[Bug 172861] Re: add: accepts aliases due to case insensitivity

[John Arbash Meinel]

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Alexander Belchenko wrote:
> John A Meinel ?8H5B:
>> The other problem, is that I don't know of any way to get the real name of a file. You could use "os.listdir(os.path.dirname(path))" and then search through it for possible names, but you don't know if foO is there because of a rename, or if it is actually a different file.
>> It would be nice if you could do:
> 
>> st = os.stat('foo')
>> and have "st" have a st_name or some other property that gives you the exact name on disk.
> 
>> Does anyone know if that is possible?
> 
> I know. Recently I dig through MSDN and found this way to determine real filename without
> using os.listdir (it's too expensive in Python). You need pywin32 library for this, or
> writing C-extension. Using ctypes is also possible but it's too verbose in Python.
> 
> Here the actual code:
> 
> import win32file
> names_list = win32file.FindFilesW(path_in_question)  # returns list of WIN32_FIND_DATA structs
> # if path_in_question contains wildcard characters * or ? then we get list of al matching files,
> # like with glob function
> real_name = names_list[0][8]
> 
> Here is example running in bzr.dev tree:
> 
> In [4]: import win32file
> 
> In [5]: names_list = win32file.FindFilesW('BzR')
> 
> In [6]: names_list[0][8]
> Out[6]: u'bzr'
> 
> In [7]: len(names_list)
> Out[7]: 1


We might think about using something like this. But it pains me to think about
making 50k calls to FindFilesW just to make sure that when we stat to see if
'X' exists that it isn't really called 'x'....

Maybe once we get commit to use an _iter_changes() style api, it will detect
these in a more straightforward manner.

And then we could use something like FindFilesW for things like misses, to see
if they really missed, or if it is just a case-insensitivity thing.

We certainly could use it for sanitizing user parameters (for things like bzr
add, or maybe even bzr status).

Because those are usually limited (obviously if someone is scripting you may
get a bunch, but there is still the limit of number of characters on the
command line).

Do we have any similar function for Mac OS X? Especially since Mac likes to
rename files based on unicode normalization. (And as someone commented it isn't
pure NFC, so you really need to ask Mac what the name is.)

John
=:->
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