#!/bin/bash
#
# Wrapper around xrandr to set screen resolution.
#

# Parameters
BASENAME="`basename $0`"
X="$1"
Y="$2"

# Check
if [ -z "$Y" ]; then
  echo "usage: $BASENAME <x-res> <y-res>"
  exit 1
elif ! which cvt &> /dev/null; then
  echo "please install cvt from xserver-xorg-core"
  exit 1
elif ! which xrandr &> /dev/null; then
  echo "please install xrandr from x11-xserver-utils"
  exit 1
fi

# Get modeline and interface
MODELINE="`cvt $X $Y | grep -v '^#' | sed -e 's/^Modeline //'`"
INTERFACE="`xrandr | grep " connected" | cut -d ' ' -f 1 | head`"
NAME="`echo $MODELINE | cut -d ' ' -f 1 | sed -e 's/"//g'`"

# Apply
xrandr --newmode $MODELINE &> /dev/null
xrandr --addmode $INTERFACE $NAME
xrandr --output  $INTERFACE --mode $NAME