Re: sub and superscripts: without «_» and «^»

[Tassilo Horn <tsdh@gnu.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> I asked this on auctex-dev but it might be question concerning core
>> functionality of GNU emacs:
>
> The necessary core functionality has been present for a long time:
> just add the proper `invisible' property to the chars you don't want
> to see.

I guess what Uwe wants is that `prettify-symbols-mode' in a (La)TeX
buffer (with stock latex-mode or AUCTeX; doesn't really matter) could
have the option to make the ^ and _ invisible, too.

I already told him that this is not what p-s-m is meant for.  But it's
easy enough to write a custom font-lock rule for that:

--8<---------------cut here---------------start------------->8---
(defun th/invisible-super-sub-scripts ()
  (interactive)
  (cl-pushnew 'invisible font-lock-extra-managed-props)
  (font-lock-add-keywords
   nil
   '(("[^\\\\]\\([_^]\\)" (1 '(face nil invisible t) t))))
  (font-lock-flush))
--8<---------------cut here---------------end--------------->8---

Uwe, if you want you could do something like that:

--8<---------------cut here---------------start------------->8---
(add-hook 'prettify-symbols-mode-hook
	  (lambda ()
	    (when (eq major-mode 'latex-mode)
	      (th/invisible-super-sub-scripts))))
--8<---------------cut here---------------end--------------->8---

Bye,
Tassilo