Improved xsetwacom preferences helper

xsetwacom_my_preferences

#!/bin/bash

if [ $# -eq 0 -o "$1" == "--help" ]; then
	echo "Usage: $(basename $0) device screen [-q]"
	echo "device  The device to set the screen for."
	echo "        Possible devices:"
	xsetwacom --list devices | sed -n 's/\(.*\)id:.*/        * \1/p'
	echo "screen  The screen to set the given device's region to."
	echo "        Possible screens:"
	echo "        * screen (the entire display)"
	xrandr -q --current | sed -n 's/^\([^ ]\+\) connected.*/        * \1/p'
	echo "     -q Device and display information are not printed."
	exit
fi

DEVICE="$1"
SCREEN="$2"
ARGS="${@:3}"
xsetwacom --set "${DEVICE}" ResetArea
read AREASX AREASY AREAX AREAY <<< `xsetwacom --get "${DEVICE}" Area`

QUIET=0
for ARG in $ARGS; do
	case $ARG in
		-q)
			QUIET=1
			;;
	esac
done
[ $QUIET -eq 0 ] && echo "Device '${DEVICE}' area ${AREAX}x${AREAY}."

if [ "$SCREEN" = "desktop" ]; then
	LINE=`xrandr -q --current | sed -n 's/^Screen 0:.*, current \([0-9]\+\) x \([0-9]\+\),.*/\1 \2/p'`
	read WIDTH HEIGHT <<< "$LINE"
else
	LINE=`xrandr -q --current | sed -n "s/^${SCREEN}"' connected.* \([0-9]\+x[0-9]\++[0-9]\++[0-9]\+\).*/\1/p'`
	read WIDTH HEIGHT <<< `echo "${LINE}" | sed -n 's/\([0-9]\+\)x\([0-9]\+\)+\([0-9]\+\)+\([0-9]\+\)/\1 \2/p'`
fi
[ $QUIET -eq 0 ] && echo "Screen '${SCREEN}' size ${WIDTH}x${HEIGHT}."

RATIOAREAY=$(( AREAX * HEIGHT / WIDTH ))
RATIOAREAX=$(( AREAY * WIDTH / HEIGHT ))

if [ "$AREAY" -gt "$RATIOAREAY" ]; then
	NEWAREAX="$AREAX"
	NEWAREAY="$RATIOAREAY"
else
	NEWAREAX="$RATIOAREAX"
	NEWAREAY="$AREAY"
fi

xsetwacom --set "$DEVICE" Area 0 0 "$NEWAREAX" "$NEWAREAY"
if [ "$SCREEN" = "desktop" ]; then
	xsetwacom --set "$DEVICE" MapToOutput "desktop"
else
	xsetwacom --set "$DEVICE" MapToOutput "$LINE"
fi