player/configfiles: write playlist titles in watch later files

If ytdl_hook extracted a playlist title, write it in the watch later
redirect entry. This will be shown in the watch later menu.

Author: Guido Cella

player/configfiles.c

@@ -266,16 +266,13 @@ static void write_filename(struct MPContext *mpctx, FILE *file, char *filename)
     }
 }
 
-static void write_title(struct MPContext *mpctx, FILE *file)
+static void write_title(struct MPContext *mpctx, FILE *file, const char *title)
 {
-    if (mpctx->opts->write_filename_in_watch_later_config) {
-        const char *title = mp_find_non_filename_media_title(mpctx);
-        if (title) {
-            char write_title[1024] = {0};
-            for (int n = 0; title[n] && n < sizeof(write_title) - 1; n++)
-                write_title[n] = (unsigned char)title[n] < 32 ? '_' : title[n];
-            fprintf(file, "# title: %s\n", write_title);
-        }
+    if (mpctx->opts->write_filename_in_watch_later_config && title) {
+        char write_title[1024] = {0};
+        for (int n = 0; title[n] && n < sizeof(write_title) - 1; n++)
+            write_title[n] = (unsigned char)title[n] < 32 ? '_' : title[n];
+        fprintf(file, "# title: %s\n", write_title);
     }
 }
 
@@ -287,6 +284,8 @@ static void write_redirect(struct MPContext *mpctx, char *path)
         if (file) {
             fprintf(file, "# redirect entry\n");
             write_filename(mpctx, file, path);
+            write_title(mpctx, file,
+                        mp_tags_get_str(mpctx->demuxer->metadata, "ytdl_playlist_title"));
             fclose(file);
         }
 
@@ -352,7 +351,7 @@ void mp_write_watch_later_conf(struct MPContext *mpctx)
 
     write_filename(mpctx, file, path);
 
-    write_title(mpctx, file);
+    write_title(mpctx, file, mp_find_non_filename_media_title(mpctx));
 
     bool write_start = true;
     double pos = get_playback_time(mpctx);