[wallhaven] implement 'metadata' option (#2803)

docs/configuration.rst

@@ -2538,6 +2538,18 @@ Description
     See https://wallhaven.cc/help/api for more information.
 
 
+extractor.wallhaven.metadata
+----------------------------
+Type
+    ``bool``
+Default
+    ``false``
+Description
+    Extract additional metadata (tags, uploader)
+
+    Note: This requires 1 additional HTTP request for each post.
+
+
 extractor.weasyl.api-key
 ------------------------
 Type

docs/gallery-dl.conf

@@ -313,7 +313,8 @@
         },
         "wallhaven":
         {
-            "api-key": null
+            "api-key": null,
+            "metadata": false
         },
         "weasyl":
         {

gallery_dl/extractor/wallhaven.py

@@ -189,7 +189,7 @@ class WallhavenAPI():
 
     def collections(self, username):
         endpoint = "/v1/collections/" + username
-        return self._pagination(endpoint)
+        return self._pagination(endpoint, metadata=False)
 
     def search(self, params):
         endpoint = "/v1/search"
@@ -200,13 +200,20 @@ class WallhavenAPI():
         return self.extractor.request(
             url, headers=self.headers, params=params).json()
 
-    def _pagination(self, endpoint, params=None):
+    def _pagination(self, endpoint, params=None, metadata=None):
         if params is None:
             params = {}
+        if metadata is None:
+            metadata = self.extractor.config("metadata")
 
         while True:
             data = self._call(endpoint, params)
-            yield from data["data"]
+
+            if metadata:
+                for wp in data["data"]:
+                    yield self.info(str(wp["id"]))
+            else:
+                yield from data["data"]
 
             meta = data.get("meta")
             if not meta or meta["current_page"] >= meta["last_page"]: