LearnDash Partial Support for Permalink Manager

permalink-manager-learndash.php

<?php
/**
 * Fix lesson query if "Nested URLs" are enabled (add original course name to the query)
 */
function pm_query_lesson_url( $query, $old_query = '' ) {
	global $wpdb, $wp, $pm_query;

	if ( empty( $wp->request ) ) {
		return $query;
	}

	$lesson_cpt_slug = pm_get_ldms_rewrite_slug( 'lesson' );

	// A. Detect nested lesson URLs
	if ( strpos( $wp->request, "/{$lesson_cpt_slug}/" ) !== false ) {
		preg_match( "/([^\/]+)\/{$lesson_cpt_slug}\/([^\/]+)(?:.+?([^\/]+)$)?/", $wp->request, $parts );

		if ( ! empty( $parts[2] ) ) {
			$query = array(
				'do_not_redirect' => 1,
				'sfwd-courses'    => $parts[1],
				'sfwd-lessons'    => $parts[2],
				'name'            => $parts[2],
				'post_type'       => 'sfwd-lessons'
			);
		}

		if ( ! empty( $parts[3] ) ) {
			$topic_quiz = sanitize_title( $parts[3] );
			$post_type  = $wpdb->get_var( $wpdb->prepare( "SELECT post_type FROM {$wpdb->posts} WHERE post_name = %s", $topic_quiz ) );

			if ( ! empty( $post_type ) && in_array( $post_type, array( 'sfwd-topic', 'sfwd-quiz' ) ) ) {
				$query[ $post_type ] = $topic_quiz;
				$query['post_type']  = $post_type;
			}
		}
	} // B. Check if requested slug is used by any lesson/topic/quiz
	else if ( strpos( $wp->request, "/" ) === false ) {
		$lesson = $wpdb->get_row( $wpdb->prepare( "
			SELECT * FROM {$wpdb->posts}
			WHERE post_name = %s
			AND post_type IN ('sfwd-lessons', 'sfwd-topic', 'sfwd-quiz')
			", basename( $wp->request ) ) );

		if ( ! empty( $lesson->post_type ) ) {
			$course_id   = learndash_get_course_id( $lesson->ID );
			$course_name = get_post_field( 'post_name', $course_id );

			$query = array(
				$lesson->post_type => $lesson->post_name,
				'name'             => $lesson->post_name,
				'post_type'        => $lesson->post_type
			);

			if ( ! empty( $course_name ) ) {
				$query['sfwd-courses']    = $course_name;
				$query['do_not_redirect'] = 1;
			} else {
				$query['do_not_redirect'] = 1;
			}
		}
	}

	return $query;
}

add_filter( 'request', 'pm_query_lesson_url', 10, 2 );

/**
 * Get rewrite slug for 'lesson'
 */
function pm_get_ldms_rewrite_slug( $post_type = '' ) {
	if ( function_exists( 'learndash_get_post_type_slug' ) && ! empty( $post_type ) ) {
		$lesson_cpt_slug = learndash_get_post_type_slug( 'lesson' );
		$lesson_cpt_obj  = get_post_type_object( $lesson_cpt_slug );
		$lesson_cpt_slug = apply_filters( 'learndash_post_type_rewrite_slug', $lesson_cpt_obj->rewrite['slug'], $lesson_cpt_slug );
	} else {
		$lesson_cpt_slug = $post_type;
	}

	return $lesson_cpt_slug;
}

/**
 * Add course URL to lesson URL if "Nested URLs" are enabled
 */
function pm_append_course_name( $permalink, $post ) {
	if ( empty( $post->post_type ) ) {
		return $permalink;
	}

	// Get the dynamically generated course name
	if ( in_array( $post->post_type, array( 'sfwd-lessons', 'sfwd-topic', 'sfwd-quiz' ) ) && function_exists( 'learndash_get_course_id' ) ) {
		// Keep the old permalink in a separate variable
		$old_permalink  = $permalink;
		$permalink_base = trim( get_option( 'home' ), "/" );

		$course_id = apply_filters( 'learndash_post_link_course_id', learndash_get_course_id( $post->ID ), $old_permalink, $post );

		if ( ! empty( $course_id ) ) {
			$course_name     = get_post_field( 'post_name', $course_id );
			$lesson_cpt_slug = pm_get_ldms_rewrite_slug( 'lesson' );
		}

		// A. Change 'Lesson' permalink
		if ( $post->post_type == 'sfwd-lessons' ) {
			$sfwd_lessons = get_post_meta( $post->ID, '_sfwd-lessons', true );

			if ( ! empty( $course_name ) && empty( $sfwd_lessons['sfwd-lessons_sample_lesson'] ) ) {
				$new_permalink = sprintf( '%s/%s/%s/%s', $permalink_base, $course_name, $lesson_cpt_slug, $post->post_name );
			} else {
				$new_permalink = sprintf( '%s/%s', $permalink_base, $post->post_name );
			}
		}

		// B. Change 'Topic' & 'Quiz' permalink
		if ( in_array( $post->post_type, array( 'sfwd-topic', 'sfwd-quiz' ) ) && ! empty( $course_name ) && class_exists( 'LearnDash_Settings_Section' ) ) {
			if ( LearnDash_Settings_Section::get_section_setting( 'LearnDash_Settings_Courses_Builder', 'shared_steps' ) == 'yes' && function_exists( 'learndash_course_get_single_parent_step' ) ) {
				$lesson_id = learndash_course_get_single_parent_step( $course_id, $post->ID );
			} else if ( function_exists( 'learndash_get_lesson_id' ) ) {
				$lesson_id = learndash_get_lesson_id( $post->ID );
			}

			$sfwd_lessons = get_post_meta( $lesson_id, '_sfwd-lessons', true );

			if ( ! empty( $lesson_id ) ) {
				$lesson_name = get_post_field( 'post_name', $lesson_id );

				if ( empty( $sfwd_lessons['sfwd-lessons_sample_lesson'] ) ) {
					$new_permalink = sprintf( '%s/%s/%s/%s/%s', $permalink_base, $course_name, $lesson_cpt_slug, $lesson_name, $post->post_name );
				} else {
					$new_permalink = sprintf( '%s/%s/%s', $permalink_base, $lesson_name, $post->post_name );
				}
			}
		}
	}

	return ( ! empty( $new_permalink ) ) ? user_trailingslashit( $new_permalink ) : $permalink;
}

add_filter( 'post_type_link', 'pm_append_course_name', 150, 3 );