nowm

#!/bin/bash

screenSize() {
    wattr xywh `lsw -r`
}

maximize() {
    local win=$1
    read x y w h < <(screenSize)
    wmv -a $x $y $win
    wrs -a $w $h $win
}

for w in $(lsw); do maximize $w; done

wew | while read line; do
    event="$(printf '%s' "$line" | cut -d: -f1)"
    window="$(printf '%s' "$line" | cut -d: -f2)"

    case "$event" in
        17|18) # window went away
            wtf $(lsw | tail -n 1)
        ;;
        19) # map window
            wattr o $window || maximize $window
            wtf $window
        ;;
    esac
done