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Re: custom-set-faces for various file types

From: Christopher Dimech
Subject: Re: custom-set-faces for various file types
Date: Sun, 22 Nov 2020 23:10:18 +0100

Could you help me redo the following using face-remap

(add-hook 'texinfo-mode-hook
      '(font-lock-variable-name-face ((t (:foreground "green"))))
      '(font-lock-builtin-face ((t (:foreground "green"))))       ))

;; ----------------------------------------------------------------------
;; Colourise Texinfo Outlines Levels (Chapters, Sections, Headlines)
       ((t (:inherit font-lock-function-name-face
            :foreground "#ffdd00"))) ))

;; ----------------------------------------------------------------------
;; Colourise Org-Mode Heading Levels
   '(org-level-1 ((t (:foreground "cyan1"))))
   '(org-level-2 ((t (:foreground "chartreuse"))))
   '(org-level-3 ((t (:foreground "dark orange"))))
   '(org-level-4 ((t (:foreground "yellow"))))
   '(org-level-5 ((t (:foreground "magenta"))))
   '(org-level-6 ((t (:foreground "tan1"))))
   '(org-level-7 ((t (:foreground "deep sky blue"))))
   '(org-level-8 ((t (:foreground "orange red"))))    )

> Sent: Sunday, November 22, 2020 at 10:39 PM
> From: "Michael Heerdegen" <>
> To:
> Subject: Re: custom-set-faces for various file types
> Christopher Dimech <> writes:
> > > What is your goal?  Faces looking differently depending on the major
> > > mode?
> >
> > I would like that some special constructs are highligthed so that the
> > contrast would be suitable for assistive reasons.  For instance, in
> > current texinfo modes, constructs in pure tex do not get highlighted.
> > So I have some code that uses custom-set-faces in texi-init.el.
> >
> > The Manual says that custom-set-variables must be only called once.
> > [...]
> I don't think custom is the right tool for your purpose.  Face
> definitions are global.  You can switch between settings ("themes"), but
> the effect is always global.
> For texinfo, maybe you could instead change the font-locking of the
> mode?  It's defined in `texinfo-font-lock-keywords'.  Maybe it's enough
> to add an entry to that list?
> Emacs also supports per-buffer modifications of faces.  The mechanism is
> called "face-remap".  You could use it in the mode's hooks to change how
> a face looks like in buffers using that mode.  `face-remap-add-relative'
> is the function to use, takes a face and a list of specs.  Using that
> would be a cleaner solution for your case I think.
> Michael.

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