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# Module 'dircache'
#
# Return a sorted list of the files in a POSIX directory, using a cache
# to avoid reading the directory more often than necessary.
# Also contains a subroutine to append slashes to directories.
import posix
import path
cache = {}
def listdir(path): # List directory contents, using cache
try:
cached_mtime, list = cache[path]
del cache[path]
except RuntimeError:
cached_mtime, list = -1, []
try:
mtime = posix.stat(path)[8]
except posix.error:
return []
if mtime <> cached_mtime:
try:
list = posix.listdir(path)
except posix.error:
return []
list.sort()
cache[path] = mtime, list
return list
opendir = listdir # XXX backward compatibility
def annotate(head, list): # Add '/' suffixes to directories
for i in range(len(list)):
if path.isdir(path.cat(head, list[i])):
list[i] = list[i] + '/'
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