27 lines
1.3 KiB
Bash
27 lines
1.3 KiB
Bash
#!/bin/sh
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# Turn every output off, or back on. Installed to /usr/local/bin/display-toggle and
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# bound to the remote's power/sleep buttons in the Sway config.
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#
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# WHY THE POWER BUTTON DOES NOT POWER ANYTHING OFF: on a TV, that button turns the
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# picture off. On a thin client that autologins into a kiosk, `poweroff` takes the
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# room's screen away until somebody walks over and presses a physical button — which
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# is a worse outcome than any it prevents. So the remote's power button does the thing
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# the person pressing it actually meant.
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#
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# THE WAKE SIDE IS THE HARD HALF. With outputs powered off, Sway is still running and
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# still receiving keys, so pressing power again lands here and turns them back on.
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# That is why this is a toggle rather than two bindings: there is no other way back.
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# It also means a *stuck* remote button cannot leave the screen dark — the next press
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# fixes it.
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set -eu
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# `swaymsg -t get_outputs` reports each output's dpms state. If ANY output is still on,
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# the intent of a press is "turn it off"; only when everything is already dark does a
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# press mean "wake up". That ordering matters on a multi-output machine, where asking
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# per-output would leave the remote toggling one screen at a time.
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if swaymsg -t get_outputs | grep -q '"dpms": true'; then
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swaymsg 'output * dpms off'
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else
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swaymsg 'output * dpms on'
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fi
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