#!/bin/sh

usage () {
	cat <<EOF>&2
Usage: ${0##*/} [TRANSFORM]

Apply TRANSFORM to the X screen renderer:
- zoomin
- zoomout
- starwars

When no transform is specified, reset the screen to the defaults.

EOF
}

if [ $# -eq 0 ]; then
	xrandr --output "$(xrandr | awk 'NR==2 {print $1; exit}')" --auto --transform none && \
		xrandr -s "$(xrandr | awk '/^ / {print $1;exit}')"
	exit
fi

case "$1" in
-h)
	usage;;
zoomin)
	xrandr --output "$(xrandr | grep -m1 "\<connected\>" | cut -f1 -d" ")" --scale 0.8x0.8 ;;
zoomout)
	xrandr --output "$(xrandr | grep -m1 "\<connected\>" | cut -f1 -d" ")" --scale 1.2x1.2 ;;
starwars)
	xrandr --output "$(xrandr | grep -m1 "\<connected\>" | cut -f1 -d" ")" --transform 1.24,0.16,-124,0,1.24,0,0,0.000316,1 ;;
*)
	usage;;
esac