AppPkg/Applications/Python/Python-2.7.2/Lib/dircache.py

   1 """Read and cache directory listings.
   2
   3 The listdir() routine returns a sorted list of the files in a directory,
   4 using a cache to avoid reading the directory more often than necessary.
   5 The annotate() routine appends slashes to directories."""
   6 from warnings import warnpy3k
   7 warnpy3k("the dircache module has been removed in Python 3.0", stacklevel=2)
   8 del warnpy3k
   9
  10 import os
  11
  12 __all__ = ["listdir", "opendir", "annotate", "reset"]
  13
  14 cache = {}
  15
  16 def reset():
  17     """Reset the cache completely."""
  18     global cache
  19     cache = {}
  20
  21 def listdir(path):
  22     """List directory contents, using cache."""
  23     try:
  24         cached_mtime, list = cache[path]
  25         del cache[path]
  26     except KeyError:
  27         cached_mtime, list = -1, []
  28     mtime = os.stat(path).st_mtime
  29     if mtime != cached_mtime:
  30         list = os.listdir(path)
  31         list.sort()
  32     cache[path] = mtime, list
  33     return list
  34
  35 opendir = listdir # XXX backward compatibility
  36
  37 def annotate(head, list):
  38     """Add '/' suffixes to directories."""
  39     for i in range(len(list)):
  40         if os.path.isdir(os.path.join(head, list[i])):
  41             list[i] = list[i] + '/'