title: Autocompletion in bash script arguments
body: <p>I have a simple but use case for autocompletion. For example when I run:</p>
  
  <pre><code>run.sh arg1 'CPU 100 SETTING1 xxx SETTING2 xxx OUTPUT_DIR /home/user/prj2/record_xxx'
  </code></pre>
  
  <p>Usually arg1 can be autocompleted, but the path in arg2, which is a string, cannot be autocompleted. Is there a way to achieve this?</p>