#!/bin/bash -i
#
# usize: Set urxvt (or terminal which understands the same escape sequences) 
#        size.
# Usage: usize <width> [<height>]
# Usage: usize x<width_multiplier> [x<height_multiplier>]
# Usage: usize X<multiplier>
#

width=${COLUMNS:-80}
height=${LINES:-24}
tmux_prefix=

case $# in
  0)
    echo "Usage: usize $width $height"
    exit 1
  ;;
  1) width=$1;;
  2) width=$1; height=$2;;
esac

# Allow, eg, x2 for width or height.
if [ ! "${width#X}" = "$width" ]; then
  width="${width/X/x}"
  height=$width
fi
if [ ! "${width#x}" = "$width" ]; then
  # Add a column for dividers.
  width=${width#x}
  width=$((width-1+(87*width)))
fi
if [ ! "${height#x}" = "$height" ]; then
  height=${height#x}
  height=$((24*height))
  # Add a row for tmux.
  [ $height -gt 1 ] && height=$((height+2))
fi

[ -n "$TMUX" ] && tmux_prefix="\033Ptmux;\033"
echo -en "$tmux_prefix\033[8;$height;$width;t"
exit 0