Function which

src/mago.rs:120–131

Simple `which`-like lookup: search `$PATH` for an executable with the given name.

(binary_name: &str)

/// Simple `which`-like lookup: search `$PATH` for an executable with
/// the given name.
fn which(binary_name: &str) -> Result<PathBuf, String> {
    let path_var = std::env::var("PATH").map_err(|_| "PATH not set".to_string())?;

    for dir in std::env::split_paths(&path_var) {
        let candidate = dir.join(binary_name);
        if candidate.is_file() && is_executable(&candidate) {
            return Ok(candidate);
        }
    }

    Err(format!("{} not found on PATH", binary_name))
}

/// Check whether a file is executable.
#[cfg(unix)]