[kemono:discord] add 'order-posts' option (#8241)

docs/configuration.rst

@@ -3631,9 +3631,27 @@ Description
     `revisions <extractor.kemono.revisions_>`__
     are returned.
 
-    * ``"asc"``: Ascending order (oldest first)
-    * ``"desc"``: Descending order (newest first)
-    * ``"reverse"``: Same as ``"asc"``
+    ``"asc"`` | ``"reverse"``
+        Ascending order (oldest first)
+    ``"desc"``
+        Descending order (newest first)
+
+
+extractor.kemono.discord.order-posts
+------------------------------------
+Type
+    ``string``
+Default
+    ``"asc"``
+Description
+    Controls the order in which
+    ``discord`` posts
+    are returned.
+
+    ``"asc"``
+        Ascending order (oldest first)
+    ``"desc"`` | ``"reverse"``
+        Descending order (newest first)
 
 
 extractor.khinsider.covers

docs/gallery-dl.conf

@@ -488,7 +488,11 @@
             "max-posts"    : null,
             "metadata"     : true,
             "revisions"    : false,
-            "order-revisions": "desc"
+            "order-revisions": "desc",
+
+            "discord": {
+                "order-posts": "asc"
+            }
         },
         "khinsider":
         {

gallery_dl/extractor/kemono.py

@@ -407,7 +407,11 @@ class KemonoDiscordExtractor(KemonoExtractor):
             r"(/[A-Za-z0-9-._~:/?#\[\]@!$&'()*+,;%=]+)").findall
         find_hash = util.re(HASH_PATTERN).match
 
-        posts = self.api.discord_channel(channel_id)
+        if (order := self.config("order-posts")) and order[0] in ("r", "d"):
+            posts = self.api.discord_channel(channel_id, channel["post_count"])
+        else:
+            posts = self.api.discord_channel(channel_id)
+
         if max_posts := self.config("max-posts"):
             posts = itertools.islice(posts, max_posts)
 
@@ -627,9 +631,12 @@ class KemonoAPI():
         endpoint = f"/{service}/user/{creator_id}/tags"
         return self._call(endpoint)
 
-    def discord_channel(self, channel_id):
+    def discord_channel(self, channel_id, post_count=None):
         endpoint = f"/discord/channel/{channel_id}"
-        return self._pagination(endpoint, {}, 150)
+        if post_count is None:
+            return self._pagination(endpoint, {}, 150)
+        else:
+            return self._pagination_reverse(endpoint, {}, 150, post_count)
 
     def discord_channel_lookup(self, server_id):
         endpoint = f"/discord/channel/lookup/{server_id}"
@@ -670,3 +677,18 @@ class KemonoAPI():
             if len(data) < batch:
                 return
             params["o"] += batch
+
+    def _pagination_reverse(self, endpoint, params, batch, count):
+        params["o"] = count // batch * batch
+
+        while True:
+            data = self._call(endpoint, params)
+
+            if not data:
+                return
+            data.reverse()
+            yield from data
+
+            if not params["o"]:
+                return
+            params["o"] -= batch

test/results/kemono.py

@@ -535,7 +535,33 @@ __tests__ = (
     "#url"     : "https://kemono.cr/discord/server/488668827274444803/608504710906904576",
     "#category": ("", "kemono", "discord"),
     "#class"   : kemono.KemonoDiscordExtractor,
-    "#count"   : 4,
+    "#results" : (
+        "https://kemono.cr/data/6e/6a/6e6a4a048e6f3c047edac851d1f66eca4a4f0a823faa1d9395892378fcb700b1.png",
+        "https://kemono.cr/data/55/e1/55e1ddf540ded5e6651de65c059529d1f51451cde523ec103dc696f1cc3595a4.png",
+        "https://kemono.cr/data/9d/98/9d983fd163d5f5335c896c93b9f363198d6ca14a7e5bf0fa823aa86268732f85.png",
+        "https://kemono.cr/data/fb/54/fb54ff75f1c879b25bf031a55a1730002049337693443f1b57c08b07e35c452f.png",
+    ),
+
+    "channel"      : "finish-work",
+    "channel_id"   : "608504710906904576",
+    "channel_nsfw" : False,
+    "channel_topic": None,
+    "channel_type" : 0,
+    "server"       : "ABFMMD NSFW Server",
+    "server_id"    : "488668827274444803",
+},
+
+{
+    "#url"     : "https://kemono.cr/discord/server/488668827274444803/608504710906904576",
+    "#category": ("", "kemono", "discord"),
+    "#class"   : kemono.KemonoDiscordExtractor,
+    "#options" : {"order-posts": "reverse"},
+    "#results" : (
+        "https://kemono.cr/data/fb/54/fb54ff75f1c879b25bf031a55a1730002049337693443f1b57c08b07e35c452f.png",
+        "https://kemono.cr/data/9d/98/9d983fd163d5f5335c896c93b9f363198d6ca14a7e5bf0fa823aa86268732f85.png",
+        "https://kemono.cr/data/55/e1/55e1ddf540ded5e6651de65c059529d1f51451cde523ec103dc696f1cc3595a4.png",
+        "https://kemono.cr/data/6e/6a/6e6a4a048e6f3c047edac851d1f66eca4a4f0a823faa1d9395892378fcb700b1.png",
+    ),
 
     "channel"      : "finish-work",
     "channel_id"   : "608504710906904576",