>,
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}
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fn main() {
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let opt = Opt::parse();
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println!("{:?}", opt);
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}
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