split.grid

#!/bin/bash
#
# Author:       Twily                                                     2015
# Description:  Cut window in half and spawn a terminal in its remaining space
# Requires:     wmctrl, xdotool, xwininfo, urxvt
# Useage:       $ sh ./split.grid
#               (Eg.: Bind script to trigger on hotkey W-s)
#

ACT=$(xdotool getactivewindow)

G=24            # Gap between windows
D=0             # Decoration height
M=0             # Border width

let M=$M*2
if [ "$D" -gt "0" ]; then D=$(( $D + ( $M / 2 ) )); fi

unset X Y W H
eval $(xwininfo -id $ACT |
    sed -n -e "s/^ \+Absolute upper-left X: \+\([0-9]\+\).*/X=\1/p" \
           -e "s/^ \+Absolute upper-left Y: \+\([0-9]\+\).*/Y=\1/p" \
           -e "s/^ \+Width: \+\([0-9]\+\).*/W=\1/p" \
           -e "s/^ \+Height: \+\([0-9]\+\).*/H=\1/p" )

    X=$(( $X - ( $M / 2 ) ))
    Y=$(( $Y - ( $M / 2 ) - $D ))

if [ "$W" -gt "$H" ]; then
    # Spawn right
    aW=$(( $W / 2 - ( $G / 2 ) - $M ))

    wmctrl -i -r $ACT -e 0,$X,$Y,$aW,$H

    X=$(( $X + $aW + $G + $M ))
    W=$(( $W - $aW - $G - $M ))
else
    # Spawn below
    aH=$(( $H / 2 - ( $G / 2 ) - ( $M / 2 ) - $D ))

    wmctrl -i -r $ACT -e 0,$X,$Y,$W,$aH

    Y=$(( $Y + $aH + $G + $D + $M ))
    H=$(( $H - $aH - $G - $D - $M ))
fi

urxvt -g "1x1+"$X"+"$Y &

for i in {0..49}; do # timeout
    if ps -p $! >/dev/null; then
        sleep .1

        wmctrl -r :ACTIVE: -e 0,$X,$Y,$W,$H
        break
    fi
done

exit 0