'default apps' / register filetypes

[GsakuL]

a way to connect any "consumer"(editors, like #17 ?) and any "producer" (file managers, like #11).

my thoughts thus far:

either: a (singleton / static) class as middleware

• should register on app side (no edit in register service) at boot => how?
• class may provide a overview in the gui of what is currently mapped
• producers just call e.g. an Middleware.open method
  • maybe return if it was successful (or NoApplicationFoundError or something)
  • or let middleware show an error message directly
• middleware saves / loads a file for the mapping
  • more useful when more apps can work on the same type

or as custom event (like pygame_gui extends pygames user events). But there must be a clever way, to avoid having an instance of all apps

That said, I have no idea how others have done this.
Any ideas are welcome.

[dargonforce]

if we're going to have something like this imo it should be configurable, and preferably a part of some wider persistent system state implementation. #27 might be relevant.