#! /bin/bash

stat_file=/tmp/.conky_pacman
log_file=/var/log/pacman.log

get_log_date() {
    sed -n "s/\[\(.*\)\] \[PACMAN\] $1/\1/p" \
    /var/log/pacman.log | \
    tail -1 \
    | { read -r f; date -d "$f" +%m-%d-%Y; }
}

write_stats() {
    now=$(date +%s)
    last_upgrade=$(get_log_date "starting full system upgrade")
    last_sync=$(get_log_date "synchronizing package lists")
    tot=$(pacman -Qq | wc -l)
    exp=$(pacman -Qeq | wc -l)
    out=$(pacman -Quq | wc -l)
    orp=$(pacman -Qdtq | wc -l)
    loc=$(pacman -Qmq | wc -l)
    echo "$now" "$last_upgrade" "$last_sync" "$tot" "$exp" "$out" \
         "$orp" "$loc" > "$stat_file"
}

if [[ -f "$stat_file" ]]; then
    last_pacman_update=$(stat -c %Y "$log_file")
    last_stat_update=$(awk '{ print $1 }' "$stat_file")
    if (( last_pacman_update > last_stat_update )); then
        write_stats 
    fi
else
    write_stats 
fi