如何开发一个自动生成目录树的WordPress插件

<?php
/**
 * Plugin Name: Table of Contents
 * Description: Automatically generates a table of contents for your WordPress posts and pages.
 * Version: 1.0.0
 * Author: Your Name
 * License: GPL2
 */

// 插件代码将在这里添加
?>

// 激活插件时添加设置菜单
function toc_add_settings_menu() {
  add_options_page( 'Table of Contents Settings', 'Table of Contents', 'manage_options', 'table-of-contents-settings', 'toc_render_settings_page' );
}
add_action( 'admin_menu', 'toc_add_settings_menu' );

// 渲染设置页面
function toc_render_settings_page() {
  ?>
  <div class="wrap">
    <h1>Table of Contents Settings</h1>
    <form method="post" action="options.php">
      <?php settings_fields( 'toc_settings_group' ); ?>
      <?php do_settings_sections( 'toc_settings_page' ); ?>
      <?php submit_button(); ?>
    </form>
  </div>
  <?php
}

// 注册设置字段
function toc_register_settings() {
  register_setting( 'toc_settings_group', 'toc_display_options' );
  add_settings_section( 'toc_general_section', 'General Settings', 'toc_general_section_callback', 'toc_settings_page' );
  add_settings_field( 'toc_display_options_field', 'Display Options', 'toc_display_options_field_callback', 'toc_settings_page', 'toc_general_section' );
}
add_action( 'admin_init', 'toc_register_settings' );

// 渲染字段
function toc_display_options_field_callback() {
  $options = get_option( 'toc_display_options' );
  $pages = get_pages();
  foreach ( $pages as $page ) {
    $checked = isset( $options[$page->ID] ) ? checked( $options[$page->ID], $page->post_title, false ) : '';
    echo '<input type="checkbox" name="toc_display_options[' . $page->ID . ']" value="' . esc_attr( $page->post_title ) . '" ' . $checked . '> ' . esc_html( $page->post_title ) . '<br>';
  }
}

// 保存设置
function toc_save_settings() {
  if ( isset( $_POST['toc_display_options'] ) ) {
    $options = array();
    foreach ( $_POST['toc_display_options'] as $page_id => $title ) {
      $options[$page_id] = $title;
    }
    update_option( 'toc_display_options', $options );
  }
}
add_action( 'admin_post_save_toc_settings', 'toc_save_settings' );

// 生成目录树
function toc_generate_toc() {
  $options = get_option( 'toc_display_options' );
  if ( $options ) {
    global $post;
    if ( isset( $options[$post->ID] ) ) {
      $content = apply_filters( 'the_content', $post->post_content );
      $pattern = "/<h([1-6])>(.*?)</h[1-6]>/";
      preg_match_all( $pattern, $content, $headings, PREG_SET_ORDER );
      $tree = array();
      foreach ( $headings as $heading ) {
        $level = intval( $heading[1] );
        $title = strip_tags( $heading[2] );
        $tree[] = array(
          'level' => $level,
          'title' => $title
        );
      }
      $toc_html = '<ul class="toc">';
      $current_level = 0;
      foreach ( $tree as $branch ) {
        if ( $branch['level'] == $current_level ) {
          $toc_html .= '</li><li>';
        } elseif ( $branch['level'] > $current_level ) {
          $toc_html .= '<ul>';
        } elseif ( $branch['level'] < $current_level ) {
          $toc_html .= '</li>';
          for ( $i = $branch['level']; $i < $current_level; $i++ ) {
            $toc_html .= '</ul></li>';
          }
          $toc_html .= '<li>';
        }
        $toc_html .= '<a href="#' . sanitize_title( $branch['title'] ) . '">' . esc_html( $branch['title'] ) . '</a>';
        $current_level = $branch['level'];
      }
      $toc_html .= '</li>';
      for ( $i = $current_level; $i > 0; $i-- ) {
        $toc_html .= '</ul></li>';
      }
      $toc_html .= '</ul>';
      return $toc_html;
    }
  }
}
add_shortcode( 'table_of_contents', 'toc_generate_toc' );

// 添加样式和脚本
function toc_enqueue_scripts() {
  wp_enqueue_style( 'toc-style', plugins_url( 'css/style.css', __FILE__ ) );
  wp_enqueue_script( 'toc-script', plugins_url( 'js/script.js', __FILE__ ), array( 'jquery' ), '1.0.0', true );
}
add_action( 'wp_enqueue_scripts', 'toc_enqueue_scripts' );

<!-- 在编辑器中显示目录树短代码按钮 -->
<script>
  function add_toc_shortcode_button() {
    if ( typeof wp !== 'undefined' && wp.hasOwnProperty( 'shortcode' ) ) {
      wp.mce = wp.mce || {};
      wp.mce.tinymce = wp.mce.tinymce || {};
      wp.mce.views = wp.mce.views || {};

      wp.mce.tinymce.Template = Backbone.Marionette.ItemView.extend({});

      $( document ).on( 'click', 'a.add-toc-shortcode', function(e) {
        e.preventDefault();
        wp.mce.views.getParentWindow().send_to_editor('[table_of_contents]');
      });
    }
  }
  $(document).ready(function() {
    add_toc_shortcode_button();
  });
</script>