pre_get_product_search_form action-hook . WC 1.0
Usage
add_action( 'pre_get_product_search_form', 'action_function_name_3335' );
function action_function_name_3335(){
// action...
}Where the hook is called
pre_get_product_search_form
woocommerce/includes/wc-template-functions.php 2975
do_action( 'pre_get_product_search_form' );