Add basic support for per-page help URL

tailbone/templates/base.mako

@@ -54,6 +54,9 @@
           % endif
 
           <div class="feedback">
+            % if help_url is not Undefined and help_url:
+                ${h.link_to("Help", help_url, target='_blank', class_='button')}
+            % endif
             <button type="button" id="feedback">Feedback</button>
           </div>
 

tailbone/views/master.py

@@ -1192,6 +1192,9 @@ class MasterView(View):
             route_prefix = 'mobile.{}'.format(route_prefix)
         return self.request.route_url('{}.{}'.format(route_prefix, action), **kw)
 
+    def get_help_url(self):
+        return getattr(self, 'help_url', None)
+
     def render_to_response(self, template, data, mobile=False):
         """
         Return a response with the given template rendered with the given data.
@@ -1210,6 +1213,7 @@ class MasterView(View):
             'index_url': self.get_index_url(mobile=mobile),
             'action_url': self.get_action_url,
             'grid_index': self.grid_index,
+            'help_url': self.get_help_url(),
         }
 
         if self.grid_index: