On 2012-10-24, Timothy Madden wrote:
> Hello
> 
> I am trying to see if the current system is 32-bit or 64-bit Windows.
> On 64-bit Windows the environment variable $ProgramFiles(x86) is
> known to exits, but Vim will just check for $ProgramFiles and the
> appendthe '(x86)' part. Is there a way to check if the environment
> variable $ProgramFiles(x86) exists in the current environment ?
> 
> I tried both expand('$ProgramFiles(x86)') and
> exists('$ProgramFiles(x86)'), both of them check the '$ProgamFiles'
> part only.

I think the following or a variation should do it.  I was only able
to test it on names without parentheses as I didn't see any variable
names with them in my environment.

    split(system('set ProgramFiles(x86)', '=')[1]

gets the value and

    system('set ProgramFiles(x86)') =~ 'not defined'

will evaluate to true if the variable is not defined.

Regards,
Gary

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