127     

   128     def shorturls_for (self, paths) :

   129         ret = []

   131         for key in self.db.keys() :

   132             if key.startswith('_') :

   133                 continue

   134 

   135             type, dir, fname = self.db[key]

   136             path = os.path.join(dir.lstrip('.').lstrip('/'), fname) 

   137             if path in paths :

   138                 ret.append(key)

   139                 paths.remove(path)

   140         

   141         if paths :

   142             raise ValueError("Paths not found: %s" % " ".join(paths))

   143 

   144         return ret

   145