macOS Launching a Script after Sleep or Screen Saver exit

[sant0sk1]

Hi!

I want to run a Ruby script I after certain system events. The events I'm interested in are:

1. awake from sleep
2. exit screen saver
3. network connection established

I originally just used cron to schedule this script but I've been reading a bit about launchd and it seems to be the preferred way to launch scripts. Is there a way to achieve my goal using launchd?