#!/bin/sh
# this script is based on some assumptions that are made in the context
# of my gentoo/swaywm setup

set -e
[ -n "$DEBUG" ] && set -x

usage() {
	printf "usage: %s USER [ARGS...]" "$(basename "$0")\n"
	printf "\n"
	printf "enter the desktop session of USER and run COMMAND.\n"
	exit 1
}

case "$1" in
-h)	usage && exit 0 ;;
esac

user="${1}"
[ -z "${user}" ] && usage
shift

uid=$(id -u "${user}")

marker_bins="
	oguri
	kanshi
	waybar
	gammastep
	pipewire
	swayidle
"
pid=
for bin in ${marker_bins}; do
	pid=$(cat "/run/user/"${uid}"/"${bin}".pid")
	kill -0 "${pid}" && break
done

env=$(grep -zE '^(SWAY|I3|WAYLAND|DBUS|XDG|PATH)' /proc/"${pid}"/environ | tr '\0' ' ' || true)
exec doas -u "${user}" env ${env} "${@}"