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Add relational links to next/prev/parent posts. See #8703 props sivel. 

git-svn-id: http://svn.automattic.com/wordpress/trunk@10815 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
westi 2009-03-18 21:56:03 +00:00
parent 5258242b98
commit d6df5b55c9
2 changed files with 240 additions and 0 deletions
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4
wp-includes/default-filters.php
View File

@ -168,6 +168,10 @@ add_action('wp_head', 'wp_enqueue_scripts', 1);
add_action('wp_head', 'feed_links_extra', 3);
add_action('wp_head', 'rsd_link');
add_action('wp_head', 'wlwmanifest_link');
add_action('wp_head', 'index_rel_link');
add_action('wp_head', 'parent_post_rel_link', 10, 0);
add_action('wp_head', 'start_post_rel_link', 10, 0);
add_action('wp_head', 'adjacent_posts_rel_link', 10, 0);
add_action('wp_head', 'locale_stylesheet');
add_action('publish_future_post', 'check_and_publish_future_post', 10, 1);
add_action('wp_head', 'noindex', 1);

236
wp-includes/link-template.php
View File

@ -908,6 +908,242 @@ function get_adjacent_post($in_same_cat = false, $excluded_categories = '', $pre
return $wpdb->get_row("SELECT p.* FROM $wpdb->posts AS p $join $where $sort");
}
/**
* Get adjacent post relational link.
*
* Can either be next or previous post relational link.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
* @param bool $previous Optional, default is true. Whether display link to previous post.
* @return string
*/
function get_adjacent_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $previous = true) {
if ( $previous && is_attachment() )
$post = & get_post($GLOBALS['post']->post_parent);
else
$post = get_adjacent_post($in_same_cat,$excluded_categories,$previous);
if ( empty($post) )
return;
if ( empty($post->post_title) )
$post->post_title = $previous ? __('Previous Post') : __('Next Post');
$date = mysql2date(get_option('date_format'), $post->post_date);
$title = str_replace('%title', $post->post_title, $title);
$title = str_replace('%date', $date, $title);
$title = apply_filters('the_title', $title, $post);
$link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='";
$link .= $title;
$link .= "' href='" . get_permalink($post) . "' />\n";
$adjacent = $previous ? 'previous' : 'next';
return apply_filters( "{$adjacent}_post_rel_link", $link );
}
/**
* Display relational links for the posts adjacent to the current post.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
*/
function adjacent_posts_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', true);
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', false);
}
/**
* Display relational link for the next post adjacent to the current post.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
*/
function next_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', false);
}
/**
* Display relational link for the previous post adjacent to the current post.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
*/
function prev_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', true);
}
/**
* Retrieve boundary post.
*
* Boundary being either the first or last post by publish date within the contraitns specified
* by in same category or excluded categories.
*
* @since 2.8.0
*
* @param bool $in_same_cat Optional. Whether returned post should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
* @param bool $previous Optional. Whether to retrieve first post.
* @return object
*/
function get_boundary_post($in_same_cat = false, $excluded_categories = '', $start = true) {
global $post, $wpdb;
if( empty($post) || !is_single() || is_attachment() )
return null;
$cat_array = array();
$excluded_categories = array();
if ( !empty($in_same_cat) || !empty($excluded_categories) ) {
if ( !empty($in_same_cat) ) {
$cat_array = wp_get_object_terms($post->ID, 'category', 'fields=ids');
}
if ( !empty($excluded_categories) ) {
$excluded_categories = array_map('intval', explode(',', $excluded_categories));
if ( !empty($cat_array) ) {
$excluded_categories = array_diff($excluded_categories, $cat_array);
}
$inverse_cats = array();
foreach ( $excluded_categories as $excluded_category) {
$inverse_cats[] = $excluded_category * -1;
}
$excluded_categories = $inverse_cats;
}
}
$categories = array_merge($cat_array, $excluded_categories);
$order = $start ? 'ASC' : 'DESC';
return get_posts("numberposts=1&order=$order&orderby=ID&category=$categories");
}
/**
* Get boundary post relational link.
*
* Can either be start or end post relational link.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
* @param bool $start Optional, default is true. Whether display link to first post.
* @return string
*/
function get_boundary_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $start = true) {
$posts = get_boundary_post($in_same_cat,$excluded_categories,$start);
// Even though we limited get_posts to return only 1 item it still returns an array of objects.
$post = $posts[0];
if ( empty($post) )
return;
if ( empty($post->post_title) )
$post->post_title = $start ? __('First Post') : __('Last Post');
$date = mysql2date(get_option('date_format'), $post->post_date);
$title = str_replace('%title', $post->post_title, $title);
$title = str_replace('%date', $date, $title);
$title = apply_filters('the_title', $title, $post);
$link = $start ? "<link rel='start' title='" : "<link rel='end' title='";
$link .= $title;
$link .= "' href='" . get_permalink($post) . "' />\n";
$boundary = $start ? 'start' : 'end';
return apply_filters( "{$boundary}_post_rel_link", $link );
}
/**
* Display relational link for the first post.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
*/
function start_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_boundary_post_rel_link($title, $in_same_cat, $excluded_categories, true);
}
/**
* Get site index relational link.
*
* @since 2.8.0
*
* @return string
*/
function get_index_rel_link() {
$link = "<link rel='index' title='" . get_bloginfo('name') . "' href='" . get_bloginfo('siteurl') . "' />\n";
return apply_filters( "index_rel_link", $link );
}
/**
* Display relational link for the site index.
*
* @since 2.8.0
*/
function index_rel_link() {
echo get_index_rel_link();
}
/**
* Get parent post relational link.
*
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @return string
*/
function get_parent_post_rel_link($title = '%title') {
if ( ! empty( $GLOBALS['post'] ) && ! empty( $GLOBALS['post']->post_parent ) )
$post = & get_post($GLOBALS['post']->post_parent);
if ( empty($post) )
return;
$date = mysql2date(get_option('date_format'), $post->post_date);
$title = str_replace('%title', $post->post_title, $title);
$title = str_replace('%date', $date, $title);
$title = apply_filters('the_title', $title, $post);
$link = "<link rel='up' title='";
$link .= $title;
$link .= "' href='" . get_permalink($post) . "' />\n";
return apply_filters( "parent_post_rel_link", $link );
}
/**
* Display relational link for parent item
*
* @since 2.8.0
*/
function parent_post_rel_link($title = '%title') {
echo get_parent_post_rel_link($title);
}
/**
* Display previous post link that is adjacent to the current post.
*