Re: Vimdiff, version 7.4 on Windows 7

On 2013-08-12, Tony Mechelynck wrote:
> On 12/08/13 20:32, Marcio Gil wrote:
> >Em 12/08/2013 12:16, Ben Fritz escreveu:
> >>On Monday, August 12, 2013 7:59:03 AM UTC-5, Marcio Gil wrote:
> >>>I installed vim 7.4 today. Now the "Diff with vim" option don't work.
> >>>E810: Cannot read or write temp files
> >>>E97: Cannot create diffs
> >>
> >>As Tony suggested, check the value you have for 'diffexpr'.
> >>
> >>I just did a fresh install of Vim 7.4 and did:
> >>
> >>gvim -N -u NONE -i NONE
> >>:source $VIMRUNTIME/vimrc_example.vim
> >>
> >>This actually leaves 'diffexpr' empty.
> >>
> >>I was then able to view a diff without seeing any error messages.
> >>
> >>Vim is also using the correct 'diff.exe' distributed with Vim:
> >>
> >>:!start cmd
> >>C:\Users\btfritz>where diff
> >>C:\Program Files (x86)\vim\vim74\diff.exe
> >>
> >>I guess probably your diffexpr is not correct.
> >>
> >:set diffexpr?
> >diffexpr=MyDiff()
> >
> >then I put the line:
> > echo '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
> >
> >before this in the _vimrc (copied from vimrc_example.vim):
> > silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' .
> >arg3 . eq
> >
> >:vert diffsp vimrc~
> >!""C:\Program Files (x86)\Vim\vim74\diff" -a --binnary
> >C:\Users\Marcio\AppData\Local\Temp\VIo4C8B.tmp
> >C:\Users\Marcio\AppData\Local\Temp\VIn4C8C.tmp >
> >C:\Users\Marcio\AppData\Local\Temp\VId4C8D.tmp"
> >E810: Cannot read or write temp files
> >E97: Cannot create diffs
> >
> >I just remove the MyDiff() function from _vimrc then the diff works!
> >It is Ok for me, but is there a failure in the Vim instalation?
> >
>
> No. Your _vimrc is not part of the Vim installation.

That's not true. On Windows, at least prior to Vim 7.4, _vimrc _is_
part of the Vim installation. MyDiff() is/was part of the standard
_vimrc installed under C:\Program Files\Vim (the XP path).

I've been bitten by this before, where I made changes to that
_vimrc, then updated to a newer version of Vim but excluded _vimrc
from the update and couldn't execute diffs because the new version
of Vim had changed MyDiff().

Now I save my old _vimrc, let the installer create a new _vimrc, and
check the differences.

I've also stopped using that system _vimrc and use ~/_vimrc instead,
but I still check for changes to the system _vimrc.

Regards,
Gary

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