Support returning IMAP delimiter.

src/Storage/Imap.php

@@ -29,6 +29,12 @@ class Imap extends AbstractStorage implements Folder\FolderInterface, Writable\W
      */
     protected $currentFolder = '';
 
+    /**
+     * IMAP folder delimiter character
+     * @var string
+     */
+    protected $delimiter;
+
     /**
      * IMAP flags to constants translation
      * @var array
@@ -331,6 +337,7 @@ public function getFolders($rootFolder = null)
                     $parentFolder->$localName = $folder;
                     array_push($folderStack, $parentFolder);
                     $parentFolder = $folder;
+                    $this->delimiter = $data['delim'];
                     break;
                 } elseif ($stack) {
                     $parent = array_pop($stack);
@@ -504,4 +511,17 @@ public function setFlags($id, $flags)
             throw new Exception\RuntimeException('cannot set flags, have you tried to set the recent flag or special chars?');
         }
     }
+
+    /**
+     * get IMAP delimiter
+     *
+     * @return string|null
+     */
+    public function delimiter()
+    {
+        if (!isset($this->delimiter)) {
+            $this->getFolders();
+        }
+        return $this->delimiter;
+    }
 }

test/Storage/ImapTest.php

@@ -697,4 +697,11 @@ public function testCountFlags()
         $this->assertEquals($mail->countMessages([Storage::FLAG_SEEN, Storage::FLAG_FLAGGED]), 0);
         $this->assertEquals($mail->countMessages(Storage::FLAG_FLAGGED), 0);
     }
+
+    public function testDelimiter()
+    {
+        $mail = new Storage\Imap($this->params);
+        $delimiter = $mail->delimiter();
+        $this->assertEquals(strlen($delimiter), 1);
+    }
 }