Re: Changing font weight with buffer-face-mode-invoke

[Heime <heimeborgia@protonmail.com>]

On Thursday, June 27th, 2024 at 5:23 AM, Eli Zaretskii <eliz@gnu.org> wrote:

> > Date: Wed, 26 Jun 2024 20:54:53 +0000
> > From: Heime heimeborgia@protonmail.com
> > Cc: help-gnu-emacs@gnu.org
> > 
> > Could there be support functions (font-height-list :family family) and
> > (font-weight-list :family family) so they can be used with
> > 
> > (buffer-face-mode-invoke
> > `(:family ,face-family :height ,face-height :weight ,face-weight) t)
> 
> 
> They were never needed, and I don't really understand why you'd need
> them. So no, such functions are not planned.
> 
> > As the height and weight are customarily asked by users wanting to change
> > font.
> 
> 
> Users are not asked about these attributes, certainly not
> "customarily", not in Emacs. In fact, users are not supposed to be
> bothered by that at all, they just need to specify the family/families
> of font(s) they want to use, and Emacs will do the rest automatically.

Customarily I want to set the height for good visibility which is larger
than default.  And bold in some cases.
 
> IOW, I think you are talking about a problem that doesn't exist for
> most Emacs users. I understand that you decided for some reason to
> write some peculiar program that allows selection of these attributes
> interactively, and I'm prepared to help you find the related Emacs
> functionalities for that program. 

> But the problem you are trying to solve is largely an academic one, 
> because the resulting font will be largely not useful in Emacs, as 
> you will discover next. 

Not useful for the reason that it will not activate.  Or because the font 
characteristics are not useful ?

> Emacs was not designed to support selection of fonts by fine-tuning their 
> weight, slant, and other similar attributes, so specifying such fonts works
> in some cases but doesn't work in others.

If you do S-<down-mouse-1> to use "Change Buffer Font", one can select those attributes.
I just want to do the same automatically in elisp code.