format, println, eprintln with facet

[vron]

One of the things that facet "promisses" is to avoid implementing e.g. Debug on all types. In practice however I find thats its inconvenient to not do it, If I remove Debug and I want to "debugW using e.g. eprintln!() i often have to go through and add Debug to loats of structs just to print one (that includes others).

I.e. in practice I find myself leaving the derive[Debug] in for those situations.

Should we have a facet-print or somthing that provides the equivalents of format, print, eprint but uses facet to print? (With some smart "selection" such that {} only prints a little and {:?} prints the whole glory facet-pretty?

stuff like eprintln!("{} {} {}", a.pretty(), b.pretty(), c.pretty()) is possible but quickly gets annoying

[vron]

or an alternative, could we have an extension trait that is implemented for all types that implements Facet with a method say "p()" that casts it to a facet::Value wrapper that implements both Debug and Display, then we could use the rust built in format!, print! etc and get both "Display" and "Debug" for free, something like:

// mycrate
use facet-debug.:*;

fn tests() {
  let v = MyCustomStructDerivingFacet::new();
  let a = format!("short:{}, long multi line: {:?}", v.p(), v.p());
  eprintln!("short:{}, long multi line: {:?}", v.p(), v.p());

}

That could be really rather nice actually - we could get one "Display" for "free" as a user, but still possible to implement a custom Display on our own type if we want.

The one thing that "bothers" is the p() (or whatever, but should be short) -but I see no way around that.

If something like this was created (or maybe it exists and i have missed it) the big question i guess would be - what should the default Display show

[fasterthanlime]

or maybe it exists and i have missed it

Yeah it's facet-pretty?

[vron]

Hmm, maybe I have missed somthing, does it provide a "short printing" option a la Display, not printing every field over multiple lines?

[fasterthanlime]

No, but that would be the right place to add it

[theduke]

There should be a way to derive Debug for facet types, which internally will just use facet-pretty to render the output!