Disables repeat purchases for products within a particular category

wc-disable-repeat-purchase-for-category.php

<?php // only copy if needed

/**
 * Helper function to see if a customer has purchased a product 
 * in a given category
 *
 * REQUIRES WC 2.5+
 *
 * @param \WC_Product $product the WooCommerce product instance
 * @return bool - true if product is in category and has been purchased
 */
function sv_wc_has_customer_purchased( $product ) {

	// enter the category for which a single purchase is allowed
	$non_repeatable = 'clothing';
	
	// bail if this product is in not in our target category
	if ( ! has_term( $non_repeatable, 'product_cat', $product->get_id() ) ) {
		return false;
	}
    
	// the product has our target category, so return whether the customer purchased
	return wc_customer_bought_product( wp_get_current_user()->user_email, get_current_user_id(), $product->get_id() );
}


/**
 * Disables repeat purchase for a product category; checks if a product is in the category
 * and if it's already been purchased, then disables purchasing if so
 * 
 * @param bool $purchasable true if product can be purchased
 * @param \WC_Product $product the WooCommerce product
 * @return bool - the updated is_purchasable check
 */
function sv_wc_disable_repeat_purchase( $purchasable, $product ) {

	if ( sv_wc_has_customer_purchased( $product ) ) {
		$purchasable = false;
	}
    
	// double-check for variations: if parent is not purchasable, then variation is not
	if ( $purchasable && $product->is_type( 'variation' ) ) {
		$purchasable = $product->parent->is_purchasable();
	}
    
	return $purchasable;
}
add_filter( 'woocommerce_variation_is_purchasable', 'sv_wc_disable_repeat_purchase', 10, 2 );
add_filter( 'woocommerce_is_purchasable', 'sv_wc_disable_repeat_purchase', 10, 2 );


/**
 * Shows a "purchase disabled" message to the customer
 */
function sv_purchase_disabled_message() {

	// get the current product to check if purchasing should be disabled
	global $product;
	
	// now we know we're in the category, check if we've purchased already
	if ( sv_wc_has_customer_purchased( $product ) ) {
		// Create your message for the customer here
		echo '<div class="woocommerce"><div class="woocommerce-info wc-nonpurchasable-message">
		You\'ve already purchased this product! It can only be purchased once.
		</div></div>';
	}
}
add_action( 'woocommerce_single_product_summary', 'sv_purchase_disabled_message', 31 );