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44 lines
1.1 KiB
44 lines
1.1 KiB
"""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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