306 lines
11 KiB
PHP
306 lines
11 KiB
PHP
<?php
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/*
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Plugin Name: Extended Table of Contents (with nextpage support)
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Plugin URI: http://www.happybooking.de/wordpress/plugins/extended-toc
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Description: This plugin automatically generates and inserts a table of contents (ToC) to your pages and posts, based on tags h1-h6. Whenever the plugin discovers more than a certain amount of headings (default: 3) the ToC is inserted at the top of the page. This plugin also can handle posts that are divided into pages by the nextpage-wordpress-tag. Any feedback or suggestions are welcome.
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Version: 0.6.4
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Author: HappyBooking UG // Daniel Boldura
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Author URI: http://www.happybooking.de/
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/* Copyright 2013 HappyBooking UG // Daniel Boldura (email: info at happybooking.de or daniel at boldura.de)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* Planed features and todos:
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*
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* 1. Collision detection for anchors
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* 2. Header hierarchie
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* 3. Support markups for show or hide the ToC on single pages/posts
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* 4. Config the ToC within a markup e.g. [extoc start=5 headers=1,2,3 title="My table of contents"] oder [extoc start=5 headers=1,2,3 notitle]
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*/
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define( 'EXTENDED_TOC_VERSION', '0.6.4' );
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define( 'EXTENDED_TOC_ID', 'extended_toc' );
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define( 'EXTENDED_TOC_NAME', 'Extended-ToC' );
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if( !class_exists('ExToC') ) {
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class ExToC
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{
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private $path;
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private $content = "";
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private $fullcontent = "";
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private $pages = array();
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private $ID = 0;
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private $counter = 1;
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private $totalHeadings = 0;
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public function __construct() {
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$this->path = plugins_url( '', __FILE__ );
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$this->exclude_post_types = array( 'attachment', 'revision', 'nav_menu_item', 'safecss' );
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// get options
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$defaults = array( // default options
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'heading_text' => 'Contents',
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'start' => 3,
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'show_heading_text' => true,
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'auto_insert_post_types' => array('page', 'post'),
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'heading_levels' => array('1', '2', '3', '4', '5', '6'),
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);
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$options = get_option( EXTENDED_TOC_ID, $defaults );
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$this->options = wp_parse_args( $options, $defaults );
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add_action( 'plugins_loaded', array(&$this, 'plugins_loaded') );
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if( is_admin() ) {
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add_action('admin_init', array(&$this, 'admin_init'));
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add_action('admin_menu', array(&$this, 'admin_menu'));
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}
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else {
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/** Add the content filter and enqueue css **/
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add_filter( 'the_content', array(&$this, 'the_content'), 10 );
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add_action( 'wp_enqueue_scripts', array(&$this, 'wp_enqueue_scripts') );
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}
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}
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public function __destruct() {
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}
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public function admin_init() {
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wp_register_style( EXTENDED_TOC_ID, $this->path . '/admin-style.css', array(), EXTENDED_TOC_VERSION );
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wp_enqueue_style(EXTENDED_TOC_ID);
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}
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public function admin_menu() {
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// Create menu tab
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$page = add_submenu_page( 'plugins.php', EXTENDED_TOC_NAME, EXTENDED_TOC_NAME, 'manage_options', EXTENDED_TOC_ID, array(&$this, 'admin_options') );
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}
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private function save_admin_options()
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{
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global $post_id;
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// security check
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if ( !wp_verify_nonce( @$_POST[EXTENDED_TOC_ID], plugin_basename(__FILE__) ) )
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return false;
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// require an administrator level to save
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if ( !current_user_can( 'manage_options', $post_id ) )
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return false;
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$this->options = array_merge(
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$this->options,
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array(
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'heading_text' => stripslashes( trim($_POST['heading_text']) ),
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'auto_insert_post_types' => @(array)$_POST['auto_insert_post_types'],
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)
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);
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// update_option will return false if no changes were made
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update_option( EXTENDED_TOC_ID, $this->options );
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return true;
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}
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public function admin_options() {
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if( isset($_GET['update']) ) {
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if( $this->save_admin_options() )
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$msg = '<div id="message" class="updated fade"><p>' . __('Options saved.', EXTENDED_TOC_ID) . '</p></div>';
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else
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$msg = '<div id="message" class="error fade"><p>' . __('Save failed.', EXTENDED_TOC_ID) . '</p></div>';
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}
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?>
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<div class="wrap">
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<div id="icon-plugins" class="icon32">
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<br />
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</div>
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<h2><?=__("Extended Table of Contents", EXTENDED_TOC_ID)?></h2>
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<?=$msg?>
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<form method="post" action="<?php echo htmlentities('?page=' . $_GET['page'] . '&update'); ?>">
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<?php wp_nonce_field( plugin_basename(__FILE__), EXTENDED_TOC_ID ); ?>
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<div class="form_container">
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<table class="form-table">
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<tbody>
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<tr>
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<th><label for="heading_text"><?=__('Heading text', EXTENDED_TOC_ID); ?></label></th>
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<td><input id="heading_text" type="text" class="regular-text" name="heading_text" value="<?=$this->options['heading_text']?>" /></td>
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</tr>
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<tr>
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<th><?=__('Add table of contents to following content types', EXTENDED_TOC_ID); ?></th>
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<td>
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<?php foreach( get_post_types() as $post_type ): ?>
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<?php if( !in_array($post_type, $this->exclude_post_types) ): ?>
