[support] book navigation

[John Callahan]

I am using the core book module and have exactly one book.  I would like 
to show a block containing the book navigation (or table of contents) 
open to the current page/node I'm on.   The problem is that the default 
Book navigation block behaves like I'd want but  shows the book name as 
the first entry and first level chapters under that (and collapsed if 
using DHTML Menu).  I would much rather have the first level chapters as 
the primary entries and I'll use the book title as the block title.

I've used this piece of code as a block; it does the exact same thing as 
the default book navigation block.

<?php
$book_top_page=168;
$tree = menu_tree_all_data(book_menu_name($book_top_page));
print menu_tree_output($tree);
?>


The following code below shows exactly what I need but does NOT open to 
the current page. (code snippet found on d.o)

Are there any modules or code snippets that can do this?  Any 
suggestions how I can modify the code below to open the item/page based 
on the current node?  (such as adding active-trail class where 
necessary)   Thanks.

- John




<?php
$book_top_page = 168;
$levels_deep = 3;
$emulate_book_block = true;

if (!function_exists('book_struct_recurse')){
function book_struct_recurse($nid, $levels_deep, $children, 
$current_lineage = array(), $emulate_book_block = true) {
$struct = '';
if ($children[$nid] && ($levels_deep > 0 || ($emulate_book_block && 
in_array($nid, $current_lineage)))) {
$struct = '<ul>';
      foreach ($children[$nid] as $key => $node) {
      if ($tree = book_struct_recurse($node->nid, $levels_deep - 1, 
$children, $current_lineage, $emulate_book_block)) {
      $struct .= '<li>';
      $struct .= l($node->title, 'node/'. $node->nid);
      $struct .= $tree;
      $struct .= '</li>';
      }
      else {
      if ($children[$node->nid]){
      $struct .= '<li>'. l($node->title, 'node/'. $node->nid) .'</li>';
      }
      else {
      $struct .= '<li>'. l($node->title, 'node/'. $node->nid) .'</li>';
      }
      }
      }
      $struct .= '</ul>';
return $struct;
}
}
}

$current_lineage = array();

$result = db_query(db_rewrite_sql('SELECT n.nid, n.title, n2.nid parent, 
ml.weight
FROM {node} n
INNER JOIN {book} b ON n.nid = b.nid
INNER JOIN {menu_links} ml ON b.mlid = ml.mlid
INNER JOIN {book} b2 on b2.mlid = ml.plid
INNER JOIN {node} n2 on b2.nid = n2.nid
WHERE n.status =1
ORDER BY ml.weight, n.title'));

while ($node = db_fetch_object($result)) {
if (!$children[$node->parent]) {
$children[$node->parent] = array();
}
array_push($children[$node->parent], $node);

/*  This function is broken, and for my purposes, not needed **********
if (arg(0) == 'node' && is_numeric(arg(1)) && arg(1) == $node->nid) {
  $_temp = book_location($node);
  foreach ($_temp as $key => $val){
    $current_lineage[] = $val->nid;
  }
  $current_lineage[] = arg(1);
}
*/
}

echo book_struct_recurse($book_top_page, $levels_deep, $children, 
$current_lineage, $emulate_book_block);

?>