Add text after price unless the price is zero, then Call for price in WooCommerce

Question

I have products with prices that need to all end with "per sq. ft." I want this to only apply to products of a particular category and only when the price is greater than 0.
When the product has no price listed I need the price to say "Call for Price" without the square footage text after it.

So here is a start I found online but they dont have any conditions associated with them so they apply to all product all the time.

/* Display "Call for Price" instead of empty price */
add_filter( 'woocommerce_get_price_html', 'custom_price_message' );
function custom_price_message( $price ) {
    $vat = ' per sq. ft.';
    return $price . $vat;
}

/* Display "Call for Price" instead of empty price */
add_filter('woocommerce_empty_price_html', 'custom_call_for_price');
add_filter('woocommerce_variable_empty_price_html', 'custom_call_for_price');
add_filter('woocommerce_variation_empty_price_html', 'custom_call_for_price');
function custom_call_for_price() {
     return 'Call for Price';
}

Answer 1

Thank you both for the help. I used both of your code strings and here is what i came up with:

add_filter( 'woocommerce_get_price_html', 'custom_price_message' );

function custom_price_message($price) {

if ( !has_term( 'stone', 'product_cat' ) ) {
   return $price;

} elseif (!empty($price)){
   $vat = ' per ft<sup>2</sup>';
   return $price . $vat;

 }else{
   return 'Call for Price';
 }
}

Answer 2

add_filter( 'woocommerce_get_price_html', 'custom_price_message' );
function custom_price_message($price) {
 if(!empty($price)){
   $vat = 'Your Text Here';
   return $price . $vat;
 }else{
   return 'CALL FOR PRICE';
 }
}

I hope this works.

Add text after price unless the price is zero, then Call for price in WooCommerce

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