symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/dircache.py
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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"""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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from warnings import warnpy3k
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warnpy3k("the dircache module has been removed in Python 3.0", stacklevel=2)
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del warnpy3k
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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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    mtime = os.stat(path).st_mtime
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    if mtime != cached_mtime:
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        list = os.listdir(path)
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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] + '/'