title: AWS CLI command completion with fish shell
body: <p>Has anybody been able to set up auto-complete for the AWS CLI with fish shell? The AWS documentation only offers the guide for bash, tcsh, and zsh.</p>
  
  <p>Bash exports the variables <code>COMP_LINE</code> and <code>COMP_POINT</code> that is used by the aws_completer script provided by the Amazon. Is there any equivalent for fish? I'm new with the fish shell and I'm giving it a try.</p>