cfg/bin/lock

#!/bin/bash
set -euo pipefail

scrot /tmp/screen.png
convert /tmp/screen.png -scale 5% -scale 2000% /tmp/screen.png

if [[ -f ${HOME}/.config/screen-lock.png ]]; then
	# placement x/y
	px=0
	py=0
	# lockscreen image info
	r=$(file ${HOME}/.config/screen-lock.png | grep -o '[0-9]* x [0-9]*')
	rx=$(echo $r | cut -d' ' -f 1)
	ry=$(echo $r | cut -d' ' -f 3)

	sr=$(xrandr --query | grep ' connected' | sed 's/primary //' | cut -f3 -d' ')
	for res in $sr; do
		# monitor position/offset
		srx=$(echo $res | cut -d'x' -f 1)                   # x pos
		sry=$(echo $res | cut -d'x' -f 2 | cut -d'+' -f 1)  # y pos
		srox=$(echo $res | cut -d'x' -f 2 | cut -d'+' -f 2) # x offset
		sroy=$(echo $res | cut -d'x' -f 2 | cut -d'+' -f 3) # y offset
		px=$((srox + srx / 2 - rx / 2))
		py=$((sroy + sry / 2 - ry / 2))

		convert /tmp/screen.png ${HOME}/.config/screen-lock.png -geometry +$px+$py -composite -matte /tmp/screen.png
		echo "done"
	done
fi

i3lock -e -f -n -i /tmp/screen.png