Add `Preferences::once` method

[4e554c4c]

Although asking for system preferences in a loop is an anti-pattern, applications often need to collect preferences at startup. A ::once method would be useful to acquire preferences for startup (while blocking) and before waiting on preference changes in the main loop.

[bash]

That seems like a good addition to me :)

I think the API probably would take a timeout so we don't wait forever (mostly relevant on Linux where we fetch the settings via DBus).

It should probably also return not only the result, but also an object where you can then subscribe on for updates (so no initialization work is wasted ^^).

[4e554c4c]

is there much setup work that will be shared between platforms? on linux at least the method for getting a single preference (calling settings) and the subscription (signals) are entirely different.

[bash]

I was mostly thinking about windows where I create a dedicated thread for COM (but maybe that's not too bad if it's done twice 🤷🏼)

[bash]

Aaaaaaaand implemented: Preferences::once_blocking 🎉 Available in 0.1.10

[4e554c4c]

thanks!