Re: How to get DISPLAY of emacsclient?

[Jim Porter <jporterbugs@gmail.com>]

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.