add --intro and --outro

feed

@@ -122,6 +122,12 @@ class Audio(object):
         self.date = date
         self.end_date = datetime.datetime(9999, 12, 31, tzinfo=datetime.timezone.utc)
 
+    @classmethod
+    def from_trusted(cls, url_or_path) -> 'Audio':
+        if url_or_path.startswith('/'):
+            return cls('file://' + url_or_path)
+        return cls(url_or_path)
+
     def __str__(self):
         return self.url
 
@@ -465,6 +471,12 @@ def get_parser():
         help="Between each item, put a random file from DIR",
     )
 
+    intro = p.add_argument_group(
+        "intro", "Add intro/outro to output, but only if at least one audio will be output"
+    )
+    intro.add_argument("--intro", default=None, type=str, metavar="PATH")
+    intro.add_argument("--outro", default=None, type=str, metavar="PATH")
+
     p.add_argument(
         "--start",
         default=0,
@@ -640,6 +652,15 @@ def get_audio_by_source(args, parser):
     sources = [weighted_choice(sources, weights)]
     return audio_by_source, sources
 
+def add_intro_outro(audios: list, args) -> list:
+    if not audios:
+        return audios
+    audios = audios.copy()
+    if args.intro:
+        audios.insert(0, Audio.from_trusted(args.intro))
+    if args.outro:
+        audios.append(Audio.from_trusted(args.outro))
+    return audios
 
 def main():
     parser = get_parser()
@@ -701,6 +722,7 @@ def main():
     # this is to support  the --slotsize option
     if not audios:
         return
+    audios = add_intro_outro(audios, args)
     for audio in audios[:-1]:
         if args.debug:
             debug(repr(audio))