[ie] Migrate commonly plural fields to lists (#8917)

[yt-dlp.git] / yt_dlp / YoutubeDL.py

diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index bd20d0896ea49ccc2303be452fa3a6ac50e88549..99b3ea8c218f4a20059ed74c5f8b63f08f4f7a0f 100644 (file)
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -580,6 +580,13 @@ class YoutubeDL:
         'http_headers', 'stretched_ratio', 'no_resume', 'has_drm', 'extra_param_to_segment_url', 'hls_aes', 'downloader_options',
         'page_url', 'app', 'play_path', 'tc_url', 'flash_version', 'rtmp_live', 'rtmp_conn', 'rtmp_protocol', 'rtmp_real_time'
     }
+    _deprecated_multivalue_fields = {
+        'album_artist': 'album_artists',
+        'artist': 'artists',
+        'composer': 'composers',
+        'creator': 'creators',
+        'genre': 'genres',
+    }
     _format_selection_exts = {
         'audio': set(MEDIA_EXTENSIONS.common_audio),
         'video': set(MEDIA_EXTENSIONS.common_video + ('3gp', )),
@@ -2640,6 +2647,14 @@ def _fill_common_fields(self, info_dict, final=True):
             if final and info_dict.get('%s_number' % field) is not None and not info_dict.get(field):
                 info_dict[field] = '%s %d' % (field.capitalize(), info_dict['%s_number' % field])
 
+        for old_key, new_key in self._deprecated_multivalue_fields.items():
+            if new_key in info_dict and old_key in info_dict:
+                self.deprecation_warning(f'Do not return {old_key!r} when {new_key!r} is present')
+            elif old_value := info_dict.get(old_key):
+                info_dict[new_key] = old_value.split(', ')
+            elif new_value := info_dict.get(new_key):
+                info_dict[old_key] = ', '.join(v.replace(',', '\N{FULLWIDTH COMMA}') for v in new_value)
+
     def _raise_pending_errors(self, info):
         err = info.pop('__pending_error', None)
         if err: