Add support for 'include' and 'exclude' to [gallery] (include="123,456" would show only these attachments regardless of the parent post, exclude="789,123" would exclude these attachments and show the rest).

git-svn-id: http://svn.automattic.com/wordpress/trunk@11771 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -661,11 +661,27 @@ function gallery_shortcode($attr) {
 		'icontag'    => 'dt',
 		'captiontag' => 'dd',
 		'columns'    => 3,
-		'size'       => 'thumbnail'
+		'size'       => 'thumbnail',
+		'include'    => '',
+		'exclude'    => ''
 	), $attr));
 
 	$id = intval($id);
-	$attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+	if ( 'RAND' == $order )
+		$orderby = 'none';
+
+	if ( !empty($include) ) {
+		$_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+
+		$attachments = array();
+		foreach ( $_attachments as $key => $val ) {
+			$attachments[$val->ID] = $_attachments[$key];
+		}
+	} elseif ( !empty($exclude) ) {
+		$attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+	} else {
+		$attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+	}
 
 	if ( empty($attachments) )
 		return '';