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Q: how can I display a marked-up string without the markup?

I have a string with LaTeX markup, such as the following name with an umlaut:

Tezc\"ur

I want to display the string in a buffer without the markup, but with the umlaut, as in:

Tezcür

How can I display the string as intended without actually modifying the string? Basically, how can I convince Emacs to display \"u as ü?

  • There's prettify-symbols-mode, but that doesn't have support for that particular markup. – rpluim Aug 6 '18 at 13:11
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It seems like you should be able to get prettify-symbols-mode to do this, but I could not figure it out.

Here is a font-lock approach with overlays. It is a little tedious since you have to define every replacement and replacement char, but this is nearly what you have to do with prettify-symbols-mode anyway.

(setq replacements '(("\\\"u" . "ü")
             ("\\\"o" . "ö")))

(defun next-symbol (&optional limit)
  (while (re-search-forward (mapconcat
                 (lambda (cc)
                   (concat "\\("
                       (regexp-quote (car cc))
                       "\\)"))
                 replacements "\\|")
                limit t)
    (let* ((pattern (match-string 0))
       (replacement (cdr (assoc pattern replacements)))
       (beg (match-beginning 0))
       (end (match-end 0))
       (ov (make-overlay beg end)))
      (overlay-put ov 'symbol-overlay t)
      (overlay-put ov 'display replacement))))


(font-lock-add-keywords
 nil
 '((next-symbol (0 nil t)))
 t)

You can clear the overlays with (ov-clear 'symbol-overlay).

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