Announcing format: utility crate to make it easier to work with the Formatter

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format is utility crate to make it easier to work with the Formatter.

It defines format wrappers (Debug, Display, Binary, ...) which implements respectively traits. For example LowerHex impl fmt::LowerHex, fmt::Display and fmt::Debug traits. Also it defines lazy_format helper macro.

Examle usage:

struct Foo(usize);

impl Debug for Foo {
    fn fmt(&self, f: &mut Formatter) -> Result {
        let alternate = f.alternate();
        let bar = lazy_format!(|f| if alternate {
            write!(f, "{:#x}", self.0)
        } else {
            write!(f, "{:x}", self.0)
        });
        f.debug_tuple("Foo").field(&bar).finish()
    }
}

Solves some problem like this

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