Add stats to boolean fields

wcs/fields.py

@@ -449,6 +449,42 @@ class BoolField(WidgetField):
         else:
             return ''
 
+    def stats(self, values):
+        no_records = len(values)
+        r = TemplateIO(html = True)
+        r += htmltext('<table class="stats">')
+        r += htmltext('<thead><tr><th colspan="3">')
+        r += self.label
+        r += htmltext('</th></tr></thead>')
+        options = (True, False)
+        r += htmltext('<tbody>')
+        for o in options:
+            r += htmltext('<tr>')
+            r += htmltext('<td class="label">')
+            if o is True:
+                r += _('Yes')
+            else:
+                r += _('No')
+            r += htmltext('</td>')
+            no = len([None for x in values if x.data.get(self.id) == str(o)])
+            if no_records:
+                r += htmltext('<td class="percent">')
+                r += ' %.2f %%' % (100.*no/no_records)
+                r += htmltext('</td>')
+                image_len = 300.*no/no_records
+                r += htmltext('<td>')
+                if image_len:
+                    r += htmltext('<img class="bar" src="%simages/bar.png" height="20px" alt="" '
+                            'width="%dpx" />' % (get_publisher().get_root_url(), image_len))
+                r += htmltext('</td>')
+            else:
+                r += htmltext('<td colspan="2"></td>')
+                #'NaN'
+            r += htmltext('</tr>')
+        r += htmltext('</tbody>')
+        r += htmltext('</table>')
+        return r.getvalue()
+
 register_field_class(BoolField)