woocommerce-book-chapter-tab.php

<?php
/*
 * Plugin Name: E-Commerce Book Chapter Tab
 * Plugin URI: https://code.recuweb.com/download/woocommerce-book-chapter-tab/
 * Description: Extends WC to allow you to display the Chapters and Sections of a book, ebook or documentation in a new tab on the single product page.
 * Version: 3.0.8
 * Author: Rafasashi
 * Author URI: https://code.recuweb.com/about-us/
 * Requires at least: 4.6
 * Tested up to: 6.1.1
 *
 * Text Domain: wc_book_chapter
 * Domain Path: /lang/
 * 
 * Copyright: © 2018 Recuweb.
 * License: GNU General Public License v3.0
 * License URI: https://code.recuweb.com/product-licenses/
 */

	if(!defined('ABSPATH')) exit; // Exit if accessed directly
 
	/**
	* Minimum version required
	*
	*/
	if ( get_bloginfo('version') < 3.3 ) return;
	
	// Load plugin class files
	require_once( 'includes/class-ecommerce-book-chapter-tab.php' );
	require_once( 'includes/class-ecommerce-book-chapter-tab-settings.php' );
	
	// Load plugin libraries
	require_once( 'includes/lib/class-ecommerce-book-chapter-tab-admin-api.php' );
	require_once( 'includes/lib/class-ecommerce-book-chapter-tab-admin-notices.php' );
	require_once( 'includes/lib/class-ecommerce-book-chapter-tab-post-type.php' );
	require_once( 'includes/lib/class-ecommerce-book-chapter-tab-taxonomy.php' );		
	
	/**
	 * Returns the main instance of ECommerce_Book_Chapter_Tab to prevent the need to use globals.
	 *
	 * @since  1.0.0
	 * @return object ECommerce_Book_Chapter_Tab
	 */
	function ECommerce_Book_Chapter_Tab() {
				
		$instance = ECommerce_Book_Chapter_Tab::instance( __FILE__, '1.0.7' );	
		
		if ( is_null( $instance->notices ) ) {
			
			$instance->notices = ECommerce_Book_Chapter_Tab_Admin_Notices::instance( $instance );
		}
		
		if ( is_null( $instance->settings ) ) {
			
			$instance->settings = ECommerce_Book_Chapter_Tab_Settings::instance( $instance );
		}

		return $instance;
	}	

	// Checks if the ECommerce plugins is installed and active.
	
	$plugins = apply_filters('active_plugins', get_option('active_plugins'));
	
	if(in_array('woocommerce/woocommerce.php', $plugins)){
		
		if(!in_array('woo-book-chapter-tab-premium/ecommerce-book-chapter-tab-premium.php', $plugins)){
			
			ECommerce_Book_Chapter_Tab();
		}
	}
	else{
		
		add_action('admin_notices', function(){
			
			global $current_screen;
			
			if($current_screen->parent_base == 'plugins'){
				
				echo '<div class="error"><p>Book Chapter Tab '.__('requires <a href="http://www.woothemes.com/woocommerce/" target="_blank">ECommerce</a> to be activated in order to work. Please install and activate <a href="'.admin_url('plugin-install.php?tab=search&type=term&s=ECommerce').'" target="_blank">ECommerce</a> first.', 'wc_book_chapter').'</p></div>';
			}
		});
	}