From f0e9e8e0dc2bea9fb09c89c32d45ce71012ca512 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mike=20F=C3=A4hrmann?= <mike_faehrmann@web.de>
Date: Sun, 13 Dec 2015 04:34:15 +0100
Subject: [PATCH] ensure extractors() returns each extractor only once

---
 gallery_dl/extractor/__init__.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gallery_dl/extractor/__init__.py b/gallery_dl/extractor/__init__.py
index 9885c8c1..e0bfeede 100644
--- a/gallery_dl/extractor/__init__.py
+++ b/gallery_dl/extractor/__init__.py
@@ -61,8 +61,10 @@ def find(url):
 
 def extractors():
     """Yield all available extractor classes"""
-    for _, klass in _list_patterns():
-        yield klass
+    return sorted(
+        set(klass for _, klass in _list_patterns()),
+        key=lambda x: x.__name__
+    )
 
 # --------------------------------------------------------------------
 # internals