Re: prettify-symbols-mode to handle "\alpha-\beta" ...

[pietru@caramail.com]

> Sent: Thursday, February 04, 2021 at 2:08 PM
> From: "Óscar Fuentes" <ofv@wanadoo.es>
> To: emacs-devel@gnu.org
> Subject: Re: prettify-symbols-mode to handle "\alpha-\beta" ...
>
> pietru@caramail.com writes:
> 
> > I am using prettify-symbols-mode for displaying greek command using
> > the corresponding greek glyph when using mathematical expressions
> > in texinfo.
> >
> > Here is an example
> >
> >   (push '("\\alpha" . ?α) prettify-symbols-alist)
> >   (push '("\\beta" . ?β) prettify-symbols-alist)
> >
> > This works well when using "\alpha\beta", "\alpha - \beta" 
> > But the expression fails when using "\alpha-\beta" or
> > "\alpha_i", "\alpha_{ij}", "\beta^i", "\beta+\alpha".
> > The expressions are all valid mathematical expressions
> > when using tex.  
> >
> > Would you be so kind to update "prettify-symbols-mode"
> > so the substitutions can become possible to handle.
> >
> > Does this require that SYMBOL in (SYMBOL . CHARACTER) be
> > a regexp?
> 
> The docstring of prettify-symbols-alist says:
> 
>   Each element looks like (SYMBOL . CHARACTER), where the symbol
>   matching SYMBOL (a string, not a regexp) will be shown as CHARACTER
>   instead.
> 
> so no, SYMBOL *must* *not* be a regexp.
> 
> I can't reproduce the problem you are describing. After starting Emacs:
> 
> emacs -Q
> 
> if I evaluate this in *scratch*:
> 
>   (push '("\\alpha" . ?α) prettify-symbols-alist)
> 
> then open a .tex file, write \alpha_i, M-x prettify-symbols-alist, the
> string is transformed to α_i.
> 
> Please note that the definition of SYMBOL depends on the major mode of
> the buffer, so make sure that your current major mode is tex-mode.
> 

No, the major mode is texinfo-mode.  Texinfo allows mathematics to be
displayed using the usual tex expressions.  Could this functionality
be put for use in texinfo-mode?

 
>