batlevel

#! /bin/bash

# If any batteries exist, enter loop
if compgen -G "/sys/class/power_supply/BAT*" > /dev/null; then
  if ! [[ $1 == 'CLEAN' ]]; then
    # Check if battery is on AC or not, then print a cute little power indicator
    if [[ $(cat "/sys/class/power_supply/A"[CD]*"/online") -ge '1' ]]; then
      printf '\xf0\x9f\x94\x8c'
    else
      printf '\xe2\x9a\xa1'
    fi
  fi

  # Iterate over all of the batteries
  for battery_path in "/sys/class/power_supply/BAT"*; do
    # If this isn't the first run, add a separator
    if [[ -v "${battery_index}" ]]; then
      printf ', '
    fi

    # Get battery information
    battery_index=$(basename "${battery_path}"|sed 's/^BAT//')
    battery_level=$(cat "${battery_path}/capacity")

    # Start printing information
    if ! [[ $1 == 'CLEAN' ]]; then
      printf ' %s%%' "${battery_level}"
    else
      printf '%s' "${battery_level}"
    fi
  done
fi