elisp - How to make a long word get displayed as a shorter word in an emacs buffer? -

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i reading source of rainbow-delimiters.el , trying replace word rainbow-delimiters rd using code got somewhere replaces word lambda greek letter.

this code came , doesn't want.

(defun my-simplify-prefix (prefix)   ;; (interactive "sprefix: ")   (interactive (list "rainbow-delimiters"))   (font-lock-add-keywords    nil `((,(rx-to-string `(group ,prefix))           (0 (progn (compose-region (match-beginning 1) (match-end 1)                                     "rd")                     nil)))))   (font-lock-fontify-buffer))

what instead replaces rainbow-delimiters 1 letter combination of r , d.

(defun my-simplify-prefix (prefix)   (interactive "sprefix: ")   (font-lock-add-keywords    nil `((,(rx-to-string `(group ,prefix))            (0 (progn (put-text-property (match-beginning 1) (match-end 1)                                         'display "rd")                      nil)))))   (font-lock-fontify-buffer))

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