#!/bin/sh
# FreeBSD version

print_usage () {
  echo >&2 "usage: $(basename ${0}) [0..100]"
  exit 1
}

# check if argument given or not (list or set value)
if [ $# -eq 1 ]
then
  # set value (select between ac or bat mode)
  # check if argument is integer between 0,100
  if [ "$1" -eq "$1" ] 2>/dev/null
  then
    if [ "$1" -ge 0 ] && [ "$1" -le 100 ] 2>/dev/null
    then
      # argument given and between 0,100
      case $( sysctl -n hw.acpi.acline ) in

        (0) # BATTERY
          echo "$1" > ${HOME}/.backlight-bat
          ;;

        (1) # AC
          echo "$1" > ${HOME}/.backlight-ac
          ;;

      esac
      backlight "$1"
    else
      # arg not between 0 and 100
      print_usage
    fi
  else
    # arg not an integer
    print_usage
  fi
else
  # no args given, only list values
  case $( sysctl -n hw.acpi.acline ) in
    (0) # BATTERY
      current=bat
      ;;
    (1) # AC
      current=ac
      ;;
  esac

  for status in ac bat
  do
    if [ "${status}" = "${current}" ]
    then
      echo -e "${status}: ★ \t$( cat ${HOME}/.backlight-${status} )" | tr "[:lower:]" "[:upper:]"
    else
      echo -e "${status}:\t$( cat ${HOME}/.backlight-${status} )" | tr "[:lower:]" "[:upper:]"
    fi
  done
  echo -e "CUR:\t$(backlight | awk '{ print $2 }')"
fi