Re: How to get DISPLAY of emacsclient?

[Jim Porter]

On 11/25/2022 7:36 PM, Max Nikulin wrote:
> On 25/11/2022 23:57, Stefan Monnier wrote:
> > - you can check the `display` parameter of the selected frame (should
> >    handle the `emacsclient --display` case).
>
>      emacsclient --display "$DISPLAY" \
>          --eval "(frame-parameter (selected-frame) 'display)"
>
> may be a workaround, thank you for the idea. A caveat is that --display 
> parameter becomes mandatory, DISPLAY environment is not enough...

Looking through the emacsclient.c code, I think this is intentional, and 
if you want to do something like this, the above workaround is exactly 
what you're supposed to do:

     If the -c option is used (without -t) and no --display argument
     is provided, try $DISPLAY.
     Without the -c option, we used to set 'display' to $DISPLAY by
     default, but this changed the default behavior and is sometimes
     inconvenient.  So we force users to use "--display $DISPLAY" if
     they want Emacs to connect to their current display.