Trigger on display change?

[xabbu]

Hi - is it possible to get a workflow triggered by a change of displays?

I would like to change the sound output device when I connect my external monitor automatically - I have seen the workflow 'alfred change sound output' (http://www.packal.org/workflow/alfred-change-sound-output) and it would be nice to make this switch to happen automatically when attaching/detaching the external monitor.

Thanks,

Axel

[deanishe]

Not with Alfred alone, no. Alfred responds only to user input/actions.

 

You could use Keyboard Maestro to call a workflow. KM can also trigger actions based on other kinds of events, such as attached/detached hardware.

 

I think it might also be possible using a Launch Agent, which is built into macOS.

[xabbu]

Thanks - I see.

I noticed that I can get the event in hammerspoon (http://www.hammerspoon.org/) which I am using (via hs.screen.watcher) but had hoped it would be easier in Alfred.

So I have to find a way, either to bridge from the hammerspoon event to alfred, or actually make the whole thing in hammerspoon (which should be possible through the hs.audiodevice module. I guess in the end it might be easier to do it here.

Thanks in any case!
Axel

[deanishe]

The workflow you referenced uses switchaudio-osx to do the actual work.

 

You could probably call that quite easily from Hammerspoon instead.

Edited June 29, 2017 by deanishe

[xabbu]

You are correct, of course - good idea! Thanks!

[xabbu]

In the end I am using the calls in Hammerspoon hs.audiodevice module directly - which seems to work nicely now. In case anybody would be interested, let me know.

Thanks and regards,

Axel