[WooCommerce] Order Rows CSS by Role

<?php

/**
 * WooCommerce Order Rows CSS by Role
 *
 * @author dale3h
 */
add_filter( 'post_class', 'wc_highlight_order_rows', 10, 3 );

function wc_highlight_order_rows( $classes, $class, $post_id ) {
    $post = get_post( $post_id );

    if ( $post && in_array( $post->post_type, wc_get_order_types( 'order-meta-boxes' ) ) ) {
        $user = get_userdata( $post->_customer_user );

        if ( $user->roles ) {
            foreach ( $user->roles as $role ) {
                $classes[] = 'role-' . $role;
            }
        }
    }

    return $classes;
}

add_action( 'admin_head', 'wc_highlight_order_rows_stylesheet' );

function wc_highlight_order_rows_stylesheet() {
    global $typenow;

    if ( in_array( $typenow, wc_get_order_types( 'order-meta-boxes' ) ) ) {
        ?>
        <style>
            .striped > tbody > tr:nth-child(even).role-customer {
                background-color: #f5fff5;
            }
            .striped > tbody > tr:nth-child(odd).role-customer {
                background-color: #f0faf0;
            }
        </style>
        <?php
    }
}