oh-my-bash/plugins/battery/battery.plugin.sh

#!/usr/bin/env bash

ac_adapter_connected(){
  if _command_exists upower;
  then
    upower -i $(upower -e | grep BAT) | grep 'state' | grep -q 'charging\|fully-charged'
    return $?
  elif _command_exists acpi;
  then
    acpi -a | grep -q "on-line"
    return $?
  elif _command_exists pmset;
  then
    pmset -g batt | grep -q 'AC Power'
    return $?
  elif _command_exists ioreg;
  then
    ioreg -n AppleSmartBattery -r | grep -q '"ExternalConnected" = Yes'
    return $?
  elif _command_exists WMIC;
  then
    WMIC Path Win32_Battery Get BatteryStatus /Format:List | grep -q 'BatteryStatus=2'
    return $?
  fi
}

ac_adapter_disconnected(){
  if _command_exists upower;
  then
    upower -i $(upower -e | grep BAT) | grep 'state' | grep -q 'discharging'
    return $?
  elif _command_exists acpi;
  then
    acpi -a | grep -q "off-line"
    return $?
  elif _command_exists pmset;
  then
    pmset -g batt | grep -q 'Battery Power'
    return $?
  elif _command_exists ioreg;
  then
    ioreg -n AppleSmartBattery -r | grep -q '"ExternalConnected" = No'
    return $?
  elif _command_exists WMIC;
  then
    WMIC Path Win32_Battery Get BatteryStatus /Format:List | grep -q 'BatteryStatus=1'
    return $?
  fi
}

battery_percentage(){
  about 'displays battery charge as a percentage of full (100%)'
  group 'battery'

  if _command_exists upower;
  then
    local UPOWER_OUTPUT=$(upower --show-info $(upower --enumerate | grep BAT) | grep percentage | tail --bytes 5)
    echo ${UPOWER_OUTPUT: : -1}
  elif _command_exists acpi;
  then
    local ACPI_OUTPUT=$(acpi -b)
    case $ACPI_OUTPUT in
      *" Unknown"*)
        local PERC_OUTPUT=$(echo $ACPI_OUTPUT | head -c 22 | tail -c 2)
        case $PERC_OUTPUT in
          *%)
            echo "0${PERC_OUTPUT}" | head -c 2
          ;;
          *)
            echo ${PERC_OUTPUT}
          ;;
        esac
      ;;

      *" Charging"* | *" Discharging"*)
        local PERC_OUTPUT=$(echo $ACPI_OUTPUT | awk -F, '/,/{gsub(/ /, "", $0); gsub(/%/,"", $0); print $2}' )
        echo ${PERC_OUTPUT}
      ;;
      *" Full"*)
        echo '100'
      ;;
      *)
        echo '-1'
      ;;
    esac
  elif _command_exists pmset;
  then
    local PMSET_OUTPUT=$(pmset -g ps | sed -n 's/.*[[:blank:]]+*\(.*%\).*/\1/p')
    case $PMSET_OUTPUT in
      100*)
        echo '100'
      ;;
      *)
        echo $PMSET_OUTPUT | head -c 2
      ;;
    esac
  elif _command_exists ioreg;
  then
    local IOREG_OUTPUT=$(ioreg -n AppleSmartBattery -r | awk '$1~/Capacity/{c[$1]=$3} END{OFMT="%05.2f%%"; max=c["\"MaxCapacity\""]; print (max>0? 100*c["\"CurrentCapacity\""]/max: "?")}')
    case $IOREG_OUTPUT in
      100*)
        echo '100'
      ;;
      *)
        echo $IOREG_OUTPUT | head -c 2
      ;;
    esac
  elif _command_exists WMIC;
  then
    local WINPC=$(echo porcent=$(WMIC PATH Win32_Battery Get EstimatedChargeRemaining /Format:List) | grep -o '[0-9]*')
    case $WINPC in
      100*)
        echo '100'
      ;;
      *)
        echo $WINPC
      ;;
    esac
  else
    echo "no"
  fi
}

battery_charge(){
  about 'graphical display of your battery charge'
  group 'battery'

  # Full char
  local F_C='▸'
  # Depleted char
  local D_C='▹'
  local DEPLETED_COLOR="${normal}"
  local FULL_COLOR="${green}"
  local HALF_COLOR="${yellow}"
  local DANGER_COLOR="${red}"
  local BATTERY_OUTPUT="${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${D_C}"
  local BATTERY_PERC=$(battery_percentage)

  case $BATTERY_PERC in
    no)
      echo ""
    ;;
    9*)
      echo "${FULL_COLOR}${F_C}${F_C}${F_C}${F_C}${F_C}${normal}"
    ;;
    8*)
      echo "${FULL_COLOR}${F_C}${F_C}${F_C}${F_C}${HALF_COLOR}${F_C}${normal}"
    ;;
    7*)
      echo "${FULL_COLOR}${F_C}${F_C}${F_C}${F_C}${DEPLETED_COLOR}${D_C}${normal}"
    ;;
    6*)
      echo "${FULL_COLOR}${F_C}${F_C}${F_C}${HALF_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${normal}"
    ;;
    5*)
      echo "${FULL_COLOR}${F_C}${F_C}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${normal}"
    ;;
    4*)
      echo "${FULL_COLOR}${F_C}${F_C}${HALF_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${normal}"
    ;;
    3*)
      echo "${FULL_COLOR}${F_C}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${normal}"
    ;;
    2*)
      echo "${FULL_COLOR}${F_C}${HALF_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${normal}"
    ;;
    1*)
      echo "${FULL_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    05)
      echo "${DANGER_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    04)
      echo "${DANGER_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    03)
      echo "${DANGER_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    02)
      echo "${DANGER_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    0*)
      echo "${HALF_COLOR}${F_C}${DEPLETED_COLOR}${D_C}${D_C}${D_C}${D_C}${normal}"
    ;;
    *)
      echo "${DANGER_COLOR}UNPLG${normal}"
    ;;
  esac
}