vincentbernat.i3wm-configuration/bin/xss-lock

#!/bin/bash

me="$(readlink -f "$0")"
timeout=300
notify=10

configure() {
    xset s $((timeout - notify)) $notify
    xset dpms $((timeout * 3)) $((timeout * 4)) $((timeout * 5))
}
unconfigure() {
    xset s 0
    xset dpms 0 0 0
}

case "$1" in
    start)
        configure
        exec xss-lock -s ${XDG_SESSION_ID} -n "$me notify" -l $me lock
        ;;
    dim|notify)
        echo "notify: start"
        redshift=$(systemctl --user show \
                             --property MainPID \
                             --value redshift@$(systemd-escape -- "$DISPLAY").service)
        [ x$redshift = x ] || kill -STOP $redshift
        trap "[ x$redshift = x ] || kill -CONT $redshift" EXIT
        trap 'kill %% 2> /dev/null; exit 0' HUP  # user activity
        trap 'sleep 0.2s; kill %% 2> /dev/null; exit 0' TERM # locker started
        outputs=($(xrandr -q | sed -n 's/\([^ ]*\) connected .*/\1/p'))
        for i in $(seq 0.7 -0.01 0.1); do
            for out in ${outputs[@]}; do
                xrandr --output $out --brightness $i || \
                    outputs=("${outputs[@]/$out}")
            done
            sleep 0.1
        done
        echo "notify: end"
        sleep infinity &
        wait
        ;;
    lock)
        # Something may have mendled with screensaver settings
        configure
        # First, stop any music player
        xdotool key XF86AudioStop
        # Then, lock screen
        echo "lock: lock screen"
        systemctl --user stop compton@$(systemd-escape -- "$DISPLAY").service
        i3lock -n -e -i $HOME/.cache/awesome/current-wallpaper.png -t -f
        systemctl --user start compton@$(systemd-escape -- "$DISPLAY").service
        echo "lock: unlock screen"
        ;;
esac