[TUHS] screen editors

[Bakul Shah]

Short answer: there is no special case in nvi.
P or p put back the contents of the last delete.
u undoes whatever was the last change (including the last undo or redo).
. repeats whatever was the last modifying command.

A detailed answer would merely confuse you. At least my attempt at it!
Suggest you try out various combinations in nvi and compare with vim.

> On Jan 8, 2020, at 7:55 PM, Mary Ann Horton <mah at mhorton.net> wrote:
> 
> Are you referring to the special case where an undo of "p" (put) will sucessively re-insert the most recent things you've deleted?
> 
> I just tried that in vim and it didn't seem to support the special case the way vi did.
> 
>     Mary Ann
> 
> On 1/8/20 7:49 PM, Bakul Shah wrote:
>> It doesn’t work the same way. I just tried it (vim-8.0.something).
>> The way it is supposed to work is this:  the first u undoes the last change.
>> Then you keep hitting . to keep undoing more. Then if you went back too far,
>> you hit u again, to undo the undo and further . will keep redoing. You can
>> go back and forth this way as many times as you wish.
>> 
>>> On Jan 8, 2020, at 7:27 PM, Mary Ann Horton <mah at mhorton.net> wrote:
>>> 
>>> vim has an option to undo the vi way. "set cpoptions=u". There is a full set of vi-compatible options if you want them. "set cp" turns on full vi compatiblity.
>>> Funny, I see vim as the vi that comes with UNIX, and never learned the enhancements, but I just tried it out and I don't have the compatibility option set. I don't seem to have noticed. I guess I don't do the "undo toggle" all that often.
>>> 
>>>     Mary Ann
>>> On 1/8/20 6:12 PM, Clem Cole wrote:
>>>> make a new command, don't break the old one....  maybe offer a way to map the new one over the old -- but don't make it the default.
>>>> and my lawn was lush and green before the snow came ;-)
>>>> 
>>>> 
>>>> 
>>>> On Wed, Jan 8, 2020 at 9:07 PM Larry McVoy <lm at mcvoy.com> wrote:
>>>> On Wed, Jan 08, 2020 at 09:04:46PM -0500, Clem Cole wrote:
>>>>> On Wed, Jan 8, 2020 at 8:41 PM Bakul Shah <bakul at bitblocks.com> wrote:
>>>>> 
>>>>>> The first thing I do on a new machine is to install nvi. Very grateful to
>>>>>> Keith Bostic for implementing it. I do use multiple windows ??? only
>>>>>> horizontal splits but that is good enough for me as all my terminal
>>>>>> windows are 80 chars wide. Not a vim hater but never saw the need.
>>>>> I pretty much do the same thing. I think what I hate about vim is that it's
>>>>> almost, vi but not the same. My fingers screw up when I use it.  For
>>>>> instance, he 'fixed' undo.
>>>> Holy crap Clem, you need to embrace that.  His undo goes back forever.
>>>> And you can undo the undo and go forward forever.
>>>> 
>>>> Not liking that puts you in the "get off my lawn" old guy camp.  Which
>>>> is fine if that's who you want to be (sometimes I'm that guy).