Check pacman last upgrade time

check_upgrade.sh

# won't handle situations where /var/log/pacman.log doesn't exist or full system upgrade not run once

last_upgrade_time=$(grep "\[PACMAN\] starting full system upgrade" /var/log/pacman.log | tail -1 | grep -oP '\[\K[^\]]+' | head -1)
last_upgrade_utime=$(date '+%s' -d "$last_upgrade_time")
current_utime=$(date '+%s')

time_diff=$(( $current_utime - $last_upgrade_utime ))
day_diff=$(( $time_diff / 86400 ))
hour_diff=$(( ($time_diff - 86400 * $day_diff) / 3600 ))

# colors
RED='\033[31m'
NC='\033[0m'

if (( $day_diff > 6 )); then
	echo -e "${RED}You have not upgraded your system for ${day_diff} days ${hour_diff} hours!${NC}"
	echo "Check Arch news page and Run \"pacman -Syu\" to upgrade."
else
	echo "System last upgraded at ${last_upgrade_time} (${day_diff} days ${hour_diff} hours ago)."
fi