karsher 0.5.0

karsher is a dumb cache written in rust
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use crate::prelude::*;

pub fn exec_command<'a>(
    command: &'a str,
    extra_args: &'a Option<&'a str>,
) -> Res<'a, ()> {
    let extract_envs = |s| {
        preceded(multispace0, separated_list0(space1, separated_pair(take_until1("="), tag("="), take_until(" "))))
    }(s);

    let extract_args = |s| {
        preceded(
            multispace0,
            separated_list0(
                multispace1,
                alt((
                    delimited(
                        tag("\""),
                        take_while(|s: char| s != '"'),
                        tag("\""),
                    ),
                    verify(
                        take_while(|s: char| !s.is_whitespace()),
                        |s: &str| !s.is_empty(),
                    ),
                )),
            ),
        )(s)
    };

    let (remaining, envs) = extract_envs(command)?;
    let (remaining, program) =
        preceded(multispace0, take_while(|s| s != ' '))(remaining)?;

    let (_, mut args) = extract_args(remaining)?;

    if let Some(extra_args) = extra_args {
        let (_, mut extra_args) = extract_args(extra_args)?;
        args.append(&mut extra_args);
    }

    let handle = Command::new(program)
        .envs(envs)
        .args(&args[..])
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .spawn();

    match handle.and_then(|mut h| h.wait()) {
        Ok(status) => {
            if cfg!(debug_assertions) {
                println!("{status}");
            }
        }
        Err(e) => {
            eprintln!("{program} failed to start with args {args:?}. err: {e}")
        }
    }

    Ok((command, ()))
}

#[cfg(test)]
mod test {
    use super::exec_command;

    #[test]
    fn test_exec_command() {
        exec_command("echo 'hello world'", &None).unwrap();
        println!("bye")
    }
}