#!/usr/bin/env bash

terminal_index=$(tmux show-options -wqv @terminal_pane_index)
main_window=$(tmux display-message -p -F '#{window_index}')
main_pane=$(tmux display-message -p -F '#{pane_index}')

if [[ -z "$terminal_index" || ! "$terminal_index" =~ ^[0-9]+$ ]]; then
    tmux split-window -v
    new_pane_index=$(tmux display -p "#{pane_index}")
    tmux set-option -w @terminal_pane_index "$new_pane_index"
else
    if tmux list-panes -F "#{pane_index}" | grep -q "$terminal_index"; then
        tmux select-pane -t "$main_pane"
        tmux break-pane -d -n "term" -s "$terminal_index" 
    else
        tmux join-pane -v -s "term" -t "$main_window"
    fi
fi