Re: Persistence of variables

[Eric Abrahamsen]

Drew Adams <drew.adams@oracle.com> writes:

>> > But no, way too heavy.  I want _one variable_ to persist, and nothing
>> > more.
>> 
>> If you already use savehist-mode, you can add your variable to
>> savehist-additional-variables.
>
> There are several possibilities, including these:
>
> 1. `savehist.el' (what Eric said)
> 2. Customize (option value)
> 3. Bookmark (e.g., Bookmark+ variable-list bookmark)
> 4. Desktop
>
> If you only want to save one variable, just use an option.

To muddy the waters further, there's also eieio-persistent:

(require 'eieio-base)
(defclass my-var-persister (eieio-persistent)
  ((directory
    :initarg :directory
    :initform ""
    :type string)))

(setq persister (make-instance 'my-var-persister
                               :directory "~/dir"
                               :file "~/.emacs.d/persist"))

(eieio-persistent-save persister)

;; Restart Emacs

(setq persister (eieio-persistent-read "~/.emacs.d/persist"))

(slot-value persister 'directory) ; "~/.dir"


Probably too heavy-weight for what you're describing, but it's another
option. If you ever want to save more complex data than just a single
value, it's not a bad choice.

Eric