thumb_url) ) {
$link_text = '.')
';
return '';
}
return $excerpt;
}
add_filter('get_the_excerpt', 'nautilus_get_the_excerpt');
function nautilus_post_class($classes) {
global $post;
$_post_id = intval($post->ID);
if ( is_archive() && $_post_id ) {
if ( $post->thumb_url )
$classes[] = 'has-thumbnail';
}
return $classes;
}
add_filter('post_class', 'nautilus_post_class');
// get the thumbnail of the first attachment of a post
function nautilus_get_post_thumbnail($post_id) {
$thumb_url = wp_cache_get($post_id, 'post_thumbs');
if ( false !== $thumb_url ) {
return $thumb_url;
}
else {
$thumb_url = '';
$rows =& get_children("post_parent={$post_id}&post_type=attachment&numberposts=1");
if ( $rows ) {
$attachment = array_shift($rows);
$thumb_url = wp_get_attachment_thumb_url($attachment->ID);
}
wp_cache_add($post_id, $thumb_url, 'post_thumbs');
return $thumb_url;
}
}
function nautilus_clean_post_cache($post_id) {
wp_cache_delete($post_id, 'post_thumbs');
}
// on archive pages, reorder the posts array to group thumbnails and non-thumbnails
function nautilus_the_posts($posts) {
if ( is_archive() ) {
$with_thumbs = array();
$no_thumbs = array();
foreach ($posts as $post) {
$thumb_url = nautilus_get_post_thumbnail($post->ID);
if ( $thumb_url ) {
$post->thumb_url = $thumb_url;
$with_thumbs[] = $post;
}
else {
$no_thumbs[] = $post;
}
}
$posts = array_merge($with_thumbs, $no_thumbs);
}
return $posts;
}
add_filter('the_posts', 'nautilus_the_posts');
?>