Add custom capabilities for the Learn post types

Copied from the Learn plugin: WPOrg_Learn\Capabilities

wp-content/themes/pub/wporg-learn-2024/functions.php

@@ -7,6 +7,11 @@
  */
 require __DIR__ . '/inc/admin.php';
 
+/**
+ * Capabilities.
+ */
+require __DIR__ . '/inc/capabilities.php';
+
 /**
  * Taxonomies.
  */

wp-content/themes/pub/wporg-learn-2024/inc/capabilities.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace WordPressdotorg\Theme\Learn_2024\Capabilities;
+
+defined( 'WPINC' ) || die();
+
+/**
+ * Actions and filters.
+ */
+add_filter( 'map_meta_cap', __NAMESPACE__ . '\map_meta_caps', 20, 4 ); // Needs to fire after meta caps in wporg-internal-notes.
+
+/**
+ * Map primitive caps to our custom caps.
+ *
+ * @param array  $required_caps
+ * @param string $current_cap
+ * @param int    $user_id
+ * @param mixed  $args
+ *
+ * @return mixed
+ */
+function map_meta_caps( $required_caps, $current_cap, $user_id, $args ) {
+	switch ( $current_cap ) {
+		case 'edit_any_learn_content':
+			$required_caps       = array();
+			$learn_content_types = array( 'course', 'lesson', 'meeting' );
+
+			// Grant `edit_any_learn_content` when the user has `edit_posts` for any of the learn post types.
+			foreach ( $learn_content_types as $post_type ) {
+				$object = get_post_type_object( $post_type );
+				if ( user_can( $user_id, $object->cap->edit_posts ) ) {
+					$required_caps[] = $object->cap->edit_posts;
+					break 2; // Breaks out of the foreach and the switch.
+				}
+			}
+
+			$required_caps[] = 'do_not_allow';
+			break;
+	}
+
+	return $required_caps;
+}

wp-content/themes/pub/wporg-learn-2024/inc/taxonomy.php

@@ -54,7 +54,7 @@ function register_experience_level() {
 		'show_tagcloud'     => false,
 		'show_in_rest'      => true,
 		'capabilities'      => array(
-			'assign_terms' => 'edit_lessons',
+			'assign_terms' => 'edit_any_learn_content', // See WordPressdotorg\Theme\Learn_2024\Capabilities\map_meta_caps.
 		),
 	);