Initial code using Drupal 6.38

modules/book/book-node-export-html.tpl.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * @file book-node-export-html.tpl.php
+ * Default theme implementation for rendering a single node in a printer
+ * friendly outline.
+ *
+ * @see book-node-export-html.tpl.php
+ * Where it is collected and printed out.
+ *
+ * Available variables:
+ * - $depth: Depth of the current node inside the outline.
+ * - $title: Node title.
+ * - $content: Node content.
+ * - $children: All the child nodes recursively rendered through this file.
+ *
+ * @see template_preprocess_book_node_export_html()
+ */
+?>
+<div id="node-<?php print $node->nid; ?>" class="section-<?php print $depth; ?>">
+  <h1 class="book-heading"><?php print $title; ?></h1>
+  <?php print $content; ?>
+  <?php print $children; ?>
+</div>