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<input type="checkbox" value="<?=$post_type?>" id="auto_insert_post_types_<?=$post_type?>" name="auto_insert_post_types[]"<?=in_array($post_type, $this->options['auto_insert_post_types'])?' checked="checked"':''?> />
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<label for="auto_insert_post_types_<?=$post_type?>"><?=$post_type?></label><br />
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<?php endif; ?>
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<?php endforeach; ?>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p class="submit"><input class="button-primary" type="submit" value="<?=__("Save Options", EXTENDED_TOC_ID)?>" name="submit" /></p>
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</form>
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</div>
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<?php
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}
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public function wp_enqueue_scripts() {
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wp_register_style(EXTENDED_TOC_ID, $this->path . '/style.css', array(), POWER_TOC_VERSION);
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wp_enqueue_style(EXTENDED_TOC_ID);
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}
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public function plugins_loaded() {
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load_plugin_textdomain( EXTENDED_TOC_ID, false, dirname(plugin_basename(__FILE__)) . '/locale/' );
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}
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public function the_content($content) {
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global $post;
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if ( is_feed() )
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return $content;
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if( !in_array(get_post_type($post), $this->options['auto_insert_post_types'])|| is_search() || is_archive() || is_front_page() )
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return $content;
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/** Extract the content, and extract the part content if <!--nextpage--> was used **/
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$this->content = $content;
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$this->extract_full_post_content();
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$toc_content = "<div id=\"toc-np-container\">";
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if( $this->options['show_heading_text'] == true )
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$toc_content .= "<p id=\"toc-np-title\">" . $this->options["heading_text"] . "</p>";
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$toc_content .= "<ul class=\"no-bullets\">";
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$toc_content .= $this->extract_toc();
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$toc_content .= "</ul></div>";
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if( $this->totalHeadings >= $this->options['start'] )
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return $toc_content . $this->content;
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else
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return $this->content;
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}
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/** Extract the full unshortened content from the post **/
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private function extract_full_post_content() {
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global $post;
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$this->fullcontent = $post->post_content;
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$this->ID = $post->ID;
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}
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private function extract_toc() {
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/** check within the full content how many pages exists */
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$this->extract_pages();
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$headers = "";
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/** Extract headings from every pages */
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for( $pagenum = 1; $pagenum <= count($this->pages); $pagenum++ ) {
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$headers .= $this->exctract_headings($pagenum);
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}
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return $headers;
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}
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private function extract_pages() {
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/** Split the content by "nextpage"-tags if some exists */
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$this->pages = preg_split("/<!--nextpage-->/msuU", $this->fullcontent);
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}
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private function exctract_headings($pagenum) {
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/** find all header tags within the page **/
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preg_match_all('/(<h([1-6]{1})[^>]*>).*<\/h\2>/msuU', $this->pages[$pagenum-1], $matches, PREG_SET_ORDER);
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/** Check the headings that are desired */
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if ( count($this->options['heading_levels']) != 6 ) {
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$new_matches = array();
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for ($i = 0; $i < count($matches); $i++) {
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if ( in_array($matches[$i][2], $this->options['heading_levels']) )
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$new_matches[] = $matches[$i];
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}
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$matches = $new_matches;
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}
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$items = "";
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for( $i = 0; $i < count($matches); $i++ ) {
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/** get anchor and add to find and replace arrays **/
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$anchor = $this->url_encode_anchor($matches[$i][0]);
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$find[] = $matches[$i][0];
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$this->content = str_replace(
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array(
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$matches[$i][1], // start of heading
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'</h' . $matches[$i][2] . '>' // end of heading
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),
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array(
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$matches[$i][1] . '<span id="' . $anchor . '">',
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'</span></h' . $matches[$i][2] . '>'
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),
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$this->content
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);
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/** build html */
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$items .= '<li>';
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$items .= '<a href="?p='.$this->ID.($pagenum>1?'&page='.$pagenum:'').'#' . $anchor . '">';
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$items .= "<span class=\"toc-np-number\">" . $this->counter++ . "</span> ";
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$items .= strip_tags($matches[$i][0]) . '</a>';
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$items .= '</li>';
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$this->totalHeadings++;
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}
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return $items;
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}
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private function url_encode_anchor($anchor)
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{
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$return = false;
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if(!empty($anchor) ) {
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/** Remove tags */
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$return = trim( strip_tags($anchor) );
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/** remove & */
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$return = str_replace( '&', '', $return );
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/** remove all unknown chars **/
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$return = preg_replace("/[^0-9a-zA-Z \-_]+/", "", $return);
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/** Remove backspace etc */
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$return = preg_replace("/[\s]+/", "-", $return);
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/** If we now start or end with a - or _ remove it */
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$return = preg_replace("/^[-_]/", "", $return);
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$return = preg_replace("/[-_]$/", "", $return);
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}
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return $return;
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}
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}
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}
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/** Initialise the class */
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$tocPlugin = new ExToC();
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?>
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