Script to resize and position an X11 window using wmctrl

rpw

#!/bin/bash

# Help
if [ "help" == "$1" ]
then
	less <<EOF
Resize and position a window.

Usage:
	rpw window_substring [dimension [position]]
 
window_substring:
	A substring of the title of the window being resized
	or "0" or "active" for the active window.
	
	Default: Active window.

dimension:
	Dimension to resize the window to.
	
	Possible values are:
		NxN  : Width and height specified
		xN   : Height specified, autocompute width
		Nx   : Width specified, autocompute height
		N    : Width and height are the same
		0    : Autocompute width and height
		''   : Autocompute width and height

	Auto-computation of width and height are based on
	the desktop dimension's ratio.
		
	If auto-computation of both width and height are
	needed then the height is first processed using a
	set of breakpoints and then the width is calculated
	based on the desktop dimension's ratio.
	
	Height breakpoints are:
	1440, 1080, 900, 768, 720 and 576
	
position:
	Where to position the window being resized.

	Default: center

	Possible position values are:
		center/c/middle/m
		northwest/nw/topleft/tl
		northeast/ne/topright/tr
		southwest/sw/bottomleft/bl
		southeast/se/bottomright/br
		north/n/top/t
		south/s/bottom/b
		east/e/right/r
		west/w/left/l
EOF
	exit
fi

# Default window
[[ "$1" =~ ^0*$ ]] && window="active" || window=$1

# Get dimension of current active desktop
x=`wmctrl -d | grep -oE '\* DG: [0-9]+x[0-9]+' | cut -d' ' -f3`
desktopW=`cut -d'x' -f1 <<<"$x"`
desktopH=`cut -d'x' -f2 <<<"$x"`

width=$(cut -d'x' -f1 <<<"$2")
height=$(cut -d'x' -f2 <<<"$2")

if [[ "$height" =~ ^([^0-9]|0)*$ ]]; then
	if [[ "$width" =~ ^([^0-9]|0)*$ ]]; then
		# Compute Default Height
		defaultH=$desktopH
		# Compute default height from breakpoints
		for x in 576 720 768 900 1080 1440; do [[ "$desktopH" -gt "$x" ]] && defaultH="$x" || break; done
		# Set height to default if 0 or not numeric 
		[[ "$height" =~ ^([^0-9]|0)*$ ]] && height=$defaultH
	else
		height=$(printf '%.0f' $(bc -l <<<"$width*($desktopH/$desktopW)"))
	fi
fi

if [[ "$width" =~ ^([^0-9]|0)*$ ]]; then
	# Compute width using desktop dimension's ratio
	width=$(printf '%.0f' $(bc -l <<<"$height/($desktopH/$desktopW)"))
fi

# Limit height to desktop height
[[ "$height" -gt "$desktopH" ]] && height=$desktopH
# Limit width to desktop width
[[ "$width" -gt "$desktopW" ]] && width=$desktopW

# Default position
position=${3:-center}


# Compute window coordinates
north=0
south=$(($desktopH - $height))
east=$(($desktopW - $width))
west=0
midX=`bc <<<"$east / 2"`
midY=`bc <<<"$south / 2"`
case "$position" in
	northwest|nw|topleft|tl)
		y=$north
		x=$west
		;;
	northeast|ne|topright|tr)
		y=$north
		x=$east
		;;
	southwest|sw|bottomleft|bl)
		y=$south
		x=$west
		;;
	southeast|se|bottomright|br)
		y=$south
		x=$east
		;;
	north|n|top|t)
		y=$north
		x=$midX
		;;
	south|s|bottom|b)
		y=$south
		x=$midX
		;;
	east|e|right|r)
		y=$midY
		x=$east
		;;
	west|w|left|l)
		y=$midY
		x=$west
		;;
	center|c|middle|m|*)
		y=$midY
		x=$midX
		;;
esac

# target active window
if [ "active" == "$window" ]
then
	window=":ACTIVE:"
fi

# Remove unmaximize and unfullscreen the window
wmctrl -r "$window" -b remove,fullscreen,maximized_vert,maximized_horz
# Move window to current desktop and raise it
wmctrl -R "$window"
# Resize and position the window
wmctrl -r "$window" -e 0,$x,$y,$width,$height