mirror of
https://github.com/clap-rs/clap
synced 2024-12-15 07:12:32 +00:00
03cb509d6c
This is to make room for a reasonable looking cargo plugin example. I got lazy and didn't update the tutorials.
29 lines
763 B
Rust
29 lines
763 B
Rust
// Note: this requires the `derive` feature
|
|
|
|
use clap::Parser;
|
|
use std::error::Error;
|
|
|
|
#[derive(Parser, Debug)]
|
|
struct Args {
|
|
#[clap(short = 'D', parse(try_from_str = parse_key_val), multiple_occurrences(true))]
|
|
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);
|
|
}
|