Using Vim's persistent undo?

Question

One of the new features in Vim 7.3 is \'persistent undo\', which allows for the undotree to be saved to a file when exiting a buffer.

Unfortunately, I haven\'t quite

Answer 1

Put this in your .vimrc to create an undodir if it doesn't exist and enable persistent undo. Tested on both Windows and Linux.

" Put plugins and dictionaries in this dir (also on Windows)
let vimDir = '$HOME/.vim'
let &runtimepath.=','.vimDir

" Keep undo history across sessions by storing it in a file
if has('persistent_undo')
    let myUndoDir = expand(vimDir . '/undodir')
    " Create dirs
    call system('mkdir ' . vimDir)
    call system('mkdir ' . myUndoDir)
    let &undodir = myUndoDir
    set undofile
endif

Answer 2

I suppose $HOME doesn't work as advertised.

On my system, :echo $HOME shows H:\, but : e $HOME/ says: ~/ invalid filename.

You could try with an absolute path to see whether it cures it

Answer 3

If you are looking for %TEMP%.(filename).un~ you won't find it

The filename will be something line C%%Users%%(username)%_vimrc

I have no idea why

Answer 4

I tried this in my _gvimrc:

" Persistent undo
try 
    set undodir=C:\vim\undodir
    set undofile
catch
endtry

It started working as advertised when I deleted the try-catch bracket, thus:

" Persistent undo
set undodir=C:\vim\undodir
set undofile

I had to create the directory.

Answer 5

This now works as expected: file.txt open in a Vim 7.4 buffer on Windows 7, :setlocal undofile, then save a change to the buffer, and the undofile .file.txt.un~ is created alongside because :set undodir? reports that "undodir=." by default - ie no need to specify this manually. You can also :set undofile in a modeline.