Unable to format include! files

[JP-Ellis]

I have a use-case in which I have sometimes very large mathematical expressions which, for the sake of code clarity, are contained in a separate file and included into the code with the include! macro.

It would be nice if rustfmt could format these included files as well. Currently it is unable to do so as they are not valid rust code on their own.

A very simple example would be:

func.inc.rs

(((8.11757) + ((x) * ((4.49504) + ((x) * ((5.99194) + ((x) * ((6.65951) + ((x) * ((6.32449) + ((x) * ((9.07255) + ((x) * ((9.9719) + ((x) * ((2.7438) + ((x) * ((7.59082) + ((4.21836) * (x))))))))))))))))))).powi(-1)) * ((5.78209) + ((x) * ((4.60331) + ((x) * ((1.60796) + ((x) * ((1.5818) + ((x) * ((5.72673) + ((x) * ((0.879603) + ((x) * ((2.03822) + ((x) * ((5.84432) + ((x) * ((7.51743) + ((5.4175) * (x)))))))))))))))))))

main.rs

fn main() {
   let f = |x| include!("func.inc.rs");
   // Do something with f
}

Is there any way that rustfmt could format func.inc.rs? Or could this be implemented in the future?

[topecongiro]

Is there any way that rustfmt could format func.inc.rs?

It's not possible with the current implementation for several reasons.

1. func.inc.rs is not visible to cargo fmt as it's not part of the ast.
2. If somehow cargo fmt can find it, rustfmt cannot format it because it is not a valid code on its own.

Or could this be implemented in the future?

It's possible, though the priority is low.