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Changing buffer mode

From: carlmarcos
Subject: Changing buffer mode
Date: Wed, 20 Jul 2022 05:55:17 +0200 (CEST)

With the following function I can change the mode of a buffer.  I would like to 
change it to use `completing-read` using a list composed of a selection of mode 
names.  How can I go about doing that? 

(defun mode-sweep ()
  "Cycle the buffer through three major modes (text, org, normal)."

  (let* ( (modes (list #'org-mode #'text-mode #'normal-mode))
              (or (cadr (member major-mode modes)) (car modes))) )
    (apply (list new-mode)) ))

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