tileos-settings-river/usr/share/river/scripts/brightness-notify.sh

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#!/bin/bash
VALUE=$(echo "$(brightnessctl get) * 100 / $(brightnessctl max)" | bc)
TEXT="Brightness: ${VALUE}%"
notify-send \
--expire-time 800 \
--hint string:x-canonical-private-synchronous:brightness \
--hint "int:value:$VALUE" \
--hint "int:transient:1" \
"${TEXT}"