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* @access private

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* @global wpdb $wpdb WordPress database abstraction object.

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* @param WP_Post $post Post object.

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* @param array $revisions Current revisions of the post.

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* @return bool true if the revisions were upgraded, false if problems.

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function _wp_upgrade_revisions_of_post( $post, $revisions ) {

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global $wpdb;

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// Add post option exclusively.

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$lock = "revision-upgrade-{$post->ID}";

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$now = time();

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$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'off') /* LOCK */", $lock, $now ) );

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if ( ! $result ) {

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// If we couldn't get a lock, see how old the previous lock is.

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$locked = get_option( $lock );

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if ( ! $locked ) {

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* Can't write to the lock, and can't read the lock.

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* Something broken has happened.

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return false;

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}

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if ( $locked > $now - HOUR_IN_SECONDS ) {

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// Lock is not too old: some other process may be upgrading this post. Bail.

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return false;

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}

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// Lock is too old - update it (below) and continue.

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}

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// If we could get a lock, re-"add" the option to fire all the correct filters.

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update_option( $lock, $now );

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reset( $revisions );

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$add_last = true;

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do {

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$this_revision = current( $revisions );

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$prev_revision = next( $revisions );

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$this_revision_version = _wp_get_post_revision_version( $this_revision );

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// Something terrible happened.

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if ( false === $this_revision_version ) {

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continue;

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}

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* 1 is the latest revision version, so we're already up to date.

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* No need to add a copy of the post as latest revision.

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if ( 0 < $this_revision_version ) {

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$add_last = false;

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continue;

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}

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// Always update the revision version.

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$update = array(

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'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),

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);

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* If this revision is the oldest revision of the post, i.e. no $prev_revision,

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* the correct post_author is probably $post->post_author, but that's only a good guess.

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* Update the revision version only and Leave the author as-is.

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if ( $prev_revision ) {

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$prev_revision_version = _wp_get_post_revision_version( $prev_revision );

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// If the previous revision is already up to date, it no longer has the information we need :(

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if ( $prev_revision_version < 1 ) {

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$update['post_author'] = $prev_revision->post_author;

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}

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}

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// Upgrade this revision.

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$result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );

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if ( $result ) {

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wp_cache_delete( $this_revision->ID, 'posts' );

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}

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} while ( $prev_revision );

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delete_option( $lock );

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// Add a copy of the post as latest revision.

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if ( $add_last ) {

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wp_save_post_revision( $post->ID );

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}

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return true;

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}

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/**

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* Filters preview post meta retrieval to get values from the autosave.

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* Filters revisioned meta keys only.

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* @since 6.4.0

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* @param mixed $value Meta value to filter.

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* @param int $object_id Object ID.

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* @param string $meta_key Meta key to filter a value for.

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* @param bool $single Whether to return a single value. Default false.

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* @return mixed Original meta value if the meta key isn't revisioned, the object doesn't exist,

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* the post type is a revision or the post ID doesn't match the object ID.

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* Otherwise, the revisioned meta value is returned for the preview.

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function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) {

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$post = get_post();

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if (

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empty( $post ) ||

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$post->ID !== $object_id ||

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! in_array( $meta_key, wp_post_revision_meta_keys( $post->post_type ), true ) ||

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'revision' === $post->post_type

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) {

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return $value;

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}

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$preview = wp_get_post_autosave( $post->ID );

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if ( false === $preview ) {

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return $value;

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}

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return get_post_meta( $preview->ID, $meta_key, $single );

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}

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