[pixiv] add 'full-series' option for novels (#4111)

docs/configuration.rst

@@ -2436,6 +2436,17 @@ Description
     Download images embedded in novels.
 
 
+extractor.pixiv.novel.full-series
+---------------------------------
+Type
+    ``bool``
+Default
+    ``false``
+Description
+    When downloading a novel being part of a series,
+    download all novels of that series.
+
+
 extractor.pixiv.metadata
 ------------------------
 Type

gallery_dl/extractor/pixiv.py

@@ -796,6 +796,11 @@ class PixivNovelExtractor(PixivExtractor):
             "options": (("embeds", True),),
             "count": 3,
         }),
+        # full series
+        ("https://www.pixiv.net/novel/show.php?id=19612040", {
+            "options": (("full-series", True),),
+            "count": 4,
+        }),
         # short URL
         ("https://www.pixiv.net/n/19612040"),
     )
@@ -893,7 +898,11 @@ class PixivNovelExtractor(PixivExtractor):
                         yield Message.Queue, url, novel
 
     def novels(self):
-        return (self.api.novel_detail(self.novel_id),)
+        novel = self.api.novel_detail(self.novel_id)
+        if self.config("full-series") and novel["series"]:
+            self.subcategory = PixivNovelSeriesExtractor.subcategory
+            return self.api.novel_series(novel["series"]["id"])
+        return (novel,)
 
 
 class PixivNovelUserExtractor(PixivNovelExtractor):