Re: what are the differences among undofile, swap file, and session file?

On May 22, 7:46 am, yanzhisheng <yanzhish...@yahoo.com.cn> wrote:
> >> Can somebody can tell me what undofile differs from swap file? and
> >> session file. I think session file is very strong! behaves like MATLAB
> >> more or less! thanks.
>
> >I think the help explains it all. See
>
> >:h swap-file
> >:h undo-persistence
> >:h 21.4
>
> I have a question, since there is a swap file for every file
> that has been read to VIM, and the all changes such as undo/do
> would be recorded in the swap file, why needed another file named
> undofile? for persistence undo operation, the developers can also
> improve vim to save the swap file, so the undofile is not necessary.
> is that okay?
> thanks.
>
>

If I understand correctly, the swap file does not contain undo
information at all. It simply contains the differences between the on-
disk version of the file and the current version being edited. I may
be wrong about this.

However, the undo file contains the full state of Vim's undo tree. Not
just the current undoable changes, but any branch of undoable changes.
See http://vim.wikia.com/wiki/Using_undo_branches .

A session file is completely unrelated, it has nothing to do with
either of these. A session file saves current option settings and
mappings, as well as the current buffer/window/tab list. It does not
save any changes or undo information.

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