"undo" really can replace "redo"

"undo" really can replace "redo"

[niDapeng]

I know Emacs use "killing-ring" concept to cicle undo, and 'redo' operation is implicitly done under this cicle. But, is it really good way? 
When I set killing-ring size enough large, the "redo" is turing very boring when I miss the correct position of ring. 
For instance, if my current killing-ring size is 200, I try to undo last the 40th step operation, but, unfortunately, I undo 41 times. At this case, I have 2 choices, one is keep undoing until the cycle is back(so boring, and I have to very careful to prevent next mistake). Another way, is I manually to mend the 41th operation(maybe type some text again). 

Hi, Emacs gurus, my "redo" concept is correctly? I have to be familiar such operation? Certainly, I know there is redo.el available for this. But why emacs doesn't take "redo" as default package?


Thanks
Dapeng



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Re: "undo" really can replace "redo"

[Eli Zaretskii]

> Date: Mon, 23 Feb 2004 13:21:36 +0800 (CST)
> From: "niDapeng"<steveneo@21cn.com>
> 
> I know Emacs use "killing-ring" concept to cicle undo, and 'redo' operation is implicitly done under this cicle.

No, Emacs has a special "M-x undo" command (bound to "C-x u" and "C-_").

> For instance, if my current killing-ring size is 200, I try to undo last the 40th step operation, but, unfortunately, I undo 41 times. At this case, I have 2 choices, one is keep undoing until the cycle is back(so boring, and I have to very careful to prevent next mistake). Another way, is I manually to mend the 41th operation(maybe type some text again). 

Try "Edit->Select and Paste" from the menu bar, it gives you random
access to the kill ring.

Re: "undo" really can replace "redo"

[Stefan Monnier]

> For instance, if my current killing-ring size is 200, I try to undo last
> the 40th step operation, but, unfortunately, I undo 41 times. At this
> case, I have 2 choices, one is keep undoing until the cycle is back(so
> boring, and I have to very careful to prevent next mistake). Another way,
> is I manually to mend the 41th operation(maybe type some text again). 

No, you just need to stop the undo sequence and start it again:
I.e. do C-f (or any other non-undo command) to stop the undo sequence,
and then do undo again: it will undo your recent undos (i.e. it will redo).


        Stefan