ExIcal is locked to an old version of Timex about ex_ical HOT 2 CLOSED

It's a great idea. Didn't notices that they updating Timex so fast. Anyway I think this is a great solution. We will not depend on specific library. It will fit to any project. We can support interfaces for most popular libraries.

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Yay! 😄

I think that using mix config probably makes the most sense for this. Since project config supersedes app config, we could set defaults in-app and parent project would be able to override them. This setup should be pretty testable too–we can manually set the config with Application.put_env/4 and test the adapter interface against all built-in options.

For an example, Ecto uses almost the same pattern: they have Application.get_env/3 and a case statement to select the adapter class in tests (though they use env vars) and a set of functions/macros to get the class in lib (some example usage here: Ecto.Adapters.SQL, case statement in tests).

Maybe starting with a fixed set of adapters for the most common cases would be easiest (maybe the current versions on timex and calendar)? After that, the option to add custom adapters can be added.

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