#!/usr/bin/env bash
CONF="$TMUX_PLUGINS_PATH/lastpane"
swap() { tmux swap-pane -s"$1" -t"$2"; }

target=
case $1 in
  up) target="U" ;;
  down) target="D" ;;
  left) target="L" ;;
  right) target="R" ;;
  master) target="M" ;;
  *) exit 1 ;;
esac

src_pane=$(tmux display-message -p "#P")
tmux select-pane -${target}

dst_pane=$(tmux display-message -p "#P")
tmux select-pane -${src_pane}

[[ "$target" == M ]] && dst_pane=0
swap "$src_pane" "$dst_pane"
tmux select-pane -t"$dst_pane"