Method to check if there are ONLY Gift Vouchers in the cart

[xenowebdev]

What are you trying to do?
I have a scenario where there could be just gift vouchers in a cart. At present the user still has to enter a shipping address, which is not needed as the gift voucher is a download. I want to be able to bypass the user entering a shipping address so I need a way to check if the cart has ONLY gift vouchers.

What's your proposed solution?

As per your suggestion on Discord:

public function hasGiftVouchers($hasOnly = false, $cart = null)
{
    $giftVouchers = [];

    if (!$cart) {
        $cart = Commerce::getInstance()->getCarts()->getCart();
    }

    if (!$cart->lineItems) {
        return false;
    }

    foreach ($cart->lineItems as $lineItem) {
        $isGiftVoucher = (bool)(get_class($lineItem->purchasable) === Voucher::class);

        if ($isGiftVoucher) {
            $giftVouchers[] = $lineItem;
        }
    }

    if ($hasOnly) {
        return (count($cart->lineItems) === count($giftVouchers)) ? true : false;
    } else {
        return count($giftVouchers) ? true : false;
    }
}