show nested children (grandchildren) in book_topic_view if option 'show_nested_children' is set

browser/common.py

@@ -609,7 +609,6 @@ class BaseView(GenericView, I18NView):
         for opt in (self.options, self.typeOptions, self.globalOptions):
             if isinstance(opt, DummyOptions):
                 continue
-            #import pdb; pdb.set_trace()
             v = opt
             for key in keys.split('.'):
                 if isinstance(v, list):

browser/skin/lobo/lobo.css

@@ -302,6 +302,10 @@ fieldset.box td {
     margin-top: -1px;
 }
 
+.nested {
+    margin-left: 2em;
+}
+
 .content-1 h1, h1 {
     padding-top: 0.5em;
     font-size: 180%;

compound/book/view_macros.pt

@@ -10,10 +10,26 @@
          tal:content="related/title" />
     </h3>
     <div tal:content="structure related/renderedDescription" />
-    <!-- TODO: show next level (+/-) -->
+    <tal:nested condition="python:related.getOptions('show_nested_children')">
+        <metal:children use-macro="item/book_macros/nested_children" />
+    </tal:nested>
   </div>
 </metal:children>
 
+
+<metal:nested define-macro="nested_children">
+  <div tal:repeat="related related/children"
+       tal:define="level python:level + 1"
+       tal:attributes="class string:nested content-$level">
+    <h3>
+      <a tal:attributes="href python:view.getUrlForTarget(related)"
+         tal:content="related/title" />
+    </h3>
+    <div tal:content="structure related/renderedDescription" />
+  </div>
+</metal:nested>
+
+
 <metal:book define-macro="book">
   <metal:info use-macro="view/concept_macros/concepttitle" />
   <metal:info use-macro="item/book_macros/children" />