1 files changed, 36 insertions, 0 deletions
diff --git a/Lib/dircache.py b/Lib/dircache.py
new file mode 100644
index 0000000..b40f76e
--- /dev/null
+++ b/Lib/dircache.py
@@ -0,0 +1,36 @@
+# 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] + '/'