Ticket #24908: 24908.3.diff

wp-admin/includes/revision.php

@@ -73 +73 @@
                 /** 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 ) );
+                /**
+                 * Filter revisions table structure.
+                 *
+                 * Specify revision comparison table as default split (two columns) or not split (single column).
+                 *
+                 * @since 3.8.0
+                 * @param boolean null Whether to display revisions in a split view.
+                 */
+                $show_split_view = apply_filters( 'show_revisions_split_view', true );
+                $diff = wp_text_diff( $content_from, $content_to, array( 'show_split_view' => $show_split_view ) );
 
                 if ( ! $diff && 'post_title' === $field ) {
                         // It's a better user experience to still show the Title, even if it didn't change.

wp-includes/wp-diff.php

@@ -154 +154 @@
                 $r = '';
                 foreach ($lines as $line) {
                         if ( $encode )
-                                $line = htmlspecialchars( $line );
+
+                                /**
+                                 * Contextually filter a diffed line.
+                                 *
+                                 * Filters TextDiff default application of htmlspecialchars to the returned html for
+                                 * all diff calculations. This filter is passed the unfiltered html and the context:
+                                 * 'added', 'deleted' or 'context' (unchanged).
+                                 *
+                                 * @since 3.8.0
+                                 * @param String $line The unfiltered diffed line.
+                                 * @param string null  The lines context. Values are 'added', 'deleted' or 'context' (unchanged).
+                                 */
+                                $line = apply_filters( 'process_text_diff_html', htmlspecialchars( $line ), $line, 'added' );
                         if ( $this->_show_split_view ) {
                                 $r .= '<tr>' . $this->emptyLine() . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
                         } else {
@@ -176 +188 @@
                 $r = '';
                 foreach ($lines as $line) {
                         if ( $encode )
-                                $line = htmlspecialchars( $line );
+                                /** This filter is documented in /wp-includes/wp-diff.php */
+                                $line = apply_filters( 'process_text_diff_html', htmlspecialchars( $line ), $line, 'deleted' );
                         if ( $this->_show_split_view ) {
                                 $r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . $this->emptyLine() . "</tr>\n";
                         } else {
@@ -199 +212 @@
                 $r = '';
                 foreach ($lines as $line) {
                         if ( $encode )
-                                $line = htmlspecialchars( $line );
+                                /** This filter is documented in /wp-includes/wp-diff.php */
+                                $line = apply_filters( 'process_text_diff_html', htmlspecialchars( $line ), $line, 'context' );
                         if (  $this->_show_split_view ) {
                                 $r .= '<tr>' . $this->contextLine( $line ) . $this->emptyLine() . $this->contextLine( $line )  . "</tr>\n";
                         } else {