#! /usr/bin/zsh

battery_level()
{
  # Return a "battery level" gauge ready to be used in prompt.
  
  local online remaining bstatus gauge gcolor

  online=0
  acpi -a 2> /dev/null | grep -q "on-line" && online=1

  bstatus="$(acpi -b 2> /dev/null)"
  remaining="$(echo ${bstatus[(w)4]} | sed -r 's/(^[0-9]+)%.*/\1/')"

  if [[ -z "$remaining" ]]; then
    return
  elif [[ "$remaining" -gt "95" && "$online" -eq "1" ]]; then
    return
  elif [[ "$remaining" -lt "10" ]]; then
    echo "${C_RED}►${C_NO}"
    return
  fi

  gauge=""
  rgauge=""
  gcolor=${C_BGREEN}

  for i in $(seq ${remaining[1]}); do
    gauge="${gauge}►"
  done
  for i in $(seq $(( 10 - ${remaining[1]})) ); do
    rgauge="${rgauge}·"
  done

  if [[ "${#gauge}" -lt "3" ]]; then
    gcolor=${C_BRED}
  elif [[ "${#gauge}" -lt "6" ]]; then
    gcolor=${C_BYELLOW}
  fi

  echo "${gcolor}${gauge}${C_NO}${C_WHITE}${rgauge}${C_NO}"
}