Andy Wokula wrote:
> I'm trying to get used to persistent undo, but hmmm, I find it still a
> bit difficult to use.
>
> What I want is persistent undo enabled for certain files (not enabled in
> the vimrc, I don't want all the undo files).
>
> So I thought it would be enough to :setlocal undofile when it's
> needed, and an easy and reliable setup would be to place 'undofile' in
> the modeline - this way I cannot forget to set the option for the file.
>
> But it doesn't work. What works is to set 'undofile' BEFORE editing the
> file (which is surprising, and I can't think of a technical reason).
>
> It would be nice if persistent undo would try harder to continue the
> undo history.
>
> Ideally, 'undofile' can be set at any time, and the undo file is loaded
> then (if 'undofile' was off); if possible, recent changes (collected
> while 'undofile' was off) are added to the history of the undo file,
> making up the new history.
>
> Comments?
It's not that easy, because when you set 'undofile' Vim has to compute a
checksum of the text to verify that it matches the undo file. Reloading
the file would be the simple solution. Adding code to separate the
functionality from reading the file is possible, requires some work.
Why not use an BufReadPre autocommand? Usually you can come up with a
file pattern (directory, extension) to decide whether to use 'undofile'.
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