#
  # If the tt command is called without an argument, launch Textastic
  # If tt is passed a directory, cd to it and open it in Textastic
  # If tt is passed a file, open it in Textastic
  #
  function tt() {
      if [[ -z "$1" ]]
      then
          open -a "textastic.app"
      else
          open -a "textastic.app" "$1"
          if [[ -d "$1" ]]
          then
              cd "$1"
          fi
      fi
  }