Book feed

I'd like this.

The patch is probably broken by now; I'll test it shortly.

still applies with a lot of offset, won't get into D6 though.

drupal_add_css() no longer goes in !may_cache - also this would be quite easy to do in views. Since views may end up in core in D7, I'd rather see this dealt with alongside node_type views and rss feeds.

A book feed should be standard functionality, like a group feed, taxonomy feeds, etc.

I reworked the code in the patch above for drupal 6 (see below). There's only one big problem, the book feeds seem to show only one item (the first bookpage from that point in the hierarchy). Anyone?

---

If you want to add feeds per book, do the following.

In book.module, below

     'attributes' => array('title' => t('Show a printer-friendly version of this book page and its sub-pages.'))
         );
       }

add

      if (user_access('access content')) {
        $links['book_feed'] = array(
          'title' => t('Feed'),
          'href' => 'book/feed/'. $node->nid,
          'attributes' => array('title' => t('Access a feed of all changes below that page in the book hierarchy.'))
        );
      }
     }
   }

(this makes the link to the feed appear)

below

 'access arguments' => array('access printer-friendly version'),
     'type' => MENU_CALLBACK,
      'file' => 'book.pages.inc',
   );

add

  $items['book/feed/%'] = array(
    'page callback' => 'book_feed',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'file' => 'book.pages.inc',
  );

(this makes the link call the bookfeed-function)

Now add the bookfeed function to the file book.pages.inc:

/**
 * Ancillary PRE function for book_feed
 *
 * @param $node
 *   The node object being traversed
 */
function _book_feed_pre($node) {
  $pubDate = date(DATE_RSS, $node->changed);
  return format_rss_item(
    $node->title,
    url("node/$node->nid", array('absolute' => TRUE)),
    strip_tags($node->teaser),
    array('pubDate' => $pubDate)
    );
  }

/**
 * Ancillary POST function for book_feed
 *
 * @param $node
 *   The node object being traversed
 */
function _book_feed_post($node)
  {
  return NULL ; //"post $node->nid ";
  }

/**
/**
 * Return a feed to nodes below the passed-in node in the book hierarchy,
 * 
 * @param $nid
 *   Node below which the feed is built
 */
function book_feed($nid) {

  global $base_url;

  $namespaces = array('xmlns:dc="http://purl.org/dc/elements/1.1/"');
  $node = node_load($nid);
  $tree = book_menu_subtree_data($node->book);
  $items = book_export_traverse($tree, '_book_feed_pre', '_book_feed_post');
 
  $output = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
    . "<rss version=\"2.0\" xml:base=\"$base_url\" ". implode(' ', $namespaces) .">\n"
    . format_rss_channel($node->title, url("node/$nid"), $node->teaser, $items)
    . "</rss>\n";
  drupal_set_header('Content-Type: application/rssxml; charset=utf-8');
  print $output;
}