Simple enough: when your highlights are triggered, send a notification to you on Pushover.
Currently the sole distinguishing feature of this plugin is that it forks before sending, because on my tiny low-power ARM server sending the notification blocked just enough to annoy me.
Requires LWP::UserAgent. If you don't have it, try something like sudo apt-get install libwww-perl.
Let's face it, if you're the sort of person who's using irssi you probably already know this, but:
Install it by putting it into ~/.irssi/scripts/
If you want it to automatically run, symlink the script into ~/.irssi/scripts/autorun/
You have to provide a user token for messages to be sent to. It's on your dashboard.
/set pushover_user = [token here]
If you want to use your own application key, make one in your dashboard and then do:
/set pushover_app = [token here]
You can make sure it's working by going:
/pushover send This is a test message