Autotest 100% CPU solution

Autotest is great, but when it is waiting for test, my MacBook turns into a whirlwind as autotest takes 100% CPU. After looking at autotest.rb, we easily find the waiting function:

def wait_for_changes
  hook :waiting
  Kernel.sleep self.sleep until find_files_to_test
end

As self.sleep is defaulted to 1 it means that my laptop does not sleep at all. Changing this is quite easy, as you can just add this to your .autotest file in your home directory:

Autotest.add_hook :initialize do |at|
  at.sleep = 5
end

Experiment with the amount to determine what works for you. Offcourse autotest will now react slower to you changes, but hey: you can't have everything. Enjoy the silence!