#!/bin/sh
set -eu

OUTFILE="$HOME/pics/screenshots/$(date +"%Y-%m-%d_%H-%M-%S").mp4"

LOCKFILE="/tmp/ffrec.pid"
[ -s "$LOCKFILE" ] && xargs kill < "$LOCKFILE" && notify-send "Recording saved to $OUTFILE" && rm -f "$LOCKFILE" && exit 0

errecho() {
	>&2 echo "$@"
}

usage() {
	errecho "usage: ${0##*/} [-h] [-a SOURCE] [-r FPS]"
	errecho
	errecho " -h:   show this message and exit"
	errecho " -a:   record audio from SOURCE (only with PA / pipewire-pulse) (set to \"\" for alsa output)"
	errecho " -r:   set recording framerate to FPS (default: 60)"
}

while getopts :ha:r: OPT; do
	case "$OPT" in
		h) usage; exit 0;;
		a) AUDIO="-f pulse -i ${OPTARG:-alsa_output.pci-0000_30_00.6.analog-stereo.monitor}" ;;
		r) FPS="$OPTARG" ;;
		*) errecho "ffrec: invalid option: -$OPTARG"; exit 1 ;;
	esac
done

IFS=" " read -r SIZE OFFSET <<-EOF
	$(hacksaw -f "%wx%h %x,%y")
EOF
[ -z "$SIZE" ] && exit 1 # if slop was cancelled don't record

(
	flock -n 9
	set -f
	ffmpeg -thread_queue_size 512 -f x11grab -show_region 1 -framerate "${FPS:-60}" -s "$SIZE" -i "$DISPLAY.0+$OFFSET" ${AUDIO:-} -c:v libx264 -crf 21 -preset:v fast "$OUTFILE" &
	set +f
	echo "$!" > "$LOCKFILE"
	notify-send "Recording Started!"
	wait
) 9>"$LOCKFILE"