.bashrc to show battery percentage at prompt

Code:
#

# ~/.bashrc

#



# If not running interactively, don't do anything

[[ $- != *i* ]] && return



alias ls='ls --color=auto'



battery_status(){

  # From http://www.basicallytech.com/blog/archive/110/Colour-coded-battery-charge-level-and-status-in-your-bash-prompt

  BATTERY=/sys/class/power_supply/axp20x-battery



  BATSTATE=$(cat ${BATTERY}/status)

  CHARGE=$(cat ${BATTERY}/capacity)



  NON='\033[00m'

  BLD='\033[01m'

  RED='\033[01;31m'

  GRN='\033[01;32m'

  YEL='\033[01;33m'



  COLOUR="$RED"



  case "${BATSTATE}" in

     'Charged')

     BATSTT="$BLD=$NON"

     ;;

     'Charging')

     BATSTT="$BLD+$NON"

     ;;

     'Discharging')

     BATSTT="$BLD-$NON"

     ;;

  esac



  # prevent a charge of more than 100% displaying

  if [ "$CHARGE" -gt "99" ]

  then

     CHARGE=100

  fi

  

  if [ "$CHARGE" -gt "15" ]

  then

     COLOUR="$YEL"

  fi

  

  if [ "$CHARGE" -gt "30" ]

  then

     COLOUR="$GRN"

  fi

  

  echo -e "${COLOUR}${CHARGE}%${NON} ${BATSTT}"

}





PS1='[$(battery_status)][\u@\h \W]\$ '