Library backup

I can now backup the library to an xml file.  This will be useful for
library updates in the future.  The plan is to eventually backport this
feature to Ocarina 4.1 (To make the 4.1 -> 4.2 transition easier)

libsaria/backup.py

@@ -0,0 +1,54 @@
+# Bryan Schumaker (11/12/2010)
+
+from libsaria import path
+from libsaria.collection import library
+import xm as xml
+
+add_child = xml.add_child
+add_text  = xml.add_text
+get_attrs = library.get_attrs
+lib_file  = path.join(path.saria_dir(), "library.xml")
+
+def encode_attr(doc, node, attr, value):
+	child = add_child(doc, node, attr)
+	add_text(doc, child, value)
+
+
+def encode_track(doc, node, id):
+	child = add_child(doc, node, "track")
+	(artist, album, title, filepath, score, count, genre, track, year, rate,
+		channel, seconds, sample, lenstr) = get_attrs(
+			id, "artist", "album", "title", "filepath", "score",
+			"count", "genre", "track", "year", "rate", "channel",
+			"seconds", "sample", "lenstr")
+
+	encode_attr(doc, child, "id", id)
+	encode_attr(doc, child, "artist", artist)
+	encode_attr(doc, child, "album", album)
+	encode_attr(doc, child, "title", title)
+	encode_attr(doc, child, "filepath", filepath)
+	encode_attr(doc, child, "score", score)
+	encode_attr(doc, child, "count", count)
+	encode_attr(doc, child, "genre", genre)
+	encode_attr(doc, child, "track", track)
+	encode_attr(doc, child, "year", year)
+	encode_attr(doc, child, "rate", rate)
+	encode_attr(doc, child, "channel", channel)
+	encode_attr(doc, child, "seconds", seconds)
+	encode_attr(doc, child, "sample", sample)
+	encode_attr(doc, child, "lenstr", lenstr)
+
+
+def backup():
+	doc = xml.new()
+	child = add_child(doc, doc, "library")
+	for id in library.walk():
+		encode_track(doc, child, id)
+
+	fout = open(lib_file, 'w')
+	fout.write(doc.toprettyxml())
+	fout.close()
+	print "Wrote library to: %s" % lib_file
+
+
+

tests/backup.py

@@ -0,0 +1,10 @@
+# Bryan Schumaker (11/12/2010)
+
+import libsaria
+from libsaria import data
+from libsaria import collection
+from libsaria import backup
+library = libsaria.collection.library
+
+library.load()
+backup.backup()