How do you redo changes after undo with Emacs

Question

This article says that  Emacs has redo because you can reverse direction while undoing  thereby undoing the undo    What does this mean  How can a user  redo  with Emacs

User · Answer

Beware of an undo-tree quirk for redo   Many popular    starter kits     prelude  purcell  spacemacs  come bundled with undo-tree  Most  all   even auto-enable it  As mentioned  undo-tree is a handy way to visualize and traverse the undo redo tree  Prelude even gives it a key-chord  uu   and also C-x u   The problem is  undo-tree seems to wreck Emacs    default and well-known binding for redo  C-g C-    Instead  you can use these symmetrical keys for undo redo   C-      undo C-S-    redo   These are useful since sometimes you want to quickly redo without opening up the visualizer

User · Answer

To undo once  C-  To undo twice  C-  C-       To redo once  immediately after undoing  C-g C-  To redo twice  immediately after undoing  C-g C-  C-   Note that C-g is not repeated       To undo immediately again  once  C-g C-  To undo immediately again  twice  C-g C-  C-       To redo again  the same      If you have pressed any keys  whether typing characters or just moving the cursor  since your last undo command  there is no need to type C-g before your next undo redo  C-g is just a safe key to hit that does nothing on its own  but counts as a non-undo key to signal the end of your undo sequence  Pressing another command such as C-f would work too  it   s just that it would move the cursor from where you had it   If you hit C-g or another command when you didn   t mean to  and you are now undoing in the wrong direction  simply hit C-g to reverse your direction again  You will have to undo all the way through your accidental redos and undos before you get to the undos you want  but if you just keep hitting C-   you will eventually reach the state you want  In fact  every state the buffer has ever been in is reachable  if you hit C-g once and then press C-  enough times   Alternative shortcuts for undo  other than C-   are C-   C-x u  and M-x undo   See Undo in the Emacs Manual for more details on Emacs   s undo system

User · Answer

Emacs 28 adds a redo command  called undo-redo    If you want to have more typical undo redo  the following commands can be used    global-set-key  kbd  C-z    undo-only   global-set-key  kbd  C-S-z    undo-redo

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To undo   C-    To redo after a undo   C-g  C-    Type multiple times on  C-   to redo what have been undone by  C-   To redo an emacs command multiple times  execute your command then type C-xz and then type many times on z key to repeat the command  interesting when you want to execute multiple times a macro

User · Answer

By default  redo in Emacs requires pressing C-g  then undo   However it s possible use Emacs built-in undo to implement a redo command too   The package undo-fu  uses Emacs built-in undo functionality to expose both undo and redo

User · Answer

Short version  by undoing the undo  If you undo  and then do a non-editing command such as C-f  then the next undo will undo the undo  resulting in a redo   Longer version   You can think of undo as operating on a stack of operations  If you perform some command  even a navigation command such as C-f  after a sequence of undo operations  all the undos are pushed on to the operation stack   So the next undo undoes the last command   Suppose you do have an operation sequence that looks like this    Insert  foo  Insert  bar  Insert  I love spam    Now  you undo   It undoes the last action  resulting in the following list    Insert  foo  Insert  bar    If you do something other than undo at this point - say  C-f  the operation stack looks like this    Insert  foo  Insert  bar  Insert  I love spam  Undo insert  I love spam    Now  when you undo  the first thing that is undone is the undo   Resulting in your original stack  and document state     Insert  foo  Insert  bar  Insert  I love spam    If you do a modifying command to break the undo sequence  that command is added after the undo and is thus the first thing to be undone afterwards   Suppose you backspaced over  bar  instead of hitting C-f   Then you would have had   Insert  foo  Insert  bar  Insert  I love spam  Undo insert  I love spam  Delete  bar    This adding re-adding happens ad infinitum   It takes a little getting used to  but it really does give Emacs a highly flexible and powerful undo redo mechanism

User · Answer

I find redo el extremly handy for doing  normal  undo redo  and I usually bind it to C-S-z and undo to C-z  like this    when  require  redo nil  noerror       global-set-key  kbd  C-S-z    redo     global-set-key  kbd  C-z    undo    Just download the file  put it in your lisp-path and paste the above in your  emacs

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If you want to redo the last operation  do the following    ESC Do another undo  C

User · Answer

Doom Emacs users  I hope you ve scrolled this far or searched for  doom  on the page     Doom Emacs breaks the vanilla Emacs redo shortcut  C-g C-  C-  C-  etc  or C-g C-  C-  C-  etc     and instead that just keeps undoing  Doom Emacs also breaks the undo-tree redo shortcut mentioned in one of the other answers as being useful for spacemacs etc  S-C-   AKA C-      and instead that throws the error  quot C-  is not defined quot    What you need is   to be in evil-mode  C-z to toggle in and out of evil-mode   in evil-mode should see blue cursor  not orange cursor  and to be in  command mode  AKA  normal mode   as opposed to  insert mode    Esc to switch to command mode   should see block cursor  not line cursor   and then it s u for undo and C-r for redo

User · Answer

For those wanting to have the more common undo redo functionality  someone has written undo-tree el   It provides the look and feel of non-Emacs undo  but provides access to the entire  tree  of undo history   I like Emacs  built-in undo system  but find this package to be very intuitive   Here s the commentary from the file itself      Emacs has a powerful undo system    Unlike the standard undo redo system   in most software  it allows you to   recover any past state of a buffer    whereas the standard undo redo system   can lose past states as soon as you   redo   However  this power comes at a   price  many people find Emacs  undo   system confusing and difficult to use    spawning a number of packages that   replace it with the less powerful but   more intuitive undo redo system       Both the loss of data with standard   undo redo  and the confusion of Emacs    undo  stem from trying to treat undo   history as a linear sequence of   changes  It s not  The    undo-tree-mode  provided by this   package replaces Emacs  undo system   with a system that treats undo history   as what it is  a branching tree of   changes  This simple idea allows the   more intuitive behaviour of the   standard undo redo system to be   combined with the power of never   losing any history  An added side   bonus is that undo history can in some   cases be stored more efficiently    allowing more changes to accumulate   before Emacs starts discarding   history

[emacs] How do you 'redo' changes after 'undo' with Emacs?

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