bug#58282: Distinguishing glasses-mode display

[uzibalqa via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

------- Original Message -------
On Tuesday, October 4th, 2022 at 12:43 PM, Eli Zaretskii <eliz@gnu.org> wrote:


> > From: Christopher Dimech dimech@gmx.com
> > Cc: uzibalqa uzibalqa@proton.me, 58282@debbugs.gnu.org
> > Date: Tue, 4 Oct 2022 13:47:33 +0200
> > 
> > > I think we have this already: customize glasses-face to some distinct
> > > face, like 'bold'. Then the capital letters of identifiers where
> > > glasses.el inserted underscores will be shown in bold, and you can
> > > visually distinguish them from the original underscores.
> > 
> > Because I use bold font the default does not work for me.
> 
> 
> ??? What default? The default is that glasses-face is just nil, so no
> special face is put on any parts of the identifiers. 'bold' was just
> an example of a non-default face; you can use any face there.
> 
> > I want to make the changes in my init file. How can I change the
> > foreground and background colour of the glasses matches?
> 
> 
> You can't. This face is not about changing the matches, it is about
> changing the appearance of the capital letters in identifiers where
> glasses-mode adds the separator (which is underscore _ by default)
> 
> > Is it possible for users to use a UTF8 Code as separator, and if so,
> > how can this be done?
> 
> 
> Customize the variable glasses-separator. (This has nothing to do
> with the original bug report, though.)

How can I change the colour of the capital letters or use utf8 using
elisp commands?