format.sh responds with "Already running".

[EddyPronk]

When IDEA is already running the command-line tool format.sh responds with "Already Running"

IDEA opens a pop-up with the message:
"Only one instance of IDEA can be run at a time"

I guess the code formatting code has a strong dependency on the rest of the product.
This probably means that using the formatting code via the API needs large portions of IDEA to run and can't run in isolation.