libsaria: Add new songs to the library

I scan a directory and collect fileids for each file.  If the fileid
doesn't exist in the library yet, I'll find the tags and add to the
dictionary.

libsaria/callbacks.py

@@ -37,6 +37,10 @@ on_new_source = null_cb
 def new_source():
 	on_new_source()
 
+on_library_updated = null_cb
+def library_updated():
+	on_library_updated()
+
 on_queue_changed = null_cb
 def queue_changed():
 	on_queue_changed()

libsaria/sources/__init__.py

@@ -59,6 +59,7 @@ def make_library(path):
 		return
 	library.add_path(path)
 	library.update()
+	libsaria.callbacks.library_updated()
 
 def play_id(id):
 	global cur_id

libsaria/sources/library/update.py

@@ -3,11 +3,14 @@
 import os
 
 import library
+import track
 
 stat = os.stat
 walk = os.walk
 join = os.path.join
 
+Track = track.Track
+
 def song_id(path):
 	return stat(path).st_ino
 
@@ -20,9 +23,24 @@ def scan_path(path):
 			file_map[song_id(file)] = file
 	return file_map
 
-def update_path(path, origdict):
+def add_new_ids(old_ids, new_ids, tracks, file_map):
+	to_add = new_ids - old_ids
+	for id in to_add:
+		try:
+			fpath = file_map[id]
+			tracks[id] = Track(fpath)
+		except Exception, e:
+			pass
+
+def update_path(path, tracks):
 	file_map = scan_path(path)
+	old_ids  = set(tracks.keys())
+	new_ids  = set(file_map.keys())
+
+	add_new_ids(old_ids, new_ids, tracks, file_map)
 
 def update():
+	library.lock_library()
 	for path, lib in library.lib_dict.iteritems():
 		update_path(path, lib)
+	library.unlock_library()