Ticket #4209: 4209-nextgen.diff

wp-includes/default-filters.php

@@ -160 +160 @@
 add_action('wp_head', 'locale_stylesheet');
 add_action('publish_future_post', 'wp_publish_post', 10, 1);
 add_action('wp_head', 'noindex', 1);
+add_action( 'wp_head', 'link_rel_prev_next' );
 add_action('wp_head', 'wp_print_scripts');
 if(!defined('DOING_CRON'))
         add_action('init', 'wp_cron');

wp-includes/link-template.php

@@ -352 +352 @@
 
 // Navigation links
 
-function get_previous_post($in_same_cat = false, $excluded_categories = '') {
-        global $post, $wpdb;
+function get_previous_post($in_same_cat = false, $excluded_categories = '', $id = 0) {
+        global $wpdb;
+        
+        $post = &get_post( $id );
 
         if( !is_single() || is_attachment() )
                 return null;
@@ -389 +391 @@
         return @$wpdb->get_row("SELECT ID, post_title FROM $wpdb->posts $join $where $sort");
 }
 
-function get_next_post($in_same_cat = false, $excluded_categories = '') {
-        global $post, $wpdb;
+function get_next_post($in_same_cat = false, $excluded_categories = '', $id = 0) {
+        global $wpdb;
+        
+        $post = &get_post( $id );
 
         if( !is_single() || is_attachment() )
                 return null;
@@ -438 +442 @@
                 return;
 
         $title = apply_filters('the_title', $post->post_title, $post);
-        $string = '<a href="'.get_permalink($post->ID).'">';
+        $string = '<a href="'.get_permalink($post->ID).'" rel="prev">';
         $link = str_replace('%title', $title, $link);
         $link = $pre . $string . $link . '</a>';
 
@@ -454 +458 @@
                 return;
 
         $title = apply_filters('the_title', $post->post_title, $post);
-        $string = '<a href="'.get_permalink($post->ID).'">';
+        $string = '<a href="'.get_permalink($post->ID).'" rel="next">';
         $link = str_replace('%title', $title, $link);
         $link = $string . $link . '</a>';
         $format = str_replace('%link', $link, $format);
@@ -607 +611 @@
         }
 }
 
-?>
+function link_rel_prev_next( $id = 0 ) {
+        if ( !is_single() ) {
+                return;
+        }
+        
+        $prev_url = '';
+        $next_url = '';
+        
+        $post = get_post( $id );
+        setup_postdata( $post );
+        
+        global $multipage, $numpages, $pagenow, $page, $wp_rewrite;
+        
+        if ( $multipage ) {
+                global $numpages, $pagenow, $page;
+                
+                if ( $page == 1 ) {
+                        if ( $prev_post = get_previous_post( false, '', $post->ID ) ) {
+                                $prev_url = get_permalink( $prev_post->ID );
+                        }
+                } else {
+                        if ( !$wp_rewrite->using_permalinks() || $post->post_status == 'draft' ) {
+                                $prev_url = add_query_arg( 'page', $page - 1, get_permalink() );
+                        } else {
+                                $prev_url = trailingslashit( get_permalink() ) . user_trailingslashit( $page - 1, 'single_paged' );
+                        }
+                }
+                
+                if ( $page == $numpages ) {
+                        if ( $next_post = get_next_post( false, '', $post->ID ) ) {
+                                $next_url = get_permalink( $next_post->ID );
+                        }
+                } else {
+                        if ( !$wp_rewrite->using_permalinks() || $post->post_status == 'draft' ) {
+                                $next_url = add_query_arg( 'page', $page + 1, get_permalink( $post->ID ) );
+                        } else {
+                                $next_url = trailingslashit( get_permalink() ) . user_trailingslashit( $page + 1, 'single_paged' );
+                        }
+                }
+        } else {
+                if ( $prev_post = get_previous_post( false, '', $post->ID ) ) {
+                        $prev_url = get_permalink( $prev_post->ID );
+                }
+                
+                if ( $next_post = get_next_post( false, '', $post->ID ) ) {
+                        $next_url = get_permalink( $next_post->ID );
+                }
+        }
+        
+        if ( !empty( $prev_url ) ) {
+                printf( '<link rel="prev" href="%s" />' . "\n", $prev_url );
+        }
+        
+        if ( !empty( $next_url ) ) {
+                printf( '<link rel="next" href="%s" />' . "\n", $next_url );
+        }
+}                       
+
+?>
+ No newline at end of file