i3_Battery_Notif.sh

#!/bin/bash

    # crontab -e :
    # @reboot nohup /home/ryahiaoui/.config/i3/i3_Battery_Notif.sh &
    
    _alarm() {
        ( \speaker-test --frequency $1 --test sine )&
        pid=$!
        \sleep 0.${2}s
        \kill -9 $pid
    }

    _beep() {
     _alarm 700 100
     _alarm 800 100
    }
    
    _beep_1() {
     play -q -n synth 0.5 sin 400 || echo -e "\a"
    }
    
    show_popup() {
        WISH_SCRIPT="wm state . withdrawn; tk_messageBox -icon warning -title \"Battery Warning\" -message \"${1}\"; exit"
        echo "$WISH_SCRIPT" | wish
    }

    show_nagbar(){
        i3-msg "exec i3-nagbar -m \"${1}\""
    }

    show_notify(){
    
        GNOME_ICON="/usr/share/icons/gnome/scalable/status/battery-low-symbolic.svg"
        XFCE_ICON="/usr/share/icons/elementary-xfce/status/48/battery-low.png"
        
        # try to find nice notify icon
        if [[ -z $NOTIFY_ICON ]]; then
            if [[ -f $GNOME_ICON ]]; then
                NOTIFY_ICON="${GNOME_ICON}"
            elif [[ -f $XFCE_ICON ]]; then
                NOTIFY_ICON="${XFCE_ICON}"
            fi
        fi
        [[ -n $NOTIFY_ICON ]] && NOTIFY_OPT="-i ${NOTIFY_ICON}"
        notify-send -u "${2}" ${NOTIFY_OPT} "${1}"
    }

    show_message(){
        if [[ -n $USE_NOTIFY_SEND ]] && which notify-send; then
            show_notify "$1" "$2"
        elif [[ -z $DONT_USE_WISH ]] && which wish; then
            show_popup "$1" 
        else
            show_nagbar "$1"
        fi
    } >&2


    USE_NOTIFY_SEND="y"
    FULL_BATTERY="N"
    
    while true
    do
        export DISPLAY=:0.0
        export DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$(pidof i3)/environ | tr '\0' '\n' | cut -d= -f2-)
        
        battery1_level=`acpi -b | grep -P -o -m 1 '[0-9]+(?=%)'`
        battery2_level=`acpi -b | grep -P -o  '[0-9]+(?=%)' | sed -n 2p`
        #battery_level_added=$(( battery1_level + battery2_level ))
        #battery_level=$(( battery_level_added / 2 ))
        ac_power=`acpi -a | grep -P -o  '(on|off)'` 

        if [ "$ac_power" = "on" ]; then
            if [ $battery1_level -ge 100 ]; then
                #notify-send -t 20000 "Battery charging above 90%. Unplug your AC adapter!" "Charging: ${battery_level}% "
                if [ "$FULL_BATTERY" = "N" ]; then
                  show_message " $( echo -e "Battery charging above 100%.\n Unplug your AC adapter.\n ( -- Charging : ${battery1_level}% ! -- ) " ) " "low"
                  FULL_BATTERY="Y"
                fi
            fi
        else  #if discharging battery
        
            if [ $battery1_level -le 40 ]; then
                # notify-send -t 30000 "Battery is lower than %. Connect your AC adapter." "Charging: ${battery_level}%" 
                show_message " $( echo -e "Battery is lower than 40%.\n Connect your AC adapter.\n ( -- Charging  : ${battery1_level}% ! -- ) ")" "critical"
                FULL_BATTERY="N"                
                _beep_1                
                if [ $battery1_level -le 15 ]; then
                   _beep
                fi                
                
            fi
        fi

        sleep 30 # run once every  30 Ssecondes
    done