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<?php

/**
 * Store the Content Manger meta in the revision.
 *
 * @param $post_id
 * @param $post
 */
function cma_revisions_save_post($post_id, $post) {
    $parent_id = wp_is_post_revision($post_id);
    
    if ($parent_id) {
        // If the layout data meta exists, copy it into the revision.

        if (isset($_POST['cma_layout_data']) && !empty($_POST['cma_layout_data'])) {
            $layout_data = $_POST['cma_layout_data'];
        } else {
            $parent = get_post($parent_id);
            $layout_data = get_post_meta($parent->ID, 'cma_layout_data', true);
            
        }

        if (!empty($layout_data)) {            
            add_metadata('post', $post_id, 'cma_layout_data', $layout_data);
        }
    }
}

add_action('save_post', 'cma_revisions_save_post', 11, 2);

/**
 * Restore a revision when requested.
 *
 * @param $post_id
 * @param $revision_id
 */
function cma_revisions_restore($post_id, $revision_id) {
    $layout_data = get_metadata('post', $revision_id, 'cma_layout_data', true);

    // update meta data
    if (!empty($layout_data)) {
        $layout_data = wp_slash($layout_data);
        update_post_meta($post_id, 'cma_layout_data', $layout_data);
    } else {
        delete_post_meta($post_id, 'cma_layout_data');
    }
}

add_action('wp_restore_post_revision', 'cma_revisions_restore', 10, 2);