Re: automatically save a specific buffer on exit

[Andreas Politz]

Thierry Volpiatto wrote:
> Hi,
> Andreas Politz <politza@fh-trier.de> writes:
>
> > Hi,
> >
> > I have a persistent scratch buffer with a file attached
> > and I would like emacs to have it saved whenever I
> > leave the editor.
> > 'kill-emacs-hook' runs to late and `write-file-functions'
> > doesn't seem to be aproppriate either.
>
> Kill-emacs-hook work fine here. 
> Here the code i use:
>
> ,----
> | (defvar save-scratch-file "~/.emacs.d/save-scratch.el")
> | (defun tv-save-scratch (&optional append)
> |   (interactive "P")
> |   (with-current-buffer "*scratch*"
> |     (widen)
> |     (goto-char (point-min))
> |     (forward-line 1)
> |     (let* ((beg (point))
> |            (end (point-max))
> |            (buffer-contents (buffer-substring beg end)))
> |       (save-excursion
> |         (find-file save-scratch-file)
> |         (if (or current-prefix-arg
> |                 append)
> |             (progn
> |               (goto-char (point-max))
> |               (insert buffer-contents)
> |               (save-buffer)
> |               (kill-buffer (current-buffer)))
> |             (erase-buffer)
> |             (goto-char (point-min))
> |             (insert buffer-contents)
> |             (save-buffer)
> |             (kill-buffer (current-buffer)))))))
> | 
> | (defun tv-restore-scratch-buffer ()
> |   (with-current-buffer "*scratch*"
> |     (goto-char (point-max))
> |     (forward-line)
> |     (insert-file-contents save-scratch-file)))
> | 
> | (add-hook 'kill-emacs-hook 'tv-save-scratch)
> | (add-hook 'emacs-startup-hook 'tv-restore-scratch-buffer)
> `----

Yes, I did it like this before (Btw append- and write-file would
make things easier). The problem here is, there is no auto-saving involved
in this setup and I am currently working with a system that crashes
frequently.

I just wrote a tiny function, which writes the scratch buffer and calls
save-buffers-kill-emacs and bound it to C-xC-c. That seems to be the easiest
solution (Which I haven't thought of before, since I was narrowed down
to finding the right hook).

-ap