Re: use SLIME/SDL2 from the VT

[2QdxY4RzWzUUiLuE]

On 2021-07-04 at 22:45:17 +0200,
Emanuel Berg via Users list for the GNU Emacs text editor 
<help-gnu-emacs@gnu.org> wrote:

> > Can you use SLIME/SDL2 from the Linux VT and pipe the
> > graphics to X, similar to what happens (sometimes) with the
> > shell tools if you set the DISPLAY=":0" environmental, or if
> > the tool comes with a -d option specifically for this (which
> > SBCL don't)?
> >
> > The below attempt doesn't work, what happens is that with or
> > without it SBCL tries and actually manages to write
> > something to the VT framebuffer, but then crashes.
> >
> > Can it be done?
> >
> > (setq slime-lisp-implementations
> >       '((sbcl ("sbcl" "--core" "/home/incal/cl/sbcl.core-with-swank")
> >               :env ("DISPLAY=\":0\"")

Try:

    :env ("DISPLAY=:0")

> >               :init (lambda (port-file _)
> >                       (format "(swank:start-server %S)\n" port-file) ))))
> 
> I works with
> 
>   $ DISPLAY=":0" emacs -nw

In the shell, those quotes are part of shell syntax, not part of the
value of the DISPLAY variable.  That command works just as well as
follows:

    $ DISPLAY=:0 emacs -nw

> Note the -nw, because without it, the whole Emacs instance
> will be the GUI version, in X.