automatically save a specific buffer on exit

automatically save a specific buffer on exit

[Andreas Politz]

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.

-ap

Re: automatically save a specific buffer on exit

[Thierry Volpiatto]

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)
`----


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

Re: automatically save a specific buffer on exit

[Lennart Borgman]

On Wed, Feb 4, 2009 at 9:26 PM, Andreas Politz <politza@fh-trier.de> wrote:
> 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-buffer-query-function?

Re: automatically save a specific buffer on exit

[Kevin Rodgers]

Lennart Borgman wrote:
> On Wed, Feb 4, 2009 at 9:26 PM, Andreas Politz <politza@fh-trier.de> wrote:
>> 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-buffer-query-function?

The variable name is plural: kill-buffer-query-functions

But wouldn't kill-emacs-query-functions be better suited for this?

-- 
Kevin Rodgers
Denver, Colorado, USA

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

Re: automatically save a specific buffer on exit

[Thierry Volpiatto]

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#

> 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

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