some improvements

assets/css/activitypub-event-bridge-admin.css

@@ -7,7 +7,7 @@
 
 .activitypub-event-bridge-settings-page .box ul.activitypub-event-bridge-list {
 	list-style-type: disc;
-	margin-left: 1rem;
+	margin-left: 1.4rem;
 }
 
 .activitypub-event-bridge-settings-page .box pre {
@@ -65,3 +65,6 @@
 	font-size: 1.1rem!important;
 }
 
+#activitypub_event_bridge_initially_activated {
+	display: hidden;
+}

includes/admin/class-health-check.php

@@ -7,8 +7,10 @@
 
 namespace ActivityPub_Event_Bridge\Admin;
 
+use Activitypub\Transformer\Factory as Transformer_Factory;
+use ActivityPub_Event_Bridge\Plugins\Event_Plugin;
 use ActivityPub_Event_Bridge\Setup;
-use WP_Error;
+use WP_Query;
 
 /**
  * ActivityPub Health_Check Class.
@@ -76,6 +78,58 @@ class Health_Check {
 		return $result;
 	}
 
+	/**
+	 * Test if right transformer gets applied.
+	 *
+	 * @param Event_Plugin $event_plugin  The event plugin definition.
+	 *
+	 * @return bool True if the check passed.
+	 */
+	public static function test_if_event_transformer_is_used( $event_plugin ) {
+		// Get a (random) event post.
+		$event_posts = self::get_most_recent_event_posts( $event_plugin->get_post_type(), 1 );
+
+		// If no post is found, we can not do this test.
+		if ( ! $event_posts || is_wp_error( $event_posts ) || empty( $event_posts ) ) {
+			return true;
+		}
+
+		// Call the transformer Factory.
+		$transformer = Transformer_Factory::get_transformer( $event_posts[0] );
+		// Check that we got the right transformer.
+		$desired_transformer_class = $event_plugin::get_activitypub_event_transformer_class();
+		if ( $transformer instanceof $desired_transformer_class ) {
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * Retrieves the most recently published event posts of a certain event post type.
+	 *
+	 * @param string $event_post_type  The post type of the events.
+	 * @param int    $number_of_posts  The maximum number of events to return.
+	 *
+	 * @return WP_Post[]|false         Array of event posts, or false if none are found.
+	 */
+	public static function get_most_recent_event_posts( $event_post_type, $number_of_posts = 5 ) {
+		$args = array(
+			'numberposts'      => $number_of_posts,
+			'category'         => 0,
+			'orderby'          => 'date',
+			'order'            => 'DESC',
+			'include'          => array(),
+			'exclude'          => array(),
+			'meta_key'         => '',
+			'meta_value'       => '',
+			'post_type'        => $event_post_type,
+			'suppress_filters' => true,
+		);
+
+		$query = new WP_Query();
+		return $query->query( $args );
+	}
+
 	/**
 	 * Transform the most recent event posts.
 	 */

includes/admin/class-settings-page.php

@@ -91,7 +91,7 @@ class Settings_Page {
 	public static function settings_page(): void {
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
 		if ( empty( $_GET['tab'] ) ) {
-			$tab = 'status';
+			$tab = 'welcome';
 		} else {
 			// phpcs:ignore WordPress.Security.NonceVerification.Recommended
 			$tab = sanitize_key( $_GET['tab'] );
@@ -116,13 +116,13 @@ class Settings_Page {
 
 				\load_template( ACTIVITYPUB_EVENT_BRIDGE_PLUGIN_DIR . 'templates/settings.php', true, $args );
 				break;
-			case 'status':
+			case 'welcome':
 			default:
 				wp_enqueue_script( 'plugin-install' );
 				add_thickbox();
 				wp_enqueue_script( 'updates' );
 
-				\load_template( ACTIVITYPUB_EVENT_BRIDGE_PLUGIN_DIR . 'templates/status.php', true );
+				\load_template( ACTIVITYPUB_EVENT_BRIDGE_PLUGIN_DIR . 'templates/welcome.php', true );
 				break;
 		}
 	}

includes/class-settings.php

@@ -68,7 +68,7 @@ class Settings {
 			array(
 				'type'        => 'boolean',
 				'description' => \__( 'Whether the plugin just got activated for the first time.', 'activitypub' ),
-				'default'     => true,
+				'default'     => 1,
 			)
 		);
 	}

includes/class-setup.php

@@ -287,7 +287,7 @@ class Setup {
 	 * This method handles the activation of the ActivityPub Event Bridge plugin.
 	 *
 	 * @since 1.0.0
-	 *
+	 * @see register_activation_hook()
 	 * @return void
 	 */
 	public function activate(): void {

templates/admin-header.php

@@ -9,7 +9,7 @@
 $args = wp_parse_args(
 	$args,
 	array(
-		'status'   => '',
+		'welcome'  => '',
 		'settings' => '',
 	)
 );
@@ -21,8 +21,8 @@ $args = wp_parse_args(
 	</div>
 
