#!/bin/bash

base_session="shared-session"
tmux_session_count=`tmux ls | grep "^$base_session" | wc -l`

if [[ "$tmux_session_count" == "0" ]]; then
  echo "Launching tmux base session $base_session ..."
  tmux new-session -s $base_session
else
  # Make sure we are not already in a tmux session
  if [[ -z "$TMUX" ]]; then
    # Kill defunct sessions first
    old_sessions=$(tmux ls 2>/dev/null | egrep "^[0-9]{14}.*[0-9]+\)$" | cut -f 1 -d:)
    for old_session_id in $old_sessions; do
        tmux kill-session -t $old_session_id
    done

    echo "Launching copy of base session $base_session ..."

    # Session is is date and time to prevent conflict
    session_id=`date +%Y%m%d%H%M%S`

    # Create a new session (without attaching it) and link to base session
    # to share windows
    tmux new-session -d -t $base_session -s $session_id

    # Attach to the new session
    tmux attach-session -t $session_id

    # When we detach from it, kill the session
    tmux kill-session -t $session_id
  fi
fi