Allow to group exports

Export/ExportManager.php

@@ -231,6 +231,26 @@ class ExportManager
         }
     }
     
+    /**
+     * Get all exports grouped in an array.
+     * 
+     * @param bool $whereUserIsGranted
+     * @return array where keys are the groups's name and value is an array of exports
+     */
+    public function getExportsGrouped($whereUserIsGranted = true): array
+    {
+        $groups = [ '_' => [] ];
+        foreach ($this->getExports($whereUserIsGranted) as $alias => $export) {
+            if ($export instanceof GroupedExportInterface) {
+                $groups[$export->getGroup()][$alias] = $export;
+            } else {
+                $groups['_'][$alias] = $export;
+            }
+        }
+        
+        return $groups;
+    }
+    
     /**
      * Return an export by his alias
      * 

Export/GroupedExportInterface.php

@@ -0,0 +1,16 @@
+<?php
+/*
+ * 
+ */
+namespace Chill\MainBundle\Export;
+
+/**
+ * Add a grouping option to exports. 
+ * 
+ * **usage**: the exports will be grouped under the key given by the `getGroup` 
+ * method. 
+ */
+interface GroupedExportInterface
+{
+    public function getGroup(): string;
+}