#!/bin/bash
# Functions needed for dwm statusbar

wlan_bar(){
    # Measure signal strength in percent
    sig_strength=$(cat /sys/class/net/wlan0/wireless/link)
    # Calculate signal strength from 1-5
    bar_value=$(( $sig_strength / 20 ))

    case $bar_value in
        0)
            echo -e "\x04[|\x01||||\x04]" ;;
        1)
            echo -e "\x04[||\x01|||\x04]" ;;
        2)
            echo -e "\x04[|||\x01||\x04]" ;;
        3)
            echo -e "\x04[||||\x01|\x04]" ;;
        4)
            echo -e "\x04[|||||]" ;;
        5)
            echo -e "\x04[|||||]" ;;
    esac
}
battery_status(){
    #raw_status=$(acpi -b | awk 'sub(/,/,"") {print $3, $4}')
    # Check if battery is charging or discharging
    charge_stat(){
        if [ -e /sys/class/power_supply/BAT0/status ]
        then
            case $(cat /sys/class/power_supply/BAT0/status) in
                Charging)
                    charge_status="+"
                    ;;
                Discharging)
                    charge_status="-"
                    ;;
            esac
        fi
    }
    raw_status=$(acpi -b | cut -d, -f2 | egrep -o '[0-9][0-9]*[0-9]')
    if [ "x${raw_status}" = "x" ]
    then
        # No battery, must be AC
        echo "\x04AC"
    else
        charge_stat
        # Calculate status
        calc_status=$(( $raw_status / 20 ))
        # Make status
        case $calc_status in
            0)
                # under 19%: RED
                echo -e "\x06${raw_status}$charge_status" ;;
            1)
                # under 39%: YELLOW
                echo -e "\x06${raw_status}$charge_status" ;;
            2)
                # under 59%: NORMAL
                echo -e "\x04${raw_status}$charge_status" ;;
            3)
                # under 79%: NORMAL
                echo -e "\x04${raw_status}$charge_status" ;;
            4)
                # under 99%: NORMAL
                echo -e "\x04${raw_status}$charge_status" ;;
            5)
                # 100%: NORMAL
                echo -e "\x04${raw_status}$charge_status" ;;
        esac
    fi
}

# make sure directory exists
mkdir -p /tmp/.dwm

# Make sure files exist
touch /tmp/.dwm/{battery,ssid,wlan,volume}

# print all the things
while true
do
    # Print battery percentage
    battery_status > /tmp/.dwm/battery
    # Print SSID to file
    echo "$(iwconfig wlan0 | sed -e '/"/ s/"//g' -e 's/ //g' -ne '/ESSID/ p' | cut -d: -f2)" > /tmp/.dwm/ssid
    # Print wlan-bar
    wlan_bar > /tmp/.dwm/wlan
    sleep 1m
done &