 	<nav class="activitypub-event-bridge-settings-tabs-wrapper" aria-label="<?php \esc_attr_e( 'Secondary menu', 'activitypub-event-bridge' ); ?>">
-		<a href="<?php echo \esc_url( admin_url( 'options-general.php?page=activitypub-event-bridge' ) ); ?>" class="activitypub-event-bridge-settings-tab <?php echo \esc_attr( $args['status'] ); ?>">
-			<?php \esc_html_e( 'Status', 'activitypub-event-bridge' ); ?>
+		<a href="<?php echo \esc_url( admin_url( 'options-general.php?page=activitypub-event-bridge' ) ); ?>" class="activitypub-event-bridge-settings-tab <?php echo \esc_attr( $args['welcome'] ); ?>">
+			<?php \esc_html_e( 'Welcome', 'activitypub-event-bridge' ); ?>
 		</a>
 
 		<a href="<?php echo \esc_url( admin_url( 'options-general.php?page=activitypub-event-bridge&tab=settings' ) ); ?>" class="activitypub-event-bridge-settings-tab <?php echo \esc_attr( $args['settings'] ); ?>">

templates/settings.php

@@ -97,6 +97,10 @@ $current_category_mapping        = \get_option( 'activitypub_event_bridge_event_
 			</table>
 			<?php endif; ?>
 		</div>
+		<!-- This disables the setup wizard. -->
+		<div class="hidden">
+			<input type="checkbox" id="activitypub_event_bridge_initially_activated" name="activitypub_event_bridge_initially_activated"/>
+		</div>
 		<?php \submit_button(); ?>
 	</form>
 </div>

templates/welcome.php

@@ -9,12 +9,14 @@
 defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 
 use ActivityPub_Event_Bridge\Setup;
+use ActivityPub_Event_Bridge\Admin\Settings_Page;
+use ActivityPub_Event_Bridge\Admin\Health_Check;
 
 \load_template(
 	__DIR__ . '/admin-header.php',
 	true,
 	array(
-		'status' => 'active',
+		'welcome' => 'active',
 	)
 );
 
@@ -27,15 +29,34 @@ WP_Filesystem();
 
 <div class="activitypub-event-bridge-settings activitypub-event-bridge-settings-page hide-if-no-js">
 	<div class="box">
-		<h2><?php \esc_html_e( 'Welcome', 'activitypub-event-bridge' ); ?></h2>
+		<h2><?php \esc_html_e( 'Status', 'activitypub-event-bridge' ); ?></h2>
 		<p><?php \esc_html_e( 'The ActivityPub Event Bridge detected the following (activated) event plugins:', 'activitypub-event-bridge' ); ?></p>
 		<ul class="activitypub-event-bridge-list">
 			<?php foreach ( $active_event_plugins as $active_event_plugin ) { ?>
-				<li><?php echo esc_html( $active_event_plugin->get_plugin_name() ); ?> </li>
+				<li>
+					<strong><?php echo esc_html( $active_event_plugin->get_plugin_name() ); ?>:</strong>
+					<br>
+					<?php
+					if ( Health_Check::test_if_event_transformer_is_used( $active_event_plugin ) ) {
+						echo 'The ActivityPub Event Bridge successfully registered to the ActivityPub plugin.';
+					} else {
+						echo 'The ActivityPub Event Bridge could not register to the ActivityPub plugin.';
+					}
+					?>
+				</li>
 			<?php } ?>
 		</ul>
 	</div>
 
+	<?php if ( get_option( 'activitypub_event_bridge_initially_activated', true ) ) : ?>
+		<a href="<?php echo esc_url( admin_url( 'options-general.php?page=' . Settings_Page::SETTINGS_SLUG ) . '&tab=settings' ); ?>" role="button">
+			<button class="button button-primary">
+				<strong>→</strong> <?php \esc_html_e( 'Continue your setup', 'activitypub-event-bridge' ); ?>
+			</button>
+		</a>
+
+	<?php else : ?>
+
 	<div class="box">
 		<h2><?php \esc_html_e( 'Changelog', 'activitypub-event-bridge' ); ?></h2>
 		<pre>
@@ -45,5 +66,7 @@ WP_Filesystem();
 			?>
 		</pre>
 	</div>
+	<?php endif; ?>
+
 </div>