Reverted recursive sort, opted for natsorted lib

Was having performance issue with very large directories.

This does have the issue of order "File (1)" before "File", have raised
an issue with natsorted.

mangle/book.py

@@ -22,6 +22,7 @@ from image import ImageFlags
 from about import DialogAbout
 from options import DialogOptions
 from convert import DialogConvert
+from natsort import natsorted
 
 
 class Book(object):
@@ -352,13 +353,11 @@ class MainWindowBook(QtGui.QMainWindow):
 
 
     def addImageFiles(self, filenames):
-        filenames.sort()
-
         filenamesListed = []
         for i in xrange(0, self.listWidgetFiles.count()):
             filenamesListed.append(self.listWidgetFiles.item(i).text())
 
-        for filename in filenames:
+        for filename in natsorted(filenames):
             if filename not in filenamesListed:
                 filename = QtCore.QString(filename)
                 self.listWidgetFiles.addItem(filename)
@@ -370,14 +369,11 @@ class MainWindowBook(QtGui.QMainWindow):
         filenames = []
 
         for directory in directories:
-            directory = unicode(directory)
-            for item in sorted(os.listdir(directory), key=util.tokenize):
-                item = unicode(item)
-                path = os.path.join(directory, item)
+            for root, subdirs, subfiles in os.walk(unicode(directory)):
+                for filename in subfiles:
+                    path = os.path.join(root, filename)
                     if self.isImageFile(path):
                         filenames.append(path)
-                elif os.path.isdir(path):
-                    self.addImageDirs([path])
 
         self.addImageFiles(filenames)
 

mangle/util.py

@@ -21,11 +21,3 @@ import re
 def buildResPath(relative):
     directory = os.path.dirname(__file__)
     return os.path.join(directory, relative)
-
-
-digits = re.compile(r'(\d+)')
-def tokenize(filename):
-    return tuple(int(token) if match else token
-        for token, match in
-        ((fragment, digits.search(fragment))
-        for fragment in digits.split(filename)))