typed_derive/
fn_parser.rs

1use std::error::Error;
2
3use clap::Args;
4
5#[derive(Args, Debug)]
6pub(crate) struct FnParser {
7    /// Hand-written parser for tuples
8    #[arg(short = 'D', value_name = "KEY=VALUE", value_parser = parse_key_val::<String, i32>)]
9    defines: Vec<(String, i32)>,
10}
11
12/// Parse a single key-value pair
13fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<dyn Error + Send + Sync + 'static>>
14where
15    T: std::str::FromStr,
16    T::Err: Error + Send + Sync + 'static,
17    U: std::str::FromStr,
18    U::Err: Error + Send + Sync + 'static,
19{
20    let pos = s
21        .find('=')
22        .ok_or_else(|| format!("invalid KEY=value: no `=` found in `{s}`"))?;
23    Ok((s[..pos].parse()?, s[pos + 1..].parse()?))
24}
typed_derive/fn_parser.rs

typed_derive/
fn_parser.rs
