Show "moderate comments" link in the admin panel only if a moderation workflow is enabled for comments.

svn path=/plone.app.discussion/trunk/; revision=46206

plone/app/discussion/browser/configure.zcml

@@ -54,6 +54,23 @@
         permission="plone.app.discussion.ReviewComments"
         />
 
+    <!-- Moderate comments enabled view -->
+    <browser:page
+        for="Products.CMFPlone.interfaces.IPloneSiteRoot"
+        name="moderate-comments-enabled"
+        layer="..interfaces.IDiscussionLayer"
+        class=".moderation.ModerateCommentsEnabled"
+        permission="zope2.View"
+        />
+
+    <browser:page
+        for="plone.app.layout.navigation.interfaces.INavigationRoot"
+        name="moderate-comments-enabled"
+        layer="..interfaces.IDiscussionLayer"
+        class=".moderation.ModerateCommentsEnabled"
+        permission="zope2.View"
+        />
+		
     <!-- Delete comment view -->
     <browser:page
         for="plone.app.discussion.interfaces.IComment"

plone/app/discussion/browser/moderation.py

@@ -75,6 +75,23 @@ class View(BrowserView):
             return False
 
 
+class ModerateCommentsEnabled(BrowserView):
+
+    def __call__(self):
+        """Returns true if a 'review workflow' is enabled on 'Discussion Item' 
+           content type. A 'review workflow' is characterized by implementing
+           a 'pending' workflow state.
+        """
+        context = aq_inner(self.context)
+        wf_tool = getToolByName(context, 'portal_workflow', None)
+        comment_workflow = wf_tool.getChainForPortalType('Discussion Item')[0]
+        comment_workflow = wf_tool[comment_workflow]
+        if 'pending' in comment_workflow.states:
+            return True
+        else:
+            return
+
+        
 class DeleteComment(BrowserView):
     """Delete a comment from a conversation.