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#!/usr/bin/env bash
# Glowing animation for DCHU keyboard backlight LED
# Default LED: /sys/class/leds/dchu::kbd_backlight (max_brightness=5)
set -euo pipefail
LED_DEFAULT="/sys/class/leds/dchu::kbd_backlight"
LED_PATH="${LED_DEFAULT}"
DELAY="0.08" # seconds between steps
CYCLES="-1" # -1 = infinite, otherwise number of up+down cycles
MAX_OVERRIDE="" # override max_brightness
usage() {
cat <<EOF
Usage: $(basename "$0") [-d LED_PATH] [-s STEP_DELAY] [-c CYCLES] [-m MAX]
-d LED_PATH LED sysfs path (default: ${LED_DEFAULT})
-s DELAY Step delay in seconds (default: ${DELAY})
-c CYCLES Number of glow cycles; -1 = infinite (default: ${CYCLES})
-m MAX Override max_brightness (default: read from sysfs)
Examples:
sudo $(basename "$0")
sudo $(basename "$0") -s 0.05 -c 20
sudo $(basename "$0") -m 5
EOF
}
while getopts ":d:s:c:m:h" opt; do
case "$opt" in
d) LED_PATH="$OPTARG" ;;
s) DELAY="$OPTARG" ;;
c) CYCLES="$OPTARG" ;;
m) MAX_OVERRIDE="$OPTARG" ;;
h) usage; exit 0 ;;
:) echo "Missing value for -$OPTARG" >&2; usage; exit 2 ;;
\?) echo "Unknown option: -$OPTARG" >&2; usage; exit 2 ;;
esac
done
# Auto-detect LED if default not present
if [ ! -d "$LED_PATH" ]; then
cand=$(ls -d /sys/class/leds/dchu::* 2>/dev/null | head -n1 || true)
if [ -n "$cand" ]; then
LED_PATH="$cand"
fi
fi
if [ ! -d "$LED_PATH" ]; then
echo "LED path not found: $LED_PATH" >&2
exit 1
fi
BR="$LED_PATH/brightness"
MB="$LED_PATH/max_brightness"
if [ ! -f "$BR" ]; then
echo "Missing brightness file: $BR" >&2
exit 1
fi
if [ -n "$MAX_OVERRIDE" ]; then
MAX="$MAX_OVERRIDE"
else
if [ -f "$MB" ]; then
MAX=$(cat "$MB")
else
MAX=5
fi
fi
# Sanitize numeric inputs
if ! [[ "$MAX" =~ ^[0-9]+$ ]] || [ "$MAX" -lt 1 ]; then
echo "Invalid max brightness: $MAX" >&2
exit 2
fi
if ! [[ "$CYCLES" =~ ^-?[0-9]+$ ]]; then
echo "Invalid cycles count: $CYCLES" >&2
exit 2
fi
write_brightness() {
local v="$1"
# Try direct write; if it fails, attempt sudo tee
if ! echo "$v" > "$BR" 2>/dev/null; then
echo "$v" | sudo tee "$BR" >/dev/null
fi
}
ORIG=$(cat "$BR" 2>/dev/null || echo 0)
cleanup() {
write_brightness "$ORIG" || true
}
trap cleanup EXIT INT TERM
# Main loop: ramp 0..MAX..0
cycle=0
while :; do
# Up
for ((i=0; i<=MAX; i++)); do
write_brightness "$i"
sleep "$DELAY"
done
# Down (avoid repeating endpoints too long)
for ((i=MAX-1; i>=1; i--)); do
write_brightness "$i"
sleep "$DELAY"
done
if [ "$CYCLES" -ge 0 ]; then
cycle=$((cycle+1))
if [ "$cycle" -ge "$CYCLES" ]; then
break
fi
fi
done
exit 0
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