dotfiles/i3/i3/scripts/battery

#!/bin/bash

rundir="$RUNDIR/batwarn"
logfile="$LOGDIR/batwarn.log"

_PATH_WARN_1="$rundir/batwarn1"
_PATH_WARN_2="$rundir/batwarn2"

_THRESHOLD1=25
_THRESHOLD2=5

acpi_output=$(acpi -b)

log() {
    printf '%s\n' "[$(date +%FT%T)] $*" >> $logfile
}

charging() {
    [[ "$status" == "C" ]]
}

discharging() {
    [[ "$status" == "D" ]]
}

threshold1() {
    (( $percent <= $_THRESHOLD1 ))
}

threshold2() {
    (( $percent <= $_THRESHOLD2 ))
}

notify_threshold1() {
    notify-send --icon dialog-warning "Battery below ${_THRESHOLD2}%" --expire-time 0
}

notify_threshold2() {
    notify-send --icon dialog-warning "Battery below ${_THRESHOLD1}%" --expire-time 30000
}

if [[ -n "$acpi_output" ]] ; then
    has_battery=1
    percent="$(printf '%s' "$acpi_output" | grep -oP '\d+(?=%)')"
    if [[ $percent == 100 ]] ; then
        status="F"
    else
        status="$(printf '%s' "$acpi_output" | grep -oP '(?<=: )\w+(?=,)' | cut -c 1 )"
    fi
else
    has_battery=0
fi

if (( has_battery )) ; then
    if discharging ; then
        if threshold2 ; then
            if [[ ! -f "$_PATH_WARN_2" ]] ; then
                log "battery fell below $_THRESHOLD2 percent. issuing warning."
                touch "$_PATH_WARN_2"
                notify_threshold1
            fi
        elif threshold1 ; then
            if [[ ! -f "$_PATH_WARN_1" ]] ; then
                log "battery fell below $_THRESHOLD1 percent. issuing warning."
                touch "$_PATH_WARN_1"
                notify_threshold2
            fi
        fi
    elif charging ; then
        if [[ -f "$_PATH_WARN_1" ]] ; then
            log "charging now. resetting warnings."
            rm "$_PATH_WARN_1"
        fi
        [[ -f "$_PATH_WARN_2" ]] && rm "$_PATH_WARN_2"
    fi

    if threshold2 ; then
        color="#FF0000" # red
        urgent=1
    elif threshold1 ; then
        color="#FFFF00" # yellow
        urgent=0
    else
        color="#FFFFFF" # white
        urgent=0
    fi

    printf '%s\n' "${status}  ${percent}%"
    printf '%s\n'
    printf '%s\n' $color
    (( $urgent )) && exit 33
    exit 0
else
    printf '%s\n' "no battery"
    printf '%s\n'
    printf '%s\n' "#FFFFFF"
fi