Re: Vimdiff, version 7.4 on Windows 7

On 12/08/13 23:44, Gary Johnson wrote:
> On 2013-08-12, Tony Mechelynck wrote:
>> On 12/08/13 22:10, Gary Johnson wrote:
>>> On 2013-08-12, Tony Mechelynck wrote:
>
>>>> 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).
>>
>> Installing a _vimrc for you the first time is an option, and the
>> installer does it IIRC by copying the vimrc_example.vim, which leaves
>> you in the cold if a later version of Vim comes with a different
>> vimrc_example.vim.
>
> The last time I installed Vim for Windows (from the Cream site) was
> around the first of the year and this was the file installed in
> C:\Program Files\vim\_vimrc (i.e., $VIM/_vimrc):
>
> set nocompatible
> source $VIMRUNTIME/vimrc_example.vim
> source $VIMRUNTIME/mswin.vim
> behave mswin
>
> set diffexpr=MyDiff()
> function MyDiff()
> let opt = '-a --binary '
> if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
> if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
> let arg1 = v:fname_in
> if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
> let arg2 = v:fname_new
> if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
> let arg3 = v:fname_out
> if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
> let eq = ''
> if $VIMRUNTIME =~ ' '
> if &sh =~ '\<cmd'
> let cmd = '"' . $VIMRUNTIME . '\diff"'
> let eq = '""'
> else
> let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
> endif
> else
> let cmd = $VIMRUNTIME . '\diff'
> endif
> silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
> endfunction

I don't understand the "else" branch of that ":if &sh =~" conditional.
If not using a "cmd" shell, «Program Files (x86)» will become «Program"
Files (x86)» :-???

You will have to change those arg1 arg2 arg3, in 7.4 they have become
something else. If you want a vimrc that will work with versions old and
new you will have to try both, either with ":if exists" or with a try
block (a feature which, however, was new in 6.2).
>
> It is not a copy of vimrc_example.vim, it sources vimrc_example.vim.
> And it defines MyDiff(). So, one is not left in the cold by later
> changes to vimrc_example.vim, but one is by later changes to
> MyDiff().

OK, so at least that has changed since I was on Windows several years
ago. It still sources mswin.vim, which masks several useful Vim
keybindings on the pretext of making life easier for Windows users (IMHO
it doesn't; it just cripples Vim).

Personally I don't source that file (I wouldn't touch it with the
proverbial ten-foot pole), and I use neither ":behave mswin" nor
":behave xterm" but something in-between, as follows:

" selectmode=key,mouse and mousemodel=popup as with mswin
" selection=inclusive as with xterm
" keymodel=startsel - shift-left starts a selection but
" non-shift-left doesn't stop it: it extends it
" instead, just like shift-left-again
set selection=inclusive selectmode=key,mouse
set keymodel=startsel mousemodel=popup

I believe it gives me the best of both worlds, but YMMV.

>
> I share the same .vimrc/_vimrc file among all the systems on which I
> use Vim. I've found MyDiff() useful even on Linux because it lets
> me specify a few extra flags to diff and because it lets me hook the
> entry-into-diff-mode event.
>
>>> I've also stopped using that system _vimrc and use ~/_vimrc instead,
>>> but I still check for changes to the system _vimrc.
>>
>> $VIM/_vimrc is not a "system vimrc", it is one possible location on
>> DOS/Windows for the "user vimrc" on single-user systems where $HOME
>> has no sane value.
>
> You're right. I didn't think of it as a user vimrc since it's
> shared by all users of the Windows system and I didn't look up the
> proper name for it.
>
> Regards,
> Gary
>
Best regards,
Tony.
--
BEDEVERE: And that, my lord, is how we know the Earth to be banana-shaped.
"Monty Python and the Holy Grail" PYTHON (MONTY)
PICTURES LTD

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