UNDO

*undo.txt*      For IdeaVIM version 0.12.0.  Last change: 2006 Nov 12


                  IdeaVIM REFERENCE MANUAL    by Rick Maddy


Undo and redo                                           *undo-redo*

The basics are explained in section |02.5| of the user manual.

1. Undo and redo commands       |undo-commands|
2. Two ways of undo             |undo-two-ways|
3. Remarks about undo           |undo-remarks|

1. Undo and redo commands                               *undo-commands*

<Undo>          or                                      *undo* *<Undo>* *u*
u                       Undo [count] changes.

                                                        *:u* *:un* *:undo*
:u[ndo]                 Undo one change.

                                                        *CTRL-R*
CTRL-R                  Redo [count] changes which were undone.
                        screen}

                                                        *:red* *:redo* *redo*
:red[o]                 Redo one change which was undone.

The last changes are remembered.  You can use the undo and redo commands above
to revert the text to how it was before each change.  You can also apply the
changes again, getting back the text before the undo.

2. Two ways of undo                                     *undo-two-ways*

You can go back in time with the undo command.  You can then go forward again
with the redo command.  If you make a new change after the undo command,
the redo will not be possible anymore.

3. Remarks about undo                                   *undo-remarks*

The number of changes that are remembered is set with the 'undolevels' option.
If it is zero, the Vi-compatible way is always used.  If it is negative no
undo is possible.  Use this if you are running out of memory.

Marks for the buffer ('a to 'z) are also saved and restored, together with the
text.

When all changes have been undone, the buffer is not considered to be changed.
Note that this is relative to the last write of the file.  Typing "u"
after ":w" actually changes the buffer, compared to what was written, so the
buffer is considered changed then.

The numbered registers can also be used for undoing deletes.  Each time you
delete text, it is put into register "1.  The contents of register "1 are
shifted to "2, etc.  The contents of register "9 are lost.  You can now get
back the most recent deleted text with the put command: '"1P'.  (also, if the
deleted text was the result of the last delete or copy operation, 'P' or 'p'
also works as this puts the contents of the unnamed register).  You can get
back the text of three deletes ago with '"3P'.

                                                *redo-register*
If you want to get back more than one part of deleted text, you can use a
special feature of the repeat command ".".  It will increase the number of the
register used.  So if you first do ""1P", the following "." will result in a
'"2P'.  Repeating this will result in all numbered registers being inserted.

Example:        If you deleted text with 'dd....' it can be restored with
                '"1P....'.

If you don't know in which register the deleted text is, you can use the
:display command.  An alternative is to try the first register with '"1P', and
if it is not what you want do 'u.'.  This will remove the contents of the
first put, and repeat the put command for the second register.  Repeat the
'u.' until you got what you want.