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Re: Trojan Source detection/highlight in Emacs?

From: Eli Zaretskii
Subject: Re: Trojan Source detection/highlight in Emacs?
Date: Wed, 03 Nov 2021 15:03:18 +0200

> From: Anders Munch <>
> Date: Wed, 3 Nov 2021 08:52:52 +0000
> Accept-Language: en-US
> Eli Zaretskii wrote:
> > Stefan Monnier wrote: 
> >> A simple and straightforward way to do that is to highlight any 
> >> non-ASCII char, and to render all the "non printing" chars (such as 
> >> RIGHT-TO-LEFT OVERRIDE) as tofu or something like that (otherwise, the 
> >> highlighting applied to it wouldn't be visible).
> >
> > That's already available, no changes needed.
> Can we get a recipe, please?

Customize the variable glyphless-char-display-control.

> I tried customising bidi-paragraph-direction, setting it to 'left-to-right, 
> but I'm not seeing any effect, despite the docstring saying it /forces/ 
> directionality.

The doc string says it forces the directionality of the paragraph.  If
you don't already know what that means, I suggest to read the
"Bidirectional Editing" node in the Emacs manual, it should explain

> I guess it just sets a default, and explicit bidi control characters take 
> precedence.

Not exactly, but something like that.

The paragraph direction is not relevant to this issue, since in
prog-mode descendants we already set the value to left-to-right.

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