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Re: backup abbrev_defs
From: |
Sharon Kimble |
Subject: |
Re: backup abbrev_defs |
Date: |
Thu, 19 Dec 2019 18:18:40 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Michael Heerdegen <michael_heerdegen@web.de> writes:
> Sharon Kimble <boudiccas@skimble.plus.com> writes:
>
>> How can I backup my abbrev_defs file every time it is changed, just
>> like any other file in emacs, please? And, logically, to the same
>> place, my '~/.emacs.d/backups' directory?
>
> Recently I had a similar requirement for the Gnus Registry save file.
> Like `write-abbrev-file' saving is done there with a `write-region' call
> from within a temporary helper buffer so no backups are created
> automatically.
>
> My solution (canonical I think) was to register a file name handler for
> that save file and the `write-region` operation. For information about
> `file-name-handler-alist' see
>
> (info "(elisp) Magic File Names")
>
> Code:
>
> #+begin_src emacs-lisp
> (setf (alist-get (regexp-quote ".gnus.registry.eieio")
> file-name-handler-alist nil nil #'equal)
> (defun my-gnus-registry-save-file-handler (operation &rest args)
> (pcase-let ((`(,_start ,_end ,filename . ,_rest) args))
> (when (eq operation 'write-region)
> (let ((buffer-backed-up nil)
> (buffer-file-name filename)
> (file-precious-flag t)
> (kept-new-versions 300))
> (backup-buffer))))
> ;; Invoke original handler
> (let ((inhibit-file-name-handlers
> (cons 'my-gnus-registry-save-file-handler
> inhibit-file-name-handlers))
> (inhibit-file-name-operation operation))
> (apply operation args))))
> #+end_src
>
> It should be obvious how to translate it for your file.
>
> The backup is created with `backup-buffer' which doesn't refer to the
> temp buffer but to the file named by `buffer-file-name' (thus the
> let-binding).
>
> Since `backup-buffer' is a high-level function, all your settings
> concerning backup creation are respected. To control where the backup
> is created `backup-directory-alist' is consulted - you can also add a
> binding in the above defun of course. The `kept-new-versions' binding
> to 300 I use above is only because Gnus registry saving is currently
> still a bit buggy and I want to force the creation of so many backup
> files that I can be sure I don't lose anything even if I notice problems
> after a longer time has passed.
>
> I don't know if the above solution is the simplest one btw, it's just
> the one that came to my mind at first.
>
Thanks for replying Michael.
I've been trying out various things, and I've finally settled on
rewriting my 'abbrev_defs' code, and also backing up my emacs to my
server hourly, as well as with rsnapshot every 3 hours.
My code is now -
#+BEGIN_SRC emacs-lisp
;; turn on abbrev mode globally
(setq-default abbrev-mode t)
(setq save-abbrevs 'silently)
(setq abbrev-file-name "~/.emacs.d/abbrev_defs")
(read-abbrev-file "~/.emacs.d/abbrev_defs")
(abbrev-table-put global-abbrev-table :case-fixed t)
#+END_SRC
I did try adapting your code above but wasn't able to get it to work
successfully, sorry!
Thanks
Sharon.
--
A taste of linux = http://www.sharons.org.uk
DrugFacts = https://www.drugfacts.org.uk
Debian 10.1, fluxbox 1.3.7, emacs 26.3, org 9.3
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