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#!/bin/sh
capacity_threshold=90
battery_dir=/sys/class/power_supply/BAT0
status_file=$battery_dir/status
capacity_file=$battery_dir/capacity
UNIT=powerloss-handler
CMD=$0
self_install()
{
systemctl --user reset-failed "$UNIT" 2>/dev/null
systemd-run --user \
--unit "$UNIT" \
--property Restart="on-failure" \
-- "$CMD"
}
go()
{
read capacity < "$capacity_file" || return
case "$capacity" in
'' | *[^0-9]*)
echo "Error: unexpected value for battery capacity: $capacity" >&2
return 1 ;;
esac
read status < "$status_file" || return
if [ -t 2 ]
then
printf '\r %20s %.2d%%\r' "$status" "$capacity" >&2
fi
[ "$status" = Discharging ] || return 0
if [ "$capacity" -lt "$capacity_threshold" ]
then
systemctl suspend
fi
}
main()
{
while true
do
go
sleep 1
done
}
if [ "$1" = install ]
then
self_install
else
main
fi
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