Function detect_aur_helper 

pub fn detect_aur_helper() -> Option<AurHelper>

What: Detect the preferred AUR helper available on PATH.

Inputs: None.

Output:

• Some(AurHelper::Paru) when paru is available.
• Some(AurHelper::Yay) when only yay is available.
• None when neither helper is installed.

Details:

• Preference order (paru first, yay fallback) matches Pacsea’s install flow.
• Detection is explicit: command builders never call this implicitly, so callers can override the choice (e.g., from user configuration).

Example

use arch_toolkit::install::detect_aur_helper;

match detect_aur_helper() {
    Some(helper) => println!("Using AUR helper: {helper}"),
    None => eprintln!("No AUR helper (paru/yay) found."),
}