Resize active window to 1/3 of the screen and position it in the middle, right or left part of the display

position-active-window-on-a-third-part-of-display.sh

#!/usr/bin/env bash
#
# Resize active window to 1/3 of the screen and position it in the middle, right or left part of the display
# Tested with XFCE (xserver) and ultra wide monitor (3440x1440)
#
# based on: https://askubuntu.com/questions/104155/center-a-window-via-command-line#answer-571711

# Can this be calculated automagically?
taskBarHeight=63

# Get display WIDTH and HEIGHT
eval $(xdotool getdisplaygeometry --shell)

# Possible window X positions
middleX=$((WIDTH/3))
leftX=0
rightX=$((WIDTH/3 * 2))

# Window width to be 1/3 of the screen
sizeX=$((WIDTH/3 - 1))

# Get active window position X
eval $(xdotool getactivewindow getwindowgeometry --shell | egrep 'X=')

# Had to add 6 pixels to calculations
padding=6
if (( "$X" == $((middleX + padding)) )); then
  newPos=$rightX
elif (( "$X" == $((rightX + padding)) )); then
  newPos=$leftX
else
  newPos=$middleX 
fi

# DEBUG
#echo $X,$leftX,$middleX,$rightX

xdotool getactivewindow windowsize "$sizeX" "$((HEIGHT - taskBarHeight))"
xdotool getactivewindow windowmove "$newPos" "0"