Add simple row status breakdown when viewing batch

tailbone/templates/batch/view.mako

@@ -40,6 +40,18 @@
         display: inline;
     }
     
+    .batch-helper {
+        border: 1px solid black;
+        float: right;
+        margin-top: 1em;
+        padding: 1em;
+        width: 20em;
+    }
+
+    .batch-helper-content {
+        margin-top: 1em;
+    }
+
   </style>
 </%def>
 
@@ -79,6 +91,28 @@
   ${self.context_menu_items()}
 </ul>
 
+% if status_breakdown is not Undefined:
+    <div class="batch-helper">
+      <h3>Row Status Breakdown</h3>
+      <div class="batch-helper-content">
+        % if status_breakdown:
+            <div class="grid full">
+              <table>
+                % for i, (status, count) in enumerate(status_breakdown):
+                    <tr class="${'even' if i % 2 == 0 else 'odd'}">
+                      <td>${status}</td>
+                      <td>${count}</td>
+                    </tr>
+                % endfor
+              </table>
+            </div>
+        % else:
+            <p>Nothing to report yet.</p>
+        % endif
+      </div>
+    </div>
+% endif
+
 <div class="form-wrapper">
   ${form.render(form_id='batch-form', buttons=capture(buttons))|n}
 </div><!-- form-wrapper -->

tailbone/views/batch/core.py

@@ -159,8 +159,29 @@ class BatchMasterView(MasterView):
             kwargs['execute_form'] = self.make_execute_form(batch, action_url=url)
         else:
             kwargs['why_not_execute'] = self.handler.why_not_execute(batch)
+        kwargs['status_breakdown'] = self.make_status_breakdown(batch)
         return kwargs
 
+    def make_status_breakdown(self, batch):
+        """
+        Returns a simple list of 2-tuples, each of which has the status display
+        title as first member, and number of rows with that status as second
+        member.
+        """
+        breakdown = {}
+        for row in batch.active_rows():
+            if row.status_code not in breakdown:
+                breakdown[row.status_code] = {
+                    'code': row.status_code,
+                    'title': row.STATUS[row.status_code],
+                    'count': 0,
+                }
+            breakdown[row.status_code]['count'] += 1
+        breakdown = [
+            (status['title'], status['count'])
+            for code, status in six.iteritems(breakdown)]
+        return breakdown
+
     def allow_worksheet(self, batch):
         return not batch.executed and not batch.complete