disable-cart-page-for-woocommerce.php

<?php

/*
    Plugin Name: Disable cart page for WooCommerce
    Plugin URI: https://code4life.it/shop/plugins/disable-cart-page-for-woocommerce/
    Description: Disable cart page and redirect to checkout for each purchase.
    Author: Code4Life
    Author URI: https://code4life.it/
    Version: 1.3.0-beta
    Text Domain: disable-cart-page-for-woocommerce
    Domain Path: /i18n/
    License: GPLv3
    License URI: http://www.gnu.org/licenses/gpl-3.0.html

    WC requires at least: 3.0
    WC tested up to: 6.1
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) { exit; }

// Add language support to internationalize plugin
add_action( 'init', 'wcdcp_textdomain' );
function wcdcp_textdomain() {
    load_plugin_textdomain( 'disable-cart-page-for-woocommerce', false, dirname( plugin_basename( __FILE__ ) ) . '/i18n/' );
}

// Add link to configuration page into plugin
add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'wcdcp_action_links' );
function wcdcp_action_links( $links ) {
    return array_merge( array(
        'settings' => '<a href="' . admin_url( 'admin.php?page=wc-settings&tab=wcdcp' ) . '">' . __( 'Settings', 'disable-cart-page-for-woocommerce' ) . '</a>'
    ), $links );
}

function wcdcp_fields() {
    $fields = array(
        'section_title-enable' => array(
            'name'     => __( 'Disable cart page', 'disable-cart-page-for-woocommerce' ),
            'type'     => 'title',
            'desc'     => __( 'Enabling this option will delete the cart page and for each purchase customers will be redirected directly to the checkout. They will also be able to buy one type of product at a time.', 'disable-cart-page-for-woocommerce' )
        ),
        'wcdcp_enable' => array(
            'name' => __( 'Enable', 'disable-cart-page-for-woocommerce' ),
            'type' => 'checkbox',
            'desc' => __( 'Disable cart page and redirect directly to checkout', 'disable-cart-page-for-woocommerce' ),
            'id'   => 'wcdcp_enable'
        ),
        'section_end-enable' => array(
             'type' => 'sectionend'
        )
    );

    return apply_filters( 'wcdcp_fields', $fields );
}

// Add settings tab to WooCommerce options
add_filter( 'woocommerce_settings_tabs_array', 'wcdcp_settings_tab', 50 );
function wcdcp_settings_tab( $tabs ) {
    $tabs['wcdcp'] = __( 'Disable cart page', 'disable-cart-page-for-woocommerce' );

    return $tabs;
}

// Add settings to the new tab
add_action( 'woocommerce_settings_tabs_wcdcp', 'wcdcp_settings' );
function wcdcp_settings() {
    woocommerce_admin_fields( wcdcp_fields() );
}

// Save settings
add_action( 'woocommerce_update_options_wcdcp', 'wcdcp_update_settings' );
function wcdcp_update_settings() {
    woocommerce_update_options( wcdcp_fields() );
}

/*** IF PLUGIN IS ENABLED ***/
if ( get_option( 'wcdcp_enable' ) == 'yes' ) {

    // Remove cart button from mini-cart
    remove_action( 'woocommerce_widget_shopping_cart_buttons', 'woocommerce_widget_shopping_cart_button_view_cart', 10 );

    // Add checks and notices
    add_action( 'admin_notices', 'wcdcp_admin_notices' );
    function wcdcp_admin_notices() {
        if ( ! is_plugin_active( 'woocommerce/woocommerce.php' ) ) {
            ?><div class="notice notice-error"><p><?php _e( 'Warning! To use Disable cart page for WooCommerce it need WooCommerce is installed and active.', 'disable-cart-page-for-woocommerce' ); ?></p></div><?php
        }
    }

    // Force WooCommerce to redirect after product added to cart
    add_filter( 'pre_option_woocommerce_cart_redirect_after_add', 'wcdcp_cart_redirect_after_add' );
    function wcdcp_cart_redirect_after_add( $pre_option ) {
        return 'yes';
    }

    add_filter( 'woocommerce_product_settings', 'wcdcp_product_settings' );
    function wcdcp_product_settings( $fields ) {
        foreach ( $fields as $key => $field ) {
            if ( $field['id'] === 'woocommerce_cart_redirect_after_add' ) {
                $fields[$key]['custom_attributes'] = array(
                    'disabled' => true
                );
            }
        }
        return $fields;
    }

    // Empty cart when product is added to cart, so we can't have multiple products in cart
    add_filter( 'woocommerce_add_cart_item_data', 'wcdcp_cart_item_data' );
    function wcdcp_cart_item_data( $cart_item_data ) {
        wc_empty_cart();
        return $cart_item_data;
    };

    // When add a product to cart, redirect to checkout
    add_filter( 'woocommerce_add_to_cart_redirect', 'wcdcp_add_to_cart_redirect' );
    function wcdcp_add_to_cart_redirect() {
            return wc_get_checkout_url();
    }

    // Remove added to cart message
    add_filter( 'wc_add_to_cart_message_html', '__return_null' );

    // If someone reaches the cart page, redirect to checkout permanently
    add_action( 'template_redirect', 'wcdcp_template_redirect' );
    function wcdcp_template_redirect() {
        if ( ! is_cart() ) { return; }
        if ( WC()->cart->get_cart_contents_count() == 0 ) {
            wp_redirect( apply_filters( 'wcdcp_redirect', wc_get_page_permalink( 'shop' ) ) );
            exit;
        }

        // Redirect to checkout page
        wp_redirect( wc_get_checkout_url(), '301' );
        exit;
    }

    // Change add to cart button text ( in loop )
    add_filter( 'woocommerce_product_add_to_cart_text', 'wcdcp_loop_add_to_cart_text' );
    function wcdcp_loop_add_to_cart_text() {
        return __( 'Buy now', 'disable-cart-page-for-woocommerce' );
    }

    // Change add to cart button text ( in product page )
    add_filter( 'woocommerce_product_single_add_to_cart_text', 'wcdcp_product_single_add_to_cart_text' );
    function wcdcp_product_single_add_to_cart_text() {
        return __( 'Buy now', 'disable-cart-page-for-woocommerce' );
    }

    // Clear cart if there are errors
    add_action( 'woocommerce_cart_has_errors', 'wcdcp_clear_cart' );
    function wcdcp_clear_cart() {
        wc_empty_cart();
    }

}