Problem with case insensitive volumes

[Gabriel Genellina]

En Tue, 05 May 2009 12:55:13 -0300, spillz <damienlmoore at gmail.com>
escribió:
>
> /my/path/to/usbkey/and/file
>
> everything up to "/my/path/to/usbkey" is case sensitive. only the "and/
> file" is case insensitive. but my list of stored paths might include
> all images under "/my". thus
>
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/and/FILE1
> /my/path/to/usbkey/and/file1==/my/path/to/usbkey/AND/FILE1
> but
> /my/path/to/usbkey/and/file1!=/my/path/TO/usbkey/AND/FILE1
>
> so to do this right I'd need to establish which parts of the path are
> case insensitive. being able to retrieve the actual path from an
> equivalent representation would be so much simpler.

I use this function on Windows to obtain the true case name of a file:

<code>
  from win32api import FindFiles
  from win32file import FILE_ATTRIBUTE_DIRECTORY
  from os.path import normpath, split, join

def truecase(fullpath, _cache={}):
      """
      Normalize fullpath, returning names using the
      same case as actually used in the filesystem.
      """
      fullpath = normpath(fullpath)
      dirname, filename = split(fullpath)
      dirname = dirname.lower()
      if not filename:
          # drive letter
          result = _cache[dirname] = dirname.upper()
          return result
      if dirname in _cache: dirname = _cache[dirname]
      elif dirname: dirname = truecase(dirname)
      finddata = FindFiles(fullpath)
      if not finddata:
          import errno, os
          raise IOError(errno.ENOENT, os.strerror(errno.ENOENT), fullpath)
      if len(finddata)!=1:
          raise ValueError("Too many results for %r" % fullpath)
      attr = finddata[0][0]
      filename = finddata[0][8]
      result = join(dirname, filename)
      if attr & FILE_ATTRIBUTE_DIRECTORY:
          _cache[result.lower()] = result
      return result
</code>

truecase("c:")=="C:"
truecase("C:\\")=="C:\\"
truecase("c:\\")=="C:\\"
truecase("C:\\TeMp")=="C:\\TEMP"
truecase("C:\\TeMp\\")=="C:\\TEMP\\"
truecase(r"C:\Documents and Settings\gabriel")==r"C:\Documents and
Settings\gabriel"
truecase(r"c:\dOcUmEnTs aNd SeTtInGs\GaBrIeL\mIS DOCUMENTOS\105_3 - nist -
sPECIFICATIONS vOLUMETRIC fIELD sTANDARD.PDF")==r"C:\Documents and
Settings\gabriel\Mis documentos\105_3 - NIST - Specifications Volumetric
Field Standard.pdf"
truecase(r"E:\prog\test\compface\Debug\No existe.txt")

-- 
Gabriel Genellina