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<?php
/**
* WordPress Administration Revisions API
*
* @package WordPress
* @subpackage Administration
*/
/**
* Get the revision UI diff.
*
* @since 3.6.0
*
* @param object|int $post The post object. Also accepts a post ID.
* @param int $compare_from The revision ID to compare from.
* @param int $compare_to The revision ID to come to.
*
* @return array|bool Associative array of a post's revisioned fields and their diffs.
* Or, false on failure.
*/
function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {
if ( ! $post = get_post( $post ) )
return false;
if ( $compare_from ) {
if ( ! $compare_from = get_post( $compare_from ) )
return false;
} else {
// If we're dealing with the first revision...
$compare_from = false;
}
if ( ! $compare_to = get_post( $compare_to ) )
return false;
// If comparing revisions, make sure we're dealing with the right post parent.
// The parent post may be a 'revision' when revisions are disabled and we're looking at autosaves.
if ( $compare_from && $compare_from->post_parent !== $post->ID && $compare_from->ID !== $post->ID )
return false;
if ( $compare_to->post_parent !== $post->ID && $compare_to->ID !== $post->ID )
return false;
if ( $compare_from && strtotime( $compare_from->post_date_gmt ) > strtotime( $compare_to->post_date_gmt ) ) {
$temp = $compare_from;
$compare_from = $compare_to;
$compare_to = $temp;
}
// Add default title if title field is empty
if ( $compare_from && empty( $compare_from->post_title ) )
$compare_from->post_title = __( '(no title)' );
if ( empty( $compare_to->post_title ) )
$compare_to->post_title = __( '(no title)' );
$return = array();
foreach ( _wp_post_revision_fields() as $field => $name ) {
/**
* Contextually filter a post revision field.
*
* The dynamic portion of the hook name, $field, corresponds to each of the post
* fields of the revision object being iterated over in a foreach statement.
*
* @since 3.6.0
*
* @param string $compare_from->$field The current revision field to compare to or from.
* @param string $field The current revision field.
* @param WP_Post $compare_from The revision post object to compare to or from.
* @param string null The context of whether the current revision is the old or the new one. Values are 'to' or 'from'.
*/
$content_from = $compare_from ? apply_filters( "_wp_post_revision_field_$field", $compare_from->$field, $field, $compare_from, 'from' ) : '';
/** This filter is documented in wp-admin/includes/revision.php */
$content_to = apply_filters( "_wp_post_revision_field_$field", $compare_to->$field, $field, $compare_to, 'to' );
$diff = wp_text_diff( $content_from, $content_to, array( 'show_split_view' => true ) );
if ( ! $diff && 'post_title' === $field ) {
// It's a better user experience to still show the Title, even if it didn't change.
// No, you didn't see this.
$diff = '<table class="diff"><colgroup><col class="content diffsplit left"><col class="content diffsplit middle"><col class="content diffsplit right"></colgroup><tbody><tr>';
$diff .= '<td>' . esc_html( $compare_from->post_title ) . '</td><td></td><td>' . esc_html( $compare_to->post_title ) . '</td>';
$diff .= '</tr></tbody>';
$diff .= '</table>';
}
if ( $diff ) {
$return[] = array(
'id' => $field,
'name' => $name,
'diff' => $diff,
);
}
}
return $return;
}
/**
* Prepare revisions for JavaScript.
*
* @since 3.6.0
*
* @param object|int $post The post object. Also accepts a post ID.
* @param int $selected_revision_id The selected revision ID.
* @param int $from Optional. The revision ID to compare from.
*
* @return array An associative array of revision data and related settings.
