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#!/usr/bin/env bash
# ==================================================
# KoolDots (2026)
# Project URL: https://github.com/LinuxBeginnings
# License: GNU GPLv3
# SPDX-License-Identifier: GPL-3.0-or-later
# ==================================================
# External monitor brightness via ddcutil
set -u
step=10
vcp_code=10
usage() {
cat <<'EOF'
Usage: ExternalBrightness.sh [--get|--inc|--dec|--set N] [--display N]
Env:
DDCUTIL_DISPLAY Optional display number passed to ddcutil --display
DDCUTIL_OPTS Extra options passed to ddcutil (e.g. "--sleep-multiplier 0.2")
EOF
}
ddcutil_cmd() {
local display_arg=()
local display="${DDCUTIL_DISPLAY:-}"
if [[ -n "${display}" ]]; then
display_arg+=(--display "${display}")
fi
ddcutil ${DDCUTIL_OPTS:-} "${display_arg[@]}" "$@"
}
get_brightness() {
# Example output: "VCP code 0x10 (Brightness): current value = 50, max value = 100"
local line
if ! line="$(ddcutil_cmd getvcp "${vcp_code}" 2>/dev/null | tail -n 1)"; then
return 1
fi
local current max
current="$(printf "%s" "${line}" | sed -n 's/.*current value = \([0-9]\+\).*/\1/p')"
max="$(printf "%s" "${line}" | sed -n 's/.*max value = \([0-9]\+\).*/\1/p')"
[[ -n "${current}" && -n "${max}" ]] || return 1
printf "%s %s\n" "${current}" "${max}"
}
set_brightness() {
local value="$1"
ddcutil_cmd setvcp "${vcp_code}" "${value}" >/dev/null 2>&1
}
json_output() {
local current max percent icon
if ! read -r current max < <(get_brightness); then
printf '{"text":" N/A","tooltip":"External brightness unavailable (load i2c-dev, allow i2c access)","class":"brightness-external-off"}\n'
return 0
fi
percent=$(( current * 100 / max ))
if (( percent >= 80 )); then
icon=""
elif (( percent >= 60 )); then
icon=""
elif (( percent >= 40 )); then
icon=""
elif (( percent >= 20 )); then
icon=""
else
icon=""
fi
printf '{"text":"%s %s%%","tooltip":"External display brightness: %s%%","class":"brightness-external"}\n' "${icon}" "${percent}" "${percent}"
}
case "${1:-}" in
--get|"")
json_output
;;
--inc|--dec)
read -r current max < <(get_brightness) || exit 1
delta=$step
[[ "$1" == "--dec" ]] && delta=$(( -step ))
new=$(( current + delta ))
(( new < 5 )) && new=5
(( new > max )) && new="${max}"
set_brightness "${new}"
json_output
;;
--set)
[[ -n "${2:-}" ]] || { usage; exit 1; }
set_brightness "${2}"
json_output
;;
--display)
[[ -n "${2:-}" ]] || { usage; exit 1; }
DDCUTIL_DISPLAY="${2}" shift 2
"${0}" "${@:-"--get"}"
;;
-h|--help)
usage
;;
*)
usage
exit 1
;;
esac
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