Using Vim's persistent undo?
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开发者_如何学Go a buffer.
Unfortunately, I haven't quite been able to get it properly enabled, or I must be using it wrong. Here's what I've tried so far:
I added the following to ~/.vimrc
set undofile " Save undos after file closes
set undodir=$HOME/.vim/undo " where to save undo histories
set undolevels=1000 " How many undos
set undoreload=10000 " number of lines to save for undo
After this, I supposedly should be able to open any file, edit it, then save-close it, and when I open it again I should be able to undo/redo as if I'd never left. Unfortunately, this doesn't seem to be the case, as no undofile is ever written.
Notes:
I'm on Win 7 using Vim 7.3 from the Vim without cream project. Persistent undo is baked-in.
$HOME/.vim/undo exists on my file system
Put this in your .vimrc
to create an undodir
if it doesn't exist and enable persistent undo. Tested on both Windows and Linux.
" Put plugins and dictionaries in this dir (also on Windows)
let vimDir = '$HOME/.vim'
if stridx(&runtimepath, expand(vimDir)) == -1
" vimDir is not on runtimepath, add it
let &runtimepath.=','.vimDir
endif
" 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
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.
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
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.
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