Complex formatting settings are ignored

[QazerLab]

I'm trying to migrate my project from using colored to ansi_term, as one of my dependencies already uses the latter. I was expecting this to be a straightforward replacement, but faced an issue: the Display implementation in ansi_term seems to ignore the formatting settings, e.g. with the following code

const DIGITS: &'static str = "1234567890";

fn main() { 
    let s = Color::Red.paint(DIGITS);
    println!("{:.5}", s);
}

the expected behavior is: the provided format string is used; red string 12345 is printed;
the actual behavior is: the formatting settings are ignored; red string 1234567890 is printed.

Is this intentional, or a bug?

rustc: 1.38.0
ansi_term: 0.12.1

[joshtriplett]

That does indeed look like a bug to me, albeit a difficult one to fix.

[d-e-s-o]

I am hitting the same problem :-(

[zzau13]

I have forked this library because I needed it to depend on std::fmt::Dispay.
But, can you solve the problem with:

Style::default().paint_fn(|f| write!(f, "{:.5}", 1.0))

I leave you the link to the coverage, repository and documentation