#!/bin/sh
# Turn every output off, or back on. Installed to /usr/local/bin/display-toggle and
# bound to the remote's power/sleep buttons in the Sway config.
#
# WHY THE POWER BUTTON DOES NOT POWER ANYTHING OFF: on a TV, that button turns the
# picture off. On a thin client that autologins into a kiosk, `poweroff` takes the
# room's screen away until somebody walks over and presses a physical button — which
# is a worse outcome than any it prevents. So the remote's power button does the thing
# the person pressing it actually meant.
#
# THE WAKE SIDE IS THE HARD HALF. With outputs powered off, Sway is still running and
# still receiving keys, so pressing power again lands here and turns them back on.
# That is why this is a toggle rather than two bindings: there is no other way back.
# It also means a *stuck* remote button cannot leave the screen dark — the next press
# fixes it.
set -eu

# `swaymsg -t get_outputs` reports each output's dpms state. If ANY output is still on,
# the intent of a press is "turn it off"; only when everything is already dark does a
# press mean "wake up". That ordering matters on a multi-output machine, where asking
# per-output would leave the remote toggling one screen at a time.
if swaymsg -t get_outputs | grep -q '"dpms": true'; then
  swaymsg 'output * dpms off'
else
  swaymsg 'output * dpms on'
fi