Propagate formatting parameters to each components for more types

[nical]

Following up on #419, ensure the Debug and Display implementations propagate formatting parameters for more of euclid's types.

This allows people to control, for example, the number of digits in the formatting syntax like println!("{:.3?}", rect);.

[nical]

r? @kvark

[kvark]

sad

[kvark]

this should be raised at a lower level, i.e. the "proper" way to go here is unnecessary verbose :/
I could imagine something like write!(f, "Box2D({:~?}, {:~?})", self.min, self.max) that would propagate the f parameters automatically. Could you raise that issue upstream?

[nical]

I agree with you, I think that the feature worth it though.

Could you raise that issue upstream?

I don't have the steam to champion an RFC for this at the moment, I'm asking around to see if I could get away requesting a feature like that directly as a github issue.

In the process @nox pointed out that for simple Debug formats we can do:

        f.debug_tuple("Box2D")
            .field(&self.min)
            .field(&self.max)
            .finish()

This is a bit nicer although it only works for Debug (no equivalent Display helpers), and won't work for Rect({size} at {origin}) as far as I can tell.

Would you prefer that I convert the debug impls that I can to this syntax or keep the more verbose but consistent way?

In any case I'd like to land this in some form of another without waiting for a potentital future version of the standard library.

[kvark]

Converting the debug seems like an improvement to me, not a blocker to land this though.

Also, perhaps RFC isn't necessary the first step, but rather opening an issue saying that there is a problem here.

[nical]

I converted the debug impls to use debug_tuple where applicable and filed rust-lang/rust#70710

[nical]

@bors-servo r=kvark

[bors-servo]

📌 Commit a61891b has been approved by kvark

[bors-servo]

⌛ Testing commit a61891b with merge 0051e76...

[bors-servo]

☀️ Test successful - checks-travis
Approved by: kvark
Pushing 0051e76 to master...

[nox]

Honestly I would just not implement Display.