libsaria: Move playlist's list to new file

It will be easier to work with from a new file, especially after I put
in functions for doing basic operations on it.

libsaria/sources/playlist/__init__.py

@@ -2,14 +2,12 @@
 
 import libsaria
 import libsaria.path.files
+import playlist
 
 library = None
 source  = None
 rand    = None
 
-song_list = []
-song_set  = set(song_list)
-
 filtered   = False
 visible    = None
 recent     = None
@@ -17,21 +15,11 @@ 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
 
-def add_id(id):
-	global song_list
-	global song_set
-	if id not in song_set:
-		song_list.append(id)
-		song_set.add(id)
-
-def add_ids(ids):
-	for id in ids:
-		add_id(id)
-	save()
+# Function pointers for convenience
+add_ids = playlist.add_ids
 
 def rm_id(id):
-	song_list.remove(id)
-	song_set.remove(id)
+	playlist.song_list.remove(id)
 
 def rm_ids(ids):
 	for id in ids:
@@ -52,20 +40,16 @@ def init():
 	source.save       = save
 
 def reset():
-	global song_list
-	global song_set
 	global recent
 	global cur_index
 	recent    = []
-	song_list = []
-	song_set  = set()
+	playlist.song_list = []
 	cur_index = -1
 
 def default_objects():
 	return ([], [], -1)
 
 def load():
-	global song_list
 	global song_set
 	global recent
 	global visible
@@ -74,12 +58,11 @@ def load():
 	if objects == None or len(objects) != 3:
 		reset()
 	else:
-		song_list = objects[0]
+		playlist.song_list = objects[0]
 		recent    = objects[1]
 		cur_index = objects[2]
-		song_set  = set(song_list)
 		if cur_index >= 0:
-			libsaria.sources.cur_lib_id = song_list[cur_index]
+			libsaria.sources.cur_lib_id = playlist.song_list[cur_index]
 
 def init_bg():
 	init()
@@ -87,14 +70,13 @@ def init_bg():
 
 def startup():
 	if cur_index >= 0:
-		load_id(song_list[cur_index])
+		load_id(playlist.song_list[cur_index])
 
 def save():
-	libsaria.storage.save_obj("playlist", (song_list, recent, cur_index))
+	libsaria.storage.save_obj("playlist", (playlist.song_list, recent, cur_index))
 
 def walk():
-	global song_list
-	for id in song_list:
+	for id in playlist.song_list:
 		yield id
 
 def walk_playlist(*attrs):
@@ -108,10 +90,10 @@ def filter(text):
 	global song_set
 	global filtered
 	if len(text) > 0:
-		visible  = song_set.intersection(library.test_filter(text))
+		visible  = playlist.as_set().intersection(library.test_filter(text))
 		filtered = True
 	else:
-		visible  = song_set
+		visible  = playlist.as_set()
 		filtered = False
 
 def is_visible(id):
@@ -124,23 +106,22 @@ def is_visible(id):
 def num_visible():
 	if filtered == True:
 		return len(visible)
-	return len(song_list)
+	return len(playlist.song_list)
 
 def get_cur_id():
-	return song_list[cur_index]
+	return playlist.song_list[cur_index]
 
 def seq_next():
 	global cur_index
-	global song_list
 	cur_index += 1
-	max_index  = len(song_list)
+	max_index  = len(playlist.song_list)
 	if cur_index == max_index:
 		cur_index = 0
-	while is_visible(song_list[cur_index]) == False:
+	while is_visible(playlist.song_list[cur_index]) == False:
 		cur_index += 1
 		if cur_index == max_index:
 			cur_index = 0
-	return song_list[cur_index]
+	return playlist.song_list[cur_index]
 
 def rand_candidate(list, max):
 	index = rand.randint(0, max-1)
@@ -154,7 +135,7 @@ def rand_next():
 	get_attrs = library.get_attrs
 
 	if filtered == False:
-		selection = song_list
+		selection = playlist.song_list
 	else:
 		selection = list(visible)
 
@@ -169,13 +150,13 @@ def rand_next():
 			continue
 		if i > 0:
 			print "Picking a song took %s iterations" % i
-		cur_index = song_list.index(id)
+		cur_index = playlist.song_list.index(id)
 		return id
 	return id
 
 def load_id(id):
 	global cur_index
-	cur_index = song_list.index(id)
+	cur_index = playlist.song_list.index(id)
 	save()
 	path = library.get_attrs(id, "filepath")
 	return source.load_file(path)
@@ -189,7 +170,7 @@ def play_id(id):
 
 def next():
 	id = None
-	if len(song_list) == 0:
+	if len(playlist.song_list) == 0:
 		return
 	if libsaria.prefs.get("libsaria.random") == True:
 		id = rand_next()

libsaria/sources/playlist/playlist.py

@@ -0,0 +1,22 @@
+# Bryan Schumaker (5 / 11 / 2011)
+
+import threading
+plist_lock   = threading.Lock()
+lock_plist   = plist_lock.acquire
+unlock_plist = plist_lock.release
+
+# Playlist
+song_list = []
+song_set  = set()
+
+
+def add_ids(id_list):
+	lock_plist()
+	song_list.extend(id_list)
+	unlock_plist()
+
+def as_set():
+	lock_plist()
+	song_set = set(song_list)
+	unlock_plist()
+	return song_set