add missing extractor info when spawning new ones (fixes #1051)

Not having this information causes the blacklist/whitelist logic to
trigger and prevents things from functioning as intended when using
default settings.

Fixes issues for 8muses, deviantart, exhentai, and mangoxo.

gallery_dl/extractor/8muses.py

@@ -94,12 +94,12 @@ def items(self):
             if albums:
                 for album in albums:
                     url = self.root + "/comics/album/" + album["permalink"]
-                    album = {
-                        "url"    : url,
-                        "name"   : album["name"],
-                        "private": album["isPrivate"],
+                    yield Message.Queue, url, {
+                        "url"       : url,
+                        "name"      : album["name"],
+                        "private"   : album["isPrivate"],
+                        "_extractor": _8musesAlbumExtractor,
                     }
-                    yield Message.Queue, url, album
 
             if data["page"] >= data["pages"]:
                 return

gallery_dl/extractor/deviantart.py

@@ -262,9 +262,11 @@ def _find_folder(folders, name):
                 return folder
         raise exception.NotFoundError("folder")
 
-    def _folder_urls(self, folders, category):
-        url = "{}/{}/{}/0/".format(self.root, self.user, category)
-        return [(url + folder["name"], folder) for folder in folders]
+    def _folder_urls(self, folders, category, extractor):
+        base = "{}/{}/{}/0/".format(self.root, self.user, category)
+        for folder in folders:
+            folder["_extractor"] = extractor
+            yield base + folder["name"], folder
 
     def _update_content_default(self, deviation, content):
         public = "premium_folder_data" not in deviation
@@ -450,7 +452,7 @@ def deviations(self):
         if self.flat and not self.group:
             return self.api.gallery_all(self.user, self.offset)
         folders = self.api.gallery_folders(self.user)
-        return self._folder_urls(folders, "gallery")
+        return self._folder_urls(folders, "gallery", DeviantartFolderExtractor)
 
 
 class DeviantartFolderExtractor(DeviantartExtractor):
@@ -589,7 +591,8 @@ def deviations(self):
                 self.api.collections(self.user, folder["folderid"])
                 for folder in folders
             )
-        return self._folder_urls(folders, "favourites")
+        return self._folder_urls(
+            folders, "favourites", DeviantartCollectionExtractor)
 
 
 class DeviantartCollectionExtractor(DeviantartExtractor):

gallery_dl/extractor/exhentai.py

@@ -392,6 +392,7 @@ def __init__(self, match):
     def items(self):
         self.login()
         yield Message.Version, 1
+        data = {"_extractor": ExhentaiGalleryExtractor}
 
         while True:
             last = None
@@ -402,7 +403,7 @@ def items(self):
                 if url == last:
                     continue
                 last = url
-                yield Message.Queue, url, {}
+                yield Message.Queue, url, data
 
             if 'class="ptdd">&gt;<' in page or ">No hits found</p>" in page:
                 return

gallery_dl/extractor/mangoxo.py

@@ -167,14 +167,16 @@ def items(self):
         self.login()
         num = total = 1
         url = "{}/channel/{}/album/".format(self.root, self.channel_id)
+        data = {"_extractor": MangoxoAlbumExtractor}
+
         yield Message.Version, 1
 
         while True:
             page = self.request(url + str(num)).text
 
             for album in text.extract_iter(
                     page, '<a class="link black" href="', '"'):
-                yield Message.Queue, album, {}
+                yield Message.Queue, album, data
 
             if num == 1:
                 total = self._total_pages(page)