[chan] update to new format

gallery_dl/extractor/4chan.py

@@ -10,23 +10,14 @@
 
 from .chan import ChanExtractor
 
-info = {
-    "category": "4chan",
-    "extractor": "FourChanExtractor",
-    "directory": ["{category}", "{board}-{thread}"],
-    "filename": "{tim}-{filename}{ext}",
-    "pattern": [
-        r"(?:https?://)?boards\.4chan\.org/([^/]+)/thread/(\d+).*",
-    ],
-}
-
 class FourChanExtractor(ChanExtractor):
 
+    category = "4chan"
+    pattern = [r"(?:https?://)?boards\.4chan\.org/([^/]+)/thread/(\d+)"]
     api_url = "https://a.4cdn.org/{board}/thread/{thread}.json"
     file_url = "https://i.4cdn.org/{board}/{tim}{ext}"
 
     def __init__(self, match):
         ChanExtractor.__init__(
-            self, info["category"],
-            match.group(1), match.group(2)
+            self, match.group(1), match.group(2)
         )

gallery_dl/extractor/8chan.py

@@ -10,23 +10,14 @@
 
 from .chan import ChanExtractor
 
-info = {
-    "category": "8chan",
-    "extractor": "InfinityChanExtractor",
-    "directory": ["{category}", "{board}-{thread}"],
-    "filename": "{tim}-{filename}{ext}",
-    "pattern": [
-        r"(?:https?://)?(?:www\.)?8ch\.net/([^/]+)/res/(\d+).*",
-    ],
-}
-
 class InfinityChanExtractor(ChanExtractor):
 
+    category = "8chan"
+    pattern = [r"(?:https?://)?(?:www\.)?8ch\.net/([^/]+)/res/(\d+)"]
     api_url = "https://8ch.net/{board}/res/{thread}.json"
     file_url = "https://8ch.net/{board}/src/{tim}{ext}"
 
     def __init__(self, match):
         ChanExtractor.__init__(
-            self, info["category"],
-            match.group(1), match.group(2)
+            self, match.group(1), match.group(2)
         )

gallery_dl/extractor/chan.py

@@ -13,13 +13,15 @@ from .. import text
 
 class ChanExtractor(Extractor):
 
+    directory_fmt = ["{category}", "{board}-{thread}"]
+    filename_fmt = "{tim}-{filename}{ext}"
     api_url = ""
     file_url = ""
 
-    def __init__(self, category, board, thread):
+    def __init__(self, board, thread):
         Extractor.__init__(self)
         self.metadata = {
-            "category": category,
+            "category": self.category,
             "board": board,
             "thread": thread,
         }