WordPress/wp-admin/includes/revision.php

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<?php
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.
if ( $compare_from && $compare_from->post_parent !== $post->ID )
return false;
if ( $compare_to->post_parent !== $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 ) {
$content_from = $compare_from ? apply_filters( "_wp_post_revision_field_$field", $compare_from->$field, $field, $compare_from, 'left' ) : '';
$content_to = apply_filters( "_wp_post_revision_field_$field", $compare_to->$field, $field, $compare_to, 'right' );
$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;
}
function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null ) {
$post = get_post( $post );
$revisions = array();
$now_gmt = time();
$revisions = wp_get_post_revisions( $post->ID, array( 'order' => 'ASC' ) );
cache_users( wp_list_pluck( $revisions, 'post_author' ) );
foreach ( $revisions as $revision ) {
$modified = strtotime( $revision->post_modified );
$modified_gmt = strtotime( $revision->post_modified_gmt );
$restore_link = wp_nonce_url(
add_query_arg(
array( 'revision' => $revision->ID,
'action' => 'restore' ),
admin_url( 'revision.php' )
),
"restore-post_{$revision->ID}"
);
$revisions[ $revision->ID ] = array(
'id' => $revision->ID,
'title' => get_the_title( $post->ID ),
'author' => array(
'id' => (int) $revision->post_author,
'avatar' => get_avatar( $revision->post_author, 24 ),
'name' => get_the_author_meta( 'display_name', $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' => wp_is_post_autosave( $revision ),
'current' => $revision->post_modified_gmt === $post->post_modified_gmt,
'restoreUrl' => urldecode( $restore_link ),
);
}
// Now, grab the initial diff
$compare_two_mode = is_numeric( $from );
if ( ! $compare_two_mode ) {
$from = array_keys( array_slice( $revisions, array_search( $selected_revision_id, array_keys( $revisions ) ) - 1, 1, true ) );
$from = $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 ),
);
}