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#!/bin/bash
while true; do
# get battery status
acpi_info=$(acpi)
stat=$(echo $acpi_info | awk -F" " '{print $3}')
stat=${stat::-1}
perc=$(echo $acpi_info | awk -F" " '{print $4}')
perc=${perc::-2}
# check if battery is discharging
if [[ $stat == Discharging ]]; then
# send notification if low power
if [[ $perc -le 15 ]]; then
notify-send -a Battery BATTERY\ CRITICAL\ -h int:value:$perc -u critical
elif [[ $perc -le 30 ]]; then
notify-send -a Battery Battery\ low\ -h int:value:$perc
fi
fi
# calculate time until next check using interpolating polynomial
# of points (battery %, time [s] until next check):
# (100, 600)
# (50, 120)
# (30, 60)
# (15, 30)
# (0, 0)
x1=$(echo "scale=10; 188/85*$perc" | bc)
x2=$(echo "scale=10; -603/29750*$perc*$perc" | bc)
x3=$(echo "scale=10; 113/297500*$perc*$perc*$perc" | bc)
x4=$(echo "scale=10; 3/1487500*$perc*$perc*$perc*$perc" | bc)
sleep_time=$(echo $x1+$x2+$x3+$x4 | bc | awk -F"." '{print $1}')
# sleep for calculated time
sleep $sleep_time
done
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