Sync a directory of static html pages with Wordpress

page-sync.php

<?php
$dir = '/var/www/html';
if (getenv('WORDPRESS_PATH')) {
  $dir = getenv('WORDPRESS_PATH');
}
require_once($dir . '/wp-load.php');

class PageSync
{
  public static function export() {
    $pages = get_pages();
    foreach ($pages as $page) {
      self::export_page($page);
    }
  }

  public static function import() {
    $dir = new DirectoryIterator(getenv('SYNC_PATH'));
    foreach ($dir as $fileinfo) {
      if (!$fileinfo->isDot()) {
        self::import_page($fileinfo);
      }
    }
  }

  private static function export_page($page) {
    $filename = $page->post_name . '.html';
    $target = getenv('SYNC_PATH') . '/' . $filename;
    $file = fopen($target, 'w');
    fwrite($file, $page->post_content);
    fclose($file);
  }

  private static function import_page($fileinfo) {
    $name = $fileinfo->getBasename('.' . $fileinfo->getExtension());
    $pages = get_posts(['name' => $name, 'post_type' => 'page',
                        'posts_per_page' => 1, 'caller_get_posts' => 1]);
    if (!empty($pages)) {
      $file = fopen($fileinfo->getPathname(), 'r');
      $contents = fread($file, filesize($fileinfo->getPathname()));
      fclose($file);
      $page = $pages[0];
      wp_update_post(['ID' => $page->ID, 'post_content' => $contents]);
    }
  }
}

class PageSyncCli
{
  public static function run($args) {
    if (!isset($args[1])) {
      self::fail();
    }
    $action = $args[1];
    if ($action == 'export') {
      PageSync::export();
    } else if ($action == 'import') {
      PageSync::import();
    } else {
      self::fail();
    }
  }

  public static function fail() {
    $usage = "usage: php page-sync.php [import|export]\n";
    die($usage);
  }
}

PageSyncCli::run($argv);
?>