[kemonoparty] skip duplicated patreon files (closes #1689)

this behavior can be disabled with the 'patreon-skip-file' option

docs/configuration.rst

@@ -1264,6 +1264,16 @@ Description
     Extract ``username`` metadata
 
 
+extractor.kemonoparty.patreon-skip-file
+---------------------------------------
+Type
+    ``bool``
+Default
+    ``true``
+Description
+    Skip main files in Patreon posts to avoid duplicates.
+
+
 extractor.khinsider.format
 --------------------------
 Type

gallery_dl/extractor/kemonoparty.py

@@ -33,6 +33,8 @@ def items(self):
             KemonopartyExtractor._warning = False
 
         find_inline = re.compile(r'src="(/inline/[^"]+)').findall
+        skip_service = \
+            "patreon" if self.config("patreon-skip-file", True) else None
 
         if self.config("metadata"):
             username = text.unescape(text.extract(
@@ -54,7 +56,8 @@ def items(self):
 
             if file:
                 file["type"] = "file"
-                append(file)
+                if post["service"] != skip_service or not post["attachments"]:
+                    append(file)
             for attachment in post["attachments"]:
                 attachment["type"] = "attachment"
                 append(attachment)
@@ -158,6 +161,11 @@ class KemonopartyPostExtractor(KemonopartyExtractor):
             "options": (("metadata", True),),
             "keyword": {"username": "Kudalyn's Creations"},
         }),
+        # skip patreon main file (#1667, #1689)
+        ("https://kemono.party/patreon/user/4158582/post/32099982", {
+            "count": 2,
+            "keyword": {"type": "attachment"},
+        }),
         ("https://kemono.party/subscribestar/user/alcorart/post/184330"),
     )