*/
function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null ) {
$post = get_post( $post );
$authors = array();
$now_gmt = time();
$revisions = wp_get_post_revisions( $post->ID, array( 'order' => 'ASC', 'check_enabled' => false ) );
// If revisions are disabled, we only want autosaves and the current post.
if ( ! wp_revisions_enabled( $post ) ) {
foreach ( $revisions as $revision_id => $revision ) {
if ( ! wp_is_post_autosave( $revision ) )
unset( $revisions[ $revision_id ] );
}
$revisions = array( $post->ID => $post ) + $revisions;
}
$show_avatars = get_option( 'show_avatars' );
cache_users( wp_list_pluck( $revisions, 'post_author' ) );
$can_restore = current_user_can( 'edit_post', $post->ID );
$current_id = false;
foreach ( $revisions as $revision ) {
$modified = strtotime( $revision->post_modified );
$modified_gmt = strtotime( $revision->post_modified_gmt );
if ( $can_restore ) {
$restore_link = str_replace( '&', '&', wp_nonce_url(
add_query_arg(
array( 'revision' => $revision->ID,
'action' => 'restore' ),
admin_url( 'revision.php' )
),
"restore-post_{$revision->ID}"
) );
}
if ( ! isset( $authors[ $revision->post_author ] ) ) {
$authors[ $revision->post_author ] = array(
'id' => (int) $revision->post_author,
'avatar' => $show_avatars ? get_avatar( $revision->post_author, 32 ) : '',
'name' => get_the_author_meta( 'display_name', $revision->post_author ),
);
}
$autosave = (bool) wp_is_post_autosave( $revision );
$current = ! $autosave && $revision->post_modified_gmt === $post->post_modified_gmt;
if ( $current && ! empty( $current_id ) ) {
// If multiple revisions have the same post_modified_gmt, highest ID is current.
if ( $current_id < $revision->ID ) {
$revisions[ $current_id ]['current'] = false;
$current_id = $revision->ID;
} else {
$current = false;
}
} elseif ( $current ) {
$current_id = $revision->ID;
}
$revisions[ $revision->ID ] = array(
'id' => $revision->ID,
'title' => get_the_title( $post->ID ),
'author' => $authors[ $revision->post_author ],
'date' => date_i18n( __( 'M j, Y @ G:i' ), $modified ),
'dateShort' => date_i18n( _x( 'j M @ G:i', 'revision date short format' ), $modified ),
'timeAgo' => sprintf( __( '%s ago' ), human_time_diff( $modified_gmt, $now_gmt ) ),
'autosave' => $autosave,
'current' => $current,
'restoreUrl' => $can_restore ? $restore_link : false,
);
}
/*
* If a post has been saved since the last revision (no revisioned fields
* were changed), we may not have a "current" revision. Mark the latest
* revision as "current".
*/
if ( empty( $current_id ) ) {
if ( $revisions[ $revision->ID ]['autosave'] ) {
$revision = end( $revisions );
while ( $revision['autosave'] ) {
$revision = prev( $revisions );
}
$current_id = $revision['id'];
} else {
$current_id = $revision->ID;
}
$revisions[ $current_id ]['current'] = true;
}
// Now, grab the initial diff.
$compare_two_mode = is_numeric( $from );
if ( ! $compare_two_mode ) {
$found = array_search( $selected_revision_id, array_keys( $revisions ) );
if ( $found ) {
$from = array_keys( array_slice( $revisions, $found - 1, 1, true ) );
$from = reset( $from );
} else {
$from = 0;
}
}
$from = absint( $from );
$diffs = array( array(
'id' => $from . ':' . $selected_revision_id,
'fields' => wp_get_revision_ui_diff( $post->ID, $from, $selected_revision_id ),
));
return array(
'postId' => $post->ID,
'nonce' => wp_create_nonce( 'revisions-ajax-nonce' ),
'revisionData' => array_values( $revisions ),
'to' => $selected_revision_id,
'from' => $from,
'diffData' => $diffs,
'baseUrl' => parse_url( admin_url( 'revision.php' ), PHP_URL_PATH ),
'compareTwoMode' => absint( $compare_two_mode ), // Apparently booleans are not allowed
'revisionIds' => array_keys( $revisions ),
);
}
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