libsaria: Generic list_source() function

This function will loop over the entire source and collect attributes
for each id.  The resulting list will be returned to the caller.  I also
added a list_queue() function so the user doesn't need to pass the QUEUE
flag.

libsaria/sources/__init__.py

@@ -14,6 +14,8 @@ controls = libsaria.controls
 cur_source = None
 cur_id = None
 
+LIBRARY, PLAYLIST, QUEUE = range(3)
+
 class Source:
 	def __init__(self):
 		self.get_attrs  = None
@@ -70,3 +72,18 @@ def next():
 	if cur_id == None:
 		cur_id = playlist.next()
 	return library.get_attrs(cur_id, "filepath")
+
+def list_source(source, *attrs):
+	ret = []
+	list_func = None
+	get_attrs = library.get_attrs
+	append    = ret.append
+	if source == QUEUE:
+		list_func = queue.list
+	if list_func != None:
+		for id in list_func():
+			append(get_attrs(id, *attrs))
+	return ret
+
+def list_queue(*attrs):
+	return list_source(QUEUE, *attrs)

libsaria/sources/queue/__init__.py

@@ -18,6 +18,10 @@ def walk_queue(*attrs):
 		res.append(library.get_attrs(id, *attrs))
 	return res
 
+def list():
+	for id in queue.queue_list:
+		yield id
+
 def filter(text):
 	global visible, filtered
 	if len(text) > 0: