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45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
"""Read and cache directory listings.
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The listdir() routine returns a sorted list of the files in a directory,
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using a cache to avoid reading the directory more often than necessary.
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The annotate() routine appends slashes to directories."""
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import os
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__all__ = ["listdir", "opendir", "annotate", "reset"]
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cache = {}
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def reset():
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"""Reset the cache completely."""
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global cache
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cache = {}
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def listdir(path):
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"""List directory contents, using cache."""
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try:
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cached_mtime, list = cache[path]
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del cache[path]
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except KeyError:
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cached_mtime, list = -1, []
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try:
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mtime = os.stat(path)[8]
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except os.error:
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return []
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if mtime != cached_mtime:
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try:
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list = os.listdir(path)
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except os.error:
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return []
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list.sort()
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cache[path] = mtime, list
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return list
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opendir = listdir # XXX backward compatibility
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def annotate(head, list):
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"""Add '/' suffixes to directories."""
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for i in range(len(list)):
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if os.path.isdir(os.path.join(head, list[i])):
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list[i] = list[i] + '/'
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