I have the following function, where I would like to use completion to set the style. But the way I have done does not reset the style using M-x rk-bracemk-companion.

    (defcustom rk-bracemk-companion-style
      '("parenthesis" "expression" "mixed")
      "Set bracemk-companion-style."
      :type '(repeat string)
      :group 'convenience)
    (defun rk-bracemk-companion (style)
      "Indicates counterpart character when matching bracketing pairs."
        (completing-read "bracemk-companion, Sel Style: "
      (show-paren-mode 1)
      (setq show-paren-delay 1.3)
      ;; Options: Style | `parenthesis', `expression', `mixed'
      (setq show-paren-style style)
      (setq show-paren-when-point-inside-paren t))

1 Answer 1


Your code has a couple of problems.

  1. Option show-paren-style expects a symbol, not a string. So (a) change your defcustom to use symbols, and (b) use intern on the value returned by completing-read (which is a string).

  2. Don't use setq with user options, as a general rule (good habit). Why? Because some defcustoms use :set functions, and just changing the value with setq won't do the right thing in that case.

  3. You probably want a non-nil REQUIRE-MATCH arg for completing-read.

(defcustom rk-bracemk-companion-style
  '(parenthesis expression mixed)
  "Completion candidates for `rk-bracemk-companion'."
  :type '(repeat symbol)
  :group 'convenience)

(defun rk-bracemk-companion (style)
  "Choose a `show-paren-style' and use it."
   (list (completing-read "Style: " rk-bracemk-companion-style nil t)))
  (customize-set-variable 'show-paren-delay 1.3)
  (customize-set-variable 'show-paren-style (intern style))
  (customize-set-variable 'show-paren-when-point-inside-paren t)
  (show-paren-mode -1)
  (show-paren-mode 1))
  • I am getting customize-set-variable: Wrong type argument: stringp, expression when applying your suggestions.
    – Dilna
    Mar 24, 2022 at 22:57
  • Try starting Emacs with emacs -Q. And be sure you copied the code correctly. Works for me.
    – Drew
    Mar 24, 2022 at 23:07
  • In my minor-mode definition, I use (rk-bracemk-companion 'expression). This could be the problem that is being introduced.
    – Dilna
    Mar 24, 2022 at 23:23
  • I get a bit confused on what to do when calling a function in my elisp code that has the interactive declaration. Can one simple call it with parameters irrespective of how the interactive statement is set up?
    – Dilna
    Mar 25, 2022 at 0:50
  • Post questions as questions.
    – Drew
    Mar 26, 2022 at 2:07

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