Trigger when all files moved

I have a shell script that I want to run one some files that I have Hazel move from my Download directory. It works on all of the files in the directory (currently) so I don't want to call it while Hazel is moving files.

Is there a way to get Hazel to trigger a shell script if there are no files of a specific extension in the Downloads?

You can use nested conditions (check the manual) to match a folder based on its contents. Note, though, that you will need to monitor the folder that contains that folder since rules do not apply to the monitored folder.

Thanks. I'll give that a try and see what I can come up with