I wish that I could access my PIM data through a filesystem, and ideally synchronize using regular file sync features. I'm talking things like contacts, calenda

I wish that I could access my PIM data through a filesystem, and ideally synchronize using regular file sync features. I'm talking things like contacts, calendar events, bookmarks, etc. Give me semi-structured (probably yaml, I know it has issues but I like it) data and let me add arbitrary notes and fields.