angular-ical is an Angular factory wrapper for ical.js
ICAL doesn't have to be accessed by the window object. Use dependency injection instead. Great for unit test and do everything in the Angular manner.
Add ngIcal as a module dependency to your app after including the angular-ical.js script and inject ical anywhere you need.
NOTE: the service ical is the same object as window.ICAL. We prefer camelCase in Angular for objects.