Initial revision
[blender.git] / intern / python / freeze / bkfile.py
1 _orig_open = open
2
3 class _BkFile:
4         def __init__(self, file, mode, bufsize):
5                 import os
6                 self.__filename = file
7                 self.__backup = file + '~'
8                 try:
9                         os.unlink(self.__backup)
10                 except os.error:
11                         pass
12                 try:
13                         os.rename(file, self.__backup)
14                 except os.error:
15                         self.__backup = None
16                 self.__file = _orig_open(file, mode, bufsize)
17                 self.closed = self.__file.closed
18                 self.fileno = self.__file.fileno
19                 self.flush = self.__file.flush
20                 self.isatty = self.__file.isatty
21                 self.mode = self.__file.mode
22                 self.name = self.__file.name
23                 self.read = self.__file.read
24                 self.readinto = self.__file.readinto
25                 self.readline = self.__file.readline
26                 self.readlines = self.__file.readlines
27                 self.seek = self.__file.seek
28                 self.softspace = self.__file.softspace
29                 self.tell = self.__file.tell
30                 self.truncate = self.__file.truncate
31                 self.write = self.__file.write
32                 self.writelines = self.__file.writelines
33
34         def close(self):
35                 self.__file.close()
36                 if self.__backup is None:
37                         return
38                 import filecmp
39                 if filecmp.cmp(self.__backup, self.__filename, shallow = 0):
40                         import os
41                         os.unlink(self.__filename)
42                         os.rename(self.__backup, self.__filename)
43
44 def open(file, mode = 'r', bufsize = -1):
45         if 'w' not in mode:
46                 return _orig_open(file, mode, bufsize)
47         return _BkFile(file, mode, bufsize)