gistfile1.txt

# Just put this in your cron (Runs every 1 minute).
# * * * * *  /home/YOURUSERNAME/bin/suspend-on-low-battery

source /nix/var/nix/profiles/system/etc/profile

UPOWER=$(nix-build -A upower '<nixpkgs>')/bin/upower
NOTIFY_SEND=$(nix-build -A libnotify '<nixpkgs>')/bin/notify-send
DISPLAY=:0.0

battery_device=`$UPOWER -e | grep -i battery | head -n 1`
battery_percentage=`$UPOWER -i $battery_device | grep percentage | head -n 1 | cut -d ':'  -f 2 | tr -d ' ' | tr -d '%'`
battery_state=`$UPOWER -i $battery_device | grep state | head -n 1 | cut -d ':'  -f 2 | tr -d ' '`
 
[ 10 -le $battery_percentage -a $battery_percentage -lt 11 -a $battery_state == "discharging" ] && $NOTIFY_SEND "Battery level at 10 percent"
 
[ 6 -le $battery_percentage -a $battery_percentage -lt 9 -a $battery_state == "discharging" ] && $NOTIFY_SEND "Battery level at $battery_percentage%" -u critical
 
[ $battery_percentage -le 3 -a $battery_state == "discharging" ] && $NOTIFY_SEND "BATTERY LEVEL AT 3%, SUSPENDING!" -u critical && sleep 5 && \
    sudo -n /run/current-system/sw/bin/systemctl suspend