Track time-usage for Xorg windows

track-window.sh

#!/bin/bash

file="$HOME/.track-window-stats"
period=1

while true
do
    locked=$(loginctl show-session "$XDG_SESSION_ID" -p LockedHint --value)
    if [[ "$locked" == 'yes' ]]; then
        result='<locked>'
    else
        focus="$(xprop -id $(xdotool getwindowfocus) | grep WM_CLASS | cut -f 4 -d'"')"
        if [[ -n "$focus" ]]; then
            result="$focus"
        else
            result='<empty>'
        fi
    fi
    time="$(date +%s)"
    if [[ "$result" == "$lastresult" ]]; then
        sed -i '$d' "$file"
        echo "$lasttime $((time - lasttime + period)) $result" >> "$file"
    else
        echo "$time $period $result" >> "$file"
        lasttime="$time"
        lastresult="$result"
    fi
    sleep "$period"
done