Add default content for completely reproducible website

[geerlingguy]

As the title says; basically add the default_content module, then add default nodes and a default admin user so I can have the entire site (including nodes) be reproducible inside the repository.

This may or may not be the best idea—otherwise I could create the content in a CSV or something and use Migrate to import after install...

[geerlingguy]

Have to create menu links manually in a hook_install()... but other than that most things seem to be coming along nicely here. I'm doing this work alongside #3, so I can have some content to theme.

[geerlingguy]

In the previous, commit, I'm calling the following function from within hook_install(), but it seems to not take effect... like after installation, config is imported and/or content is created and all the menu links are wiped out for some reason:

/**
 * Custom function to create menu links, until default_content can export them.
 *
 * @see https://www.drupal.org/project/default_content/issues/2885285
 * @see https://www.drupal.org/project/drupal/issues/2577923
 */
function _pidramble_default_content_create_menu_links() {
  $items = [
    [
      'uri' => 'route:<front>',
      'title' => 'Home',
      'weight' => 0,
    ],
    [
      'uri' => 'internal:/node/5',
      'title' => 'Wiki',
      'weight' => 5,
    ],
    [
      'uri' => 'internal:/node/2',
      'title' => 'About',
      'weight' => 10,
    ],
  ];

  foreach($items as $item) {
    $menu_link = MenuLinkContent::create([
      'title' => $item['title'],
      'link' => ['uri' => $item['uri']],
      'weight' => $item['weight'],
      'menu_name' => 'main',
      'expanded' => TRUE,
    ]);
    $menu_link->save();
  }
}

I'm trying to figure out if there's a way I can get these menu links to exist immediately following a fresh installation...

[geerlingguy]

As it turns out, the Default Content module creates a Drupal\default_content\Event\ImportEvent that I can subscribe to. So in the commit above I added the class ImportEventSubscriber, which basically waits for that event, then creates the menu items (it seems the menu item creation fails when I implement it directly in hook_install().

So, yay!

Need to document this now.