I've been struggling with getting a wezterm window running cmus on a specific workspace upon start up for a while now. I can't use assign because the only eligible criteria differentiating it from a generic wezterm window is the pid, and my attempts to get the pid from get_tree and use that have been unsuccessful. I thought I had figured it out, when I put these lines in a another file:

#! /bin/bash
sway workspace 10 && sway 'exec wezterm -e cmus'

then in my config file I have this: exec ./start_cmus.sh

But it doesn't work. If I run start_cmus from the shell, the expected behavior ensues (a wezterm window running cmus is opened on workspace 10).

Any tips?