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Re: [AUCTeX-devel] Possible truncation of the value of list variable

From: Arash Esbati
Subject: Re: [AUCTeX-devel] Possible truncation of the value of list variable
Date: Sat, 30 Sep 2017 23:06:46 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3

Ikumi Keita <address@hidden> writes:

> And I'm afraid that the combination of `delete-dups' and `append' might
> cause similar truncation of list variable in other places, i.e.,
> caption.el, enumitem.el, floatrow.el, mdframed.el and
> menukeys.el.  Arash, could you please check these files as the author of
> them?

Hi Keita,

thanks for the heads-up.  I checked those styles and they don't produce
unwanted changes to global variables.  You can eval these forms to see
the basic operation:

(require 'cl)
(setq my/test '(("align" ("left" "right" "center"))))
(make-variable-buffer-local 'my/test)
(defun my/test ()
  (dolist (newalign '(("justified") ("center")))
    (let* ((key "align")
           (val (car newalign))
           (val-match (cdr (assoc key my/test)))
           (temp (copy-alist my/test))
           (opts (assq-delete-all (car (assoc key temp)) temp)))
      (pushnew (list key (delete-dups (apply #'append (list val) val-match)))
               opts :test #'equal)
      my/test ;; for testing only
      (setq my/test (copy-alist opts)))))

The delete-dups/append thing operates only on variables marked with

Best, Arash

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