#!/bin/sh

# Set brightness for laptops backlight

PATH="$HOME/.local/bin:$PATH"

# brightness values
night=1000
transition=1500
daytime=2000

deref() {
  eval "echo \$$1"
}

fade_to() {
  current=$(brightness)
  echo $current $1
  step=10
  [ "$current" -gt "$1" ] && sign=- || sign=+
  for i in $(seq "$current" "${sign}$step" "$1"); do
    brightness "$sign" "$step" > /dev/null
    sleep 1
  done
}


if [ "$1" = "period-changed" ]; then
  fade_to "$(deref "$3")"
fi