Add Percentage aggregation function to views_aggregator_more_functions

views_aggregator_functions.inc

@@ -187,7 +187,7 @@ function views_aggregator_group_and_compress($view_results, $field_handler, $cas
  * @param array $groups
  *   an array of groups of rows, each group indexed by group value
  * @param object $field_handler
- *   the handler for the view column to find the minimum in
+ *   the handler for the view column to find the average in
  * @param int $precision_group
  *   the number of decimals, if specified
  * @param int $precision_column
@@ -389,7 +389,7 @@ function views_aggregator_expression($groups, $field_handler, $group_exp = NULL,
       $value = $math->evaluate($expression);
     }
   }
-  // Should we call number_format($value, $precision, $decimal, $separator)
+  // Should we call: number_format($value, $precision, $decimal, $separator) ?
   $values['column'] = $value;
   return $values;
 }

views_aggregator_more_functions/views_aggregator_more_functions.module

@@ -16,6 +16,11 @@ function views_aggregator_more_functions_views_aggregation_functions_info() {
       'column' => NULL,
       'is_renderable' => TRUE,
     ),
+    'views_aggregator_percentage' => array(
+      'group' => t('Percentage'),
+      'column' => t('100%'),
+      'is_renderable' => TRUE
+    ),
   );
   return $functions;
 }
@@ -35,4 +40,37 @@ function views_aggregator_group_seq_number($groups, $field_handler = NULL, $star
     $values[$group] = $count++;
   }
   return $values;
+}
+
+/**
+ * Aggregates a field group total as the percentage of the column total.
+ *
+ * @param array $groups
+ *   an array of groups of rows, each group indexed by group value
+ * @param object $field_handler
+ *   the handler for the view column to calculate percentages in
+ *
+ * @return array
+ *   an array of values, one for each group and one for the column (always 100%)
+ */
+function views_aggregator_percentage($groups, $field_handler, $arg_group, $arg_column) {
+  $values = array();
+  $sum_column = 0.0;
+  foreach ($groups as $group => $rows) {
+    $sum = 0.0;
+    foreach ($rows as $num => $row) {
+      // Do not count empty or non-numeric cells.
+      $cell = vap_num(views_aggregator_get_cell($field_handler, $num, FALSE));
+      if ($cell !== FALSE) {
+        $sum += $cell;
+      }
+    }
+    $values[$group] = $sum;
+    $sum_column += $sum;
+  }
+  foreach ($groups as $group => $rows) {
+    $values[$group] = 100 * $values[$group] / $sum_column;
+  }
+  $values['column'] = 100;
+  return $values;
 }
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