Gutenberg Audit for WordPress

gutenberg-audit.php

<?php
/*
   Plugin Name: Gutenberg Audit
   Plugin URI: http://highbrow.com.au/plugins/gutenberg-audit
   description: What blocks is your site using?
   Version: 0.1
   Author: Hugh Campbell
   Author URI: http://highbrow.com.au/
   License: GPL2
   */

function my_admin_menu()
{
  add_management_page(
    'Gutenberg audit',
    'Gutenberg audit',
    'manage_options',
    'gutenberg_audit',
    'gutenberg_audit_contents',
    'dashicons-schedule',
    3
  );
}

add_action('admin_menu', 'my_admin_menu');

function gutenberg_audit_contents()
{
?>
  <h1>
    <?php esc_html_e('List of all blocks in use.', 'my-plugin-textdomain'); ?>
  </h1>

  <?php
  $args = array(
    'sort_order' => 'asc',
    'sort_column' => 'post_title',
    'hierarchical' => 1,
    'exclude' => '',
    'include' => '',
    'meta_key' => '',
    'meta_value' => '',
    'authors' => '',
    'child_of' => 0,
    'parent' => -1,
    'exclude_tree' => '',
    'number' => '',
    'offset' => 0,
    'post_type' => 'page',
    'post_status' => 'publish'
  );
  $pages = get_pages($args); // get all pages based on supplied args

  $tally = [];
  $pageBreakdown = [];

  $recurseFunc = function ($page, $block) use (&$tally, &$pageBreakdown, &$recurseFunc) {
    $blockName = $block['blockName'];
    // echo "$blockName<br>";
    if (array_key_exists($blockName, $tally)) {
      $tally[$blockName]++;
    } else {
      $tally[$blockName] = 1;
    }
    if (!array_key_exists($page->post_title, $pageBreakdown)) {
      $pageBreakdown[$page->page_title] = [];
    }
    $pageList =  &$pageBreakdown[$page->post_title];
    
    if (array_key_exists($blockName, $pageList)) {
      $pageList[$blockName]++;
    } else {
      $pageList[$blockName] = 1;
    }
    //  print_r($tally);
    $inner = $block['innerBlocks'];
    foreach ($inner as $innerBlock) {
      $recurseFunc($page, $innerBlock);
    }
  };

  foreach ($pages as $page) { // $pages is array of object
    $blocks = parse_blocks($page->post_content);
    foreach ($blocks as $block) {
      $recurseFunc($page, $block);
    }
  }
  ?>
  <h2>
    Block Breakdown
  </h2>
  <ul>
    <?php
    foreach ($tally as $blocktype => $value) {
      echo sprintf('<li>%s - %s</li>', $blocktype, $value);
    }
    ?>
  </ul>

  <h2>
    Page Breakdown
  </h2>
  <?php
  foreach ($pageBreakdown as $page_title => $pageTally) {

  ?>
    <h2>
      <?= $page_title ?>
    </h2>
    <ul>

      <?php
      foreach ($pageTally as $blocktype => $value) {
        echo sprintf('<li>%s - %s</li>', $blocktype, $value);
      }
      ?>
    </ul>

<?php
  }
  //  echo wp_sprintf('tally %s', print_r($tally, true));
  //  echo wp_sprintf('pageList %s', print_r($pageBreakdown, true));

}