//! Resolve tool names through PATH, with the same .wasm fallback as the host.
use std::path::Path;
fn main() {
    let mut args = std::env::args().skip(1).peekable();
    let all = args.peek().is_some_and(|arg| arg == "-a");
    if all {
        args.next();
    }
    let names: Vec<_> = args.collect();
    if names.is_empty() || names.iter().any(|name| name.starts_with('-')) {
        eprintln!("usage: which [-a] <name>...");
        std::process::exit(2);
    }
    let path = std::env::var("PATH").unwrap_or_else(|_| "/usr/local/bin:/bin".into());
    let mut missing = false;
    for name in names {
        let paths: Vec<_> = if name.contains('/') {
            vec![name.clone()]
        } else {
            path.split(':')
                .map(|dir| Path::new(dir).join(&name).to_string_lossy().into_owned())
                .collect()
        };
        let mut found = false;
        'search: for path in paths {
            for candidate in [path.clone(), format!("{path}.wasm")] {
                if std::fs::metadata(&candidate).is_ok_and(|metadata| metadata.is_file()) {
                    println!("{candidate}");
                    found = true;
                    if !all {
                        break 'search;
                    }
                }
            }
        }
        missing |= !found;
    }
    std::process::exit(i32::from(missing));
}