Show regular price in cart and checkout when using WooCommerce Wholesale Prices - The plugin does not show regular prices but one developer wanted to see them. https://www.damiencarbery/2019/07/show-regular-price-in-cart-and-checkout-when-using-woocommerce-wholesale-prices/

wwp-show-regular-prices.php

<?php
/*
Plugin Name: Wholesale Prices - Show Original Prices
Plugin URI:  https://www.damiencarbery.com/2019/07/show-regular-price-in-cart-and-checkout-when-using-woocommerce-wholesale-prices/
Description: Show the original prices in the Cart and Checkout pages when using WooCommerce Wholesale Prices plugin.
Author: Damien Carbery
Version: 0.3

$Id: wwp-show-orig-prices.php 4747 2019-07-10 15:13:51Z damien $
*/


add_filter( 'woocommerce_cart_product_price', 'dcwd_cart_product_price', 10, 2 );
function dcwd_cart_product_price( $formatted_price, $product ) {
	if ( !class_exists( 'WooCommerceWholeSalePrices' ) ) {
		return $formatted_price;
	}
	if ( !is_user_logged_in() ) {
		return $formatted_price;
	}

	// Check whether the current user has a wholesale role that may have a different price.
	$wwp_class = WooCommerceWholeSalePrices::instance();
	$user_wholesale_role = $wwp_class->wwp_wholesale_roles->getUserWholesaleRole();
	if ( empty( $user_wholesale_role ) ) {
		return $formatted_price;
	}
	//error_log( 'Price: Product ID: '. $product->get_id() );
	//error_log( 'Price: Formatted price: ' . $formatted_price );

	$_product = wc_get_product( $product->get_id() );
	//error_log( 'Price: Product price: '. $_product->get_price() );
	//error_log( 'Price: Original price, formatted: ' . wc_price( $_product->get_price() ) );

	return $formatted_price . '<br /><del>' . wc_price( $_product->get_price() ) . '</del>';
}


add_filter( 'woocommerce_cart_item_subtotal', 'dcwd_cart_item_subtotal', 10, 3 );
function dcwd_cart_item_subtotal( $product_subtotal, $cart_item, $cart_item_key ) {
	if ( !class_exists( 'WooCommerceWholeSalePrices' ) ) {
		return $product_subtotal;
	}
	if ( !is_user_logged_in() ) {
		return $product_subtotal;
	}

	// Check whether the current user has a wholesale role that may have a different price.
	$wwp_class = WooCommerceWholeSalePrices::instance();
	$user_wholesale_role = $wwp_class->wwp_wholesale_roles->getUserWholesaleRole();
	if ( empty( $user_wholesale_role ) ) {
		return $product_subtotal;
	}
	//error_log( 'Subtotal: Product subtotal: ' . $product_subtotal );
	//error_log( 'Subtotal: Product ID: '. $cart_item[ 'product_id' ] );

	$_product = wc_get_product( $cart_item[ 'product_id' ] );
	// If it's a variable product get the info about this variation.
	if ( $_product->is_type( 'variable' ) ) {
		$_product = wc_get_product( $cart_item[ 'variation_id' ] );
	}

	//error_log( 'Subtotal: Original price, formatted: ' . wc_price( $_product->get_price() * $cart_item['quantity'] ) );

	return $product_subtotal . '<br /><del>' . wc_price( $_product->get_price() * $cart_item['quantity'] ) . '</del>';
}