work in progress: basic procedure for determining breadcrumbs list

README.txt

@@ -659,7 +659,9 @@ Breadcrumbs
   >>> loopsRoot.options = ['showBreadcrumbs']
   >>> m114.nodeType = 'page'
   >>> m114.target = cc1
-  >>> view = NodeView(m114, TestRequest())
+  >>> request = TestRequest()
+  >>> view = NodeView(m114, request)
+  >>> request.annotations.setdefault('loops.view', {})['nodeView'] = view
   >>> view.breadcrumbs()
   [{'url': 'http://127.0.0.1/loops/views/m1', 'label': u'Menu'},
    {'url': 'http://127.0.0.1/loops/views/m1/m11', 'label': u'Zope'},

browser/common.py

@@ -416,8 +416,8 @@ class BaseView(GenericView, I18NView):
             if contentType == u'text/html':
                 return text
             return u'<pre>%s</pre>' % util.html_quote(text)
-        source = component.createObject(typeKey, text)
+        source = removeAllProxies(component.createObject(typeKey, text))
-        view = component.getMultiAdapter((removeAllProxies(source), self.request))
+        view = component.getMultiAdapter((source, self.request))
         return view.render()
 
     def renderDescription(self, text=None):

browser/concept.py

@@ -234,6 +234,19 @@ class ConceptView(BaseView):
     def description(self):
         return self.adapted.description
 
+    def breadcrumbs(self):
+        data = []
+        if self.breadcrumbsParent is not None:
+            data.extend(self.breadcrumbsParent.breadcrumbs())
+        if self.context != self.nodeView.targetObject:
+            data.append(dict(label=self.title,
+                             url=self.nodeView.getUrlForTarget(self.context)))
+        return data
+
+    @Lazy
+    def breadcrumbsParent(self):
+        return None
+
     def getData(self, omit=('title', 'description')):
         data = self.instance.applyTemplate()
         for k in omit: