refactor + --random-seed

feed

@@ -377,6 +377,8 @@ def get_parser():
         "--sort-by", default="no", type=str, choices=("random", "date", "duration")
     )
     filters.add_argument(
+            '--random-seed', default=None, help='Initialize the random generator. For debug only')
+    filters.add_argument(
         "--reverse", default=False, action="store_true", help="Reverse list order"
     )
 
@@ -526,20 +528,14 @@ def audio_passes_filters(audio, args):
     return True
 
 
-def main():
-    parser = get_parser()
-    args = parser.parse_args()
-    if not args.debug:
-        logging.basicConfig(level=logging.WARNING)
-    else:
-        logging.basicConfig(level=logging.DEBUG)
+def get_audio_by_source(args, parser):
     sources = args.urls
-
     if args.source_weights:
         weights = list(map(int, args.source_weights.split(":")))
         if len(weights) != len(sources):
             parser.exit(
-                status=2, message="Weight must be in the" " same number as sources\n"
+                status=2,
+                message="Weight must be in the same number as sources\n",
             )
     else:
         weights = [1] * len(sources)
@@ -556,6 +552,20 @@ def main():
     if sum(weights) == 0:
         return
     sources = [weighted_choice(sources, weights)]
+    return audio_by_source, sources
+
+
+def main():
+    parser = get_parser()
+    args = parser.parse_args()
+    if not args.debug:
+        logging.basicConfig(level=logging.WARNING)
+    else:
+        logging.basicConfig(level=logging.DEBUG)
+    if args.random_seed is not None:
+        random.seed(args.random_seed)
+
+    audio_by_source, sources = get_audio_by_source(args, parser)
 
     audios = []
     for source_url in sources: