[niconico:tag] Add support for searching tags (#2789)

yt_dlp/extractor/extractors.py

@@ -1011,6 +1011,7 @@
  NicovideoSearchDateIE,
  NicovideoSearchIE,
  NicovideoSearchURLIE,
+ NicovideoTagURLIE,
 )
 from .ninecninemedia import (
  NineCNineMediaIE,

yt_dlp/extractor/niconico.py

@@ -663,6 +663,8 @@ def pagefunc(pagenum):
 
 
 class NicovideoSearchBaseIE(InfoExtractor):
+ _SEARCH_TYPE = 'search'
+
  def _entries(self, url, item_id, query=None, note='Downloading page %(page)s'):
  query = query or {}
  pages = [query['page']] if 'page' in query else itertools.count(1)
@@ -677,7 +679,7 @@ def _entries(self, url, item_id, query=None, note='Downloading page %(page)s'):
 
  def _search_results(self, query):
  return self._entries(
- self._proto_relative_url(f'//www.nicovideo.jp/search/{query}'), query)
+ self._proto_relative_url(f'//www.nicovideo.jp/{self._SEARCH_TYPE}/{query}'), query)
 
 
 class NicovideoSearchIE(NicovideoSearchBaseIE, SearchInfoExtractor):
@@ -757,6 +759,25 @@ def _get_entries_for_date(self, url, item_id, start_date, end_date=None, page_nu
  yield from super()._entries(url, item_id, query=query, note=note)
 
 
+class NicovideoTagURLIE(NicovideoSearchBaseIE):
+ IE_NAME = 'niconico:tag'
+ IE_DESC = 'NicoNico video tag URLs'
+ _SEARCH_TYPE = 'tag'
+ _VALID_URL = r'https?://(?:www\.)?nicovideo\.jp/tag/(?P<id>[^?#&]+)?'
+ _TESTS = [{
+ 'url': 'https://www.nicovideo.jp/tag/ドキュメンタリー淫夢',
+ 'info_dict': {
+ 'id': 'ドキュメンタリー淫夢',
+ 'title': 'ドキュメンタリー淫夢'
+ },
+ 'playlist_mincount': 400,
+ }]
+
+ def _real_extract(self, url):
+ query = self._match_id(url)
+ return self.playlist_result(self._entries(url, query), query, query)
+
+
 class NiconicoUserIE(InfoExtractor):
  _VALID_URL = r'https?://(?:www\.)?nicovideo\.jp/user/(?P<id>\d+)/?(?:$|[#?])'
  _TEST = {