Tmux function to look for .tmux file

tmux_function

# Tmux
function tmux() {
  # Make sure even pre-existing tmux sessions use the latest SSH_AUTH_SOCK.
  # (Inspired by: https://gist.github.com/lann/6771001)
  local SOCK_SYMLINK=~/.ssh/ssh_auth_sock
  if [ -r "$SSH_AUTH_SOCK" -a ! -L "$SSH_AUTH_SOCK" ]; then
    ln -sf "$SSH_AUTH_SOCK" $SOCK_SYMLINK
  fi

  # If provided with args, pass them through.
  if [[ -n "$@" ]]; then
    env SSH_AUTH_SOCK=$SOCK_SYMLINK tmux "$@"
    return
  fi

  # Check for .tmux file (poor man's Tmuxinator).
  SESSION_NAME=$(basename "$(pwd)")
  if tmux has-session -t $SESSION_NAME 2> /dev/null; then
    # Attach to existing session
    env SSH_AUTH_SOCK=$SOCK_SYMLINK tmux attach -t $SESSION_NAME
  elif [ -f .tmux ]; then
    # Prompt the first time we see a given .tmux file before running it.
    local DIGEST="$(openssl sha -sha512 .tmux)"
    if ! grep -q "$DIGEST" ~/.tmux.digests 2> /dev/null; then
      cat .tmux
      echo 'Trust (and run) this .tmux file? (t = trust, otherwise = skip) '
      read  REPLY
      echo
      if [[ $REPLY =~ ^[Tt]$ ]]; then
        echo "$DIGEST" >> ~/.tmux.digests
        . .tmux
        return
      fi
    else
      . .tmux
      return
    fi
  else
    # Create new session
    env SSH_AUTH_SOCK=$SOCK_SYMLINK tmux new -A -s "$SESSION_NAME"
  fi
}