options are organized in groups

feed

@@ -151,15 +151,19 @@ def get_duration(url):
 
 def get_parser():
     p = ArgumentParser('Get music from a (well-specified) xml feed')
+    src = p.add_argument_group('sources', 'How to deal with sources')
+    p.add_argument('--source-weights',
+                   help='Select only one "source" based on this weights')
+
+    filters = p.add_argument_group('filters', 'Select only items that match these conditions')
+    filters.add_argument('--max-len', default=0, type=int,
+            help='Exclude any audio that is longer than MAXLEN seconds')
+    filters.add_argument('--random', default=False,
+            action='store_true', help='Pick randomly')
+
     p.add_argument('--start', default=0, type=int,
                    help='0-indexed start number. '
                    'By default, play from most recent')
-    p.add_argument('--max-len', default=0, type=int,
-                   help='Exclude any audio that is longer than MAXLEN seconds')
-    p.add_argument('--random', default=False,
-                   action='store_true', help='Pick randomly')
-    p.add_argument('--source-weights',
-                   help='Select only one "source" based on this weights')
     p.add_argument('--howmany', default=1, type=int,
                    help='If not specified, only 1 will be played')
     p.add_argument('--slotsize', help='Seconds between each audio', type=int)