[ python-Bugs-796219 ] ntpath.expanduser() is still wrong

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Bugs item #796219, was opened at 2003-08-27 16:11
Message generated for change (Comment added) made by gvanrossum
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Category: Windows
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Guido van Rossum (gvanrossum)
Assigned to: Guido van Rossum (gvanrossum)
Summary: ntpath.expanduser() is still wrong

Initial Comment:
I found a system with the following setup:

- os.getenv("HOME") returns "%USERPROFILE%"
- os.getenv("USERPROFILE") returns the home directory

Currently, ntpath.py doesn't expand ~ correctly in this
case.
The fix is pretty simple, I'll try to submit it if I
have time.

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>Comment By: Guido van Rossum (gvanrossum)
Date: 2004-03-20 17:49

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Unclear what I'm asked to do here. Josiah, could you produce
an actual patch against CVS rather than random example code?

If you have forward slashes, you should use
os.path.normpath(). Why doesn't that work?

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Comment By: Tim Peters (tim_one)
Date: 2003-09-30 10:00

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Assigned back to Guido.

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Comment By: Josiah Carlson (josiahcarlson)
Date: 2003-09-30 02:33

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I just noticed that I've got some forward slashes in various
paths on my windows machines...here's some updated code:

    def expandfull(var, rem=3):
        if not rem:
            return os.path.expandvars(var)
        a = os.path.expandvars(var)
        b = []
        d = [b.extend(i.split('\')) for i in a.split('/')]
        c = []
        for i in b:
            if '%' in i:
                c.append(expandfull(i), rem-1)
            else:
                c.append(i)
        return '\'.join(c)


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Comment By: Christos Georgiou (tzot)
Date: 2003-08-30 05:55

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I stand corrected; multiple backslashes inside a path are not 
merged into one on Windows.  Thank you.

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Comment By: Josiah Carlson (josiahcarlson)
Date: 2003-08-29 14:48

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Sourceforge ate my double-backslashes.
All '\' should be '\\'.

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Comment By: Josiah Carlson (josiahcarlson)
Date: 2003-08-29 14:20

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The code you offered won't work correctly for all
environment variable returns.  An example that would kill
your code:
%SYSTEMROOT%\System32

def expandfull(var, rem=3):
    if not rem:
        return expandvars(var)
    a = expandvars(var)
    b = a.split('\')
    c = []
    for i in b:
        if '%' in i:
            c.append(expandfull(i), rem-1)
        else:
            c.append(i)
    return '\'.join(c)

The above would work properly for all environment variables.

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Comment By: Christos Georgiou (tzot)
Date: 2003-08-29 04:38

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If expandvars worked for nt variable syntax too, then just 
before the expanduser final return, the following code would 
suffice, right?

max_recursion = 3
while '%' in userhome and max_recursion > 0:
    userhome = expandvars(userhome)
    max_recursion -= 1

ignoring the fact that path[1:] could contain variables too.

Shouldn't expandvars be made to work with %var% format 
too?  If yes, I'll offer code.

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Comment By: Jarek Zgoda (zgoda)
Date: 2003-08-28 03:47

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This is very common setting on Windows2000 Professional.

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