Render batch execution description as markdown

tailbone/views/batch/core.py

@@ -38,6 +38,7 @@ from six import StringIO
 
 import json
 import six
+import markdown
 import sqlalchemy as sa
 from sqlalchemy import orm
 
@@ -175,6 +176,10 @@ class BatchMasterView(MasterView):
         if kwargs['execute_enabled']:
             url = self.get_action_url('execute', batch)
             kwargs['execute_form'] = self.make_execute_form(batch, action_url=url)
+            description = (self.handler.describe_execution(batch)
+                           or "TODO: handler does not provide a description for this batch")
+            kwargs['execution_described'] = markdown.markdown(
+                description, extensions=['fenced_code', 'codehilite'])
         else:
             kwargs['why_not_execute'] = self.handler.why_not_execute(batch)