Re: automatically save a specific buffer on exit

[Thierry Volpiatto]

Thierry Volpiatto <thierry.volpiatto@gmail.com> writes:

> Hi Andreas,
> Andreas Politz <politza@fh-trier.de> writes:
>
>> 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.
>
> May be you can run something like that when you start working in
> scratch:
>
> ,----
> | (defun run-autosave-in-scratch ()
> |   (with-current-buffer "*scratch*"
> |     (make-auto-save-file-name)
> |     (auto-save-mode 1)))
> `----
>
> That make an autosave of your scratch in your /home/you
> like that: #%2Ascratch%2A#5973UHu#

Cleaner, avoid these files in home directory:

,----
| (defun run-autosave-in-scratch ()
|   (with-current-buffer "*scratch*"
|     (make-auto-save-file-name)
|     (auto-save-mode 1)
|     (setq buffer-auto-save-file-name "~/.scratch-autosave/scratch.el")))
`----

`buffer-auto-save-file-name' will become buffer local variable.


>> 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
>>

-- 
A + Thierry Volpiatto
Location: Saint-Cyr-Sur-Mer - France