libsaria: Remove unused global statements and imports

With my recent cleanups, I don't need these statements anymore.  To do
this, I also had to move tracking recent songs to next.py

libsaria/sources/playlist/__init__.py

@@ -4,14 +4,9 @@ import libsaria
 from libsaria.sources import library
 import playlist
 import next
-import random
 
 filtered   = False
 visible    = None
-recent     = []
-recent_msg = "Skipping %s by %s because it has played recently"
-skip_msg   = "Skipping %s by %s because I don't think you like it"
-cur_index  = None
 
 # Function pointers for convenience
 add_ids = playlist.add_ids
@@ -25,9 +20,6 @@ def list_ids():
 		yield id
 
 def filter(text):
-	global visible
-	global song_set
-	global filtered
 	if len(text) > 0:
 		visible  = playlist.as_set().intersection(library.test_filter(text))
 		filtered = True
@@ -36,8 +28,6 @@ def filter(text):
 		filtered = False
 
 def is_visible(id):
-	global visible
-	global filtered
 	if filtered == True:
 		return id in visible
 	return True
@@ -60,7 +50,5 @@ def get_next(cur_id):
 		id = playlist.get(index)
 	if id != None:
 		artist, title, file = library.get_attrs(id, "artist", "title", "filepath")
-		next.recent.append((artist, title))
-		if len(recent) > 50:
-			recent.pop(0)
+		next.track_recent(artist, title)
 		return id

libsaria/sources/playlist/next.py

@@ -6,6 +6,11 @@ from libsaria.sources import library
 
 recent = []
 
+def track_recent(artist, title):
+	recent.append((artist, title))
+	if len(recent) > 50:
+		recent.pop(0)
+
 def incr_index(cur_index, max_index):
 	cur_index += 1
 	if cur_index == max_index: