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#!/usr/bin/env bash
# --- CONFIGURATION ---
DISPLAY_NUM=1
STEP=5
STATE_FILE="/tmp/waybar_brightness.tmp"
# ---------------------
# Function to send the actual DDC/CI command in the background
set_brightness_in_background() {
pkill -f "ddcutil.*setvcp 10"
(ddcutil --display $DISPLAY_NUM setvcp 10 $1) &
}
# Ensure state file exists, or create it by querying the monitor
if [ ! -f "$STATE_FILE" ]; then
# ddcutil terse output format: "VCP 10 C <current> <max>"
initial_brightness=$(ddcutil --display $DISPLAY_NUM getvcp 10 -t 2>/dev/null | awk '{print $4}')
# Fallback to 50 if ddcutil fails or returns non-numeric
if ! [[ "$initial_brightness" =~ ^[0-9]+$ ]]; then
initial_brightness=50
fi
echo "$initial_brightness" >"$STATE_FILE"
fi
current=$(cat "$STATE_FILE")
# Validate current is a number, fallback to 50 if corrupted
if ! [[ "$current" =~ ^[0-9]+$ ]]; then
current=50
echo "$current" >"$STATE_FILE"
fi
case "$1" in
"get")
echo "$current"
;;
"up")
new_brightness=$((current + STEP > 100 ? 100 : current + STEP))
if [ "$current" -ne "$new_brightness" ]; then
echo "$new_brightness" >"$STATE_FILE"
set_brightness_in_background "$new_brightness"
fi
pkill -RTMIN+9 waybar # Can add whatever RTMIN+n you please, as long as it's an integer. Make sure the signals match between the config and script.
;;
"down")
new_brightness=$((current - STEP < 0 ? 0 : current - STEP))
if [ "$current" -ne "$new_brightness" ]; then
echo "$new_brightness" >"$STATE_FILE"
set_brightness_in_background "$new_brightness"
fi
pkill -RTMIN+9 waybar
;;
"right_click")
new_brightness=0
if [ "$current" -ne "$new_brightness" ]; then
echo "$new_brightness" >"$STATE_FILE"
set_brightness_in_background "$new_brightness"
fi
pkill -RTMIN+9 waybar
;;
"left_click")
new_brightness=100
if [ "$current" -ne "$new_brightness" ]; then
echo "$new_brightness" >"$STATE_FILE"
set_brightness_in_background "$new_brightness"
fi
pkill -RTMIN+9 waybar
;;
esac
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