Associate tags to tasks in BoardFormatter

app/functions.php

@@ -2,11 +2,61 @@
 
 use Kanboard\Core\Translator;
 
+/**
+ * Associate another dict to a dict based on a common key
+ *
+ * @param array  $input
+ * @param array  $relations
+ * @param string $relation
+ * @param string $column
+ */
+function array_merge_relation(array &$input, array &$relations, $relation, $column)
+{
+    foreach ($input as &$row) {
+        if (isset($row[$column]) && isset($relations[$row[$column]])) {
+            $row[$relation] = $relations[$row[$column]];
+        } else {
+            $row[$relation] = array();
+        }
+    }
+}
+
+/**
+ * Create indexed array from a list of dict
+ *
+ * $input = [
+ *   ['k1' => 1, 'k2' => 2], ['k1' => 3, 'k2' => 4], ['k1' => 2, 'k2' => 5]
+ * ]
+ *
+ * array_column_index($input, 'k1') will returns:
+ *
+ * [
+ *   1 => [['k1' => 1, 'k2' => 2], ['k1' => 2, 'k2' => 5]],
+ *   3 => [['k1' => 3, 'k2' => 4]],
+ * ]
+ *
+ * @param  array   $input
+ * @param  string  $column
+ * @return array
+ */
+function array_column_index(array &$input, $column)
+{
+    $result = array();
+
+    foreach ($input as &$row) {
+        if (isset($row[$column])) {
+            $result[$row[$column]][] = $row;
+        }
+    }
+
+    return $result;
+}
+
 /**
  * Sum all values from a single column in the input array
  *
  * $input = [
- *   ['column' => 2'], ['column' => 3']
+ *   ['column' => 2], ['column' => 3]
  * ]
  *
  * array_column_sum($input, 'column') returns 5