TMUX snippet

.bashrc

_start_tmux() {
  # Skip if we're not interactive
  [ -z "$PS1" ] || return
  echo $- | grep -qs i || return

  # Skip if we're logged in via VSCode
  [ -z "$VSCODE_IPC_HOOK_CLI" ] || return

  # Skip if we're not on an ssh connection
  [ -z "$SSH_CONNECTION" ] && return

  # Skip if no tmux installed
  hash tmux tmux 2>/dev/null || return

  # Skip if we're already in a tmux/screen session
  [ "$TERM" = "screen" ] && return
  [ "$TERM" = "screen-bce" ] && return
  [ -z "$TMUX" ] || return

  # Skip on ssh to local host
  [[ $SSH_CONNECTION =~ ::1\ .*\ ::1\ .* ]] && return

  # Skip if not a hooman on the other side
  # This might be covered by _interactive above...
  [ -z "$PS1" ] || return

  # Start, or attach to a tmux session
  t0=$(date +%s)
  tmux attach
  if [ $? != 0 ]; then
    echo "new-session" 1>&2
    tmux
  fi
  t1=$(date +%s)

  # Above could be accomplished with this on a newer tmux
  # exec tmux new-session -s ssh -A

  # Don't exit if we returned fast
  if [ $(($t0 + 5)) -gt $t1 ]; then
    echo "tmux exited quickly, here's a shell." 1>&2
  else
    exit
  fi
}

_start_tmux