31 lines
934 B
Bash
31 lines
934 B
Bash
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#!/usr/bin/env bash
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# Backlight control with a dunst OSD. usage: brightness up|down|set <n>
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set -uo pipefail
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STEP="${BRIGHTNESS_STEP:-5}"
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MIN=1 # never go fully dark — that looks like a crash
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ID=2594
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command -v brightnessctl >/dev/null || { echo "brightnessctl not found" >&2; exit 1; }
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pct() { brightnessctl -m | awk -F, '{gsub(/%/,"",$4); print $4}'; }
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case "${1:-}" in
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up) brightnessctl -q set "${STEP}%+" ;;
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down) brightnessctl -q set "${STEP}%-" ;;
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set) brightnessctl -q set "${2:?need a percentage}%" ;;
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""|-h|--help) echo "usage: brightness up|down|set <percent>"; exit 0 ;;
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*) echo "unknown action: $1" >&2; exit 2 ;;
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esac
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# Enforce the floor
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current="$(pct)"
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if (( current < MIN )); then
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brightnessctl -q set "${MIN}%"
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current="$MIN"
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fi
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command -v dunstify >/dev/null && \
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dunstify -a osd -u low -r "$ID" -h "int:value:$current" \
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-i display-brightness "Brightness ${current}%"
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