bspside

#!/bin/sh

case "$#" in
    '1') ;;
    '0') echo "No arguments given." >&2; exit 2 ;;
    *)   echo "Too many arguments." >&2; exit 2 ;;
esac

dir=$1

case "$dir" in
    'west'|'east'|'south'|'north') ;;
    *) echo "invalid argument: $1" >&2; exit 2 ;;
esac

ensure_tiled()
{
    # if the focused node is not a window, we don't need to do anything.
    bspc query -N -n focused.window > /dev/null \
        || return

    # let's not change the state of the focused window to tiled if
    #  the (user) layout of the focused desktop is not tiled.
    bspc query -D -d focused.user_tiled > /dev/null \
        || return

    # if the state of the focused window is neither tiled nor pseudo_tiled,
    #  change its state to its last state;
    #  if its state is still neither tiled nor pseudo_tiled, change its state
    #  to tiled.
    if
        bspc node focused.fullscreen -t '~fullscreen' \
            || bspc node focused.floating -t '~floating'
    then
        bspc node 'focused.!tiled.!pseudo_tiled.window' -t tiled
    fi
}

# if no node is focused, exit.
bspc query -N -n > /dev/null \
    || exit

# if the focused node is the root node, just call ensure_tiled and exit.
bspc query -N -n '@/.focused' > /dev/null && {
    ensure_tiled
    exit
}

case "$dir" in
    'west'|'north')
        # ensure that the focused node is the 1st child of the root node.
        bspc node '@/1.!focused' -s '@/2.focused' || {
            bspc node '@/1.!focused#focused' -n '@/' \
                && bspc node '@/1.!focused' -s '@/2.focused'
        }
        ;;
    'east'|'south')
        # ensure that the focused node is the 2nd child of the root node.
        bspc node '@/2.!focused' -s '@/1.focused' \
            || bspc node '@/2.!focused#focused' -n '@/'
        ;;
esac

case "$dir" in
    'west'|'east')
        # ensure that the split type of the root node is vertical.
        bspc node '@/.!vertical' -R -90 \
            && bspc node '@brother' -R 90
        ;;
    'north'|'south')
        # ensure that the split type of the root node is horizontal.
        bspc node '@/.!horizontal' -R 90 \
            && bspc node '@brother' -R -90
        ;;
esac

ensure_tiled

sxhkdrc

# Move the focused node to the given side of the tiled area.
super + {Left,Up,Right,Down}
        bspside {west,north,east,south}

The current version uses new bspwm features not released in 0.9.10 to simplify the code; if you want an equivalent version that is release compatible, see this revision.