fmtastic 0.2.2

Format numbers using the unicode characters via the Display trait.
Documentation 
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use crate::digits::iter_digits;
use crate::integer::{Base, IntegerImpl};
use crate::UnsignedInteger;
use core::fmt;

/// Formats an unsigned integer using seven-segment digits
/// from the [Legacy Computing] block.
///
/// You may need to install an extra font such as [Sieben 7], [Cascadia Code], or [Noto Sans Symbols 2]
/// since most other fonts do not support these digits.
///
/// [Legacy Computing]: https://www.unicode.org/charts/PDF/U1FB00.pdf
/// [Sieben 7]: https://github.com/bash/sieben-7
/// [Noto Sans Symbols 2]: https://fonts.google.com/noto/specimen/Noto+Sans+Symbols+2
/// [Cascadia Code]: https://github.com/microsoft/cascadia-code
///
/// ```
/// use fmtastic::Segmented;
///
/// assert_eq!("🯶🯲🯸", Segmented(628_u32).to_string());
///
/// assert_eq!("🯰", Segmented(0_u32).to_string());
/// assert_eq!("🯱", Segmented(1_u32).to_string());
/// assert_eq!("🯲", Segmented(2_u32).to_string());
/// assert_eq!("🯳", Segmented(3_u32).to_string());
/// assert_eq!("🯴", Segmented(4_u32).to_string());
/// assert_eq!("🯵", Segmented(5_u32).to_string());
/// assert_eq!("🯶", Segmented(6_u32).to_string());
/// assert_eq!("🯷", Segmented(7_u32).to_string());
/// assert_eq!("🯸", Segmented(8_u32).to_string());
/// assert_eq!("🯹", Segmented(9_u32).to_string());
///
/// // Binary
/// assert_eq!("🯰", format!("{:b}", Segmented(0_u8)));
/// assert_eq!("🯱🯰🯱🯰🯱🯰", format!("{:+b}", Segmented(0b101010_u8)));
/// ```
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub struct Segmented<T>(pub T);

impl<T> From<T> for Segmented<T>
where
    T: UnsignedInteger,
{
    fn from(value: T) -> Self {
        Segmented(value)
    }
}

impl<T> fmt::Binary for Segmented<T>
where
    T: UnsignedInteger,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt_seven_segment::<_, <T::Impl as IntegerImpl>::BaseTwo>(self.0.into_impl(), f)
    }
}

impl<T> fmt::Display for Segmented<T>
where
    T: UnsignedInteger,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt_seven_segment::<_, <T::Impl as IntegerImpl>::BaseTen>(self.0.into_impl(), f)
    }
}

fn fmt_seven_segment<T: IntegerImpl, B: Base<T>>(n: T, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    iter_digits::<_, B>(n).try_for_each(|digit| write!(f, "{}", DIGITS[digit]))
}

const DIGITS: [&str; 10] = [
    "\u{1FBF0}",
    "\u{1FBF1}",
    "\u{1FBF2}",
    "\u{1FBF3}",
    "\u{1FBF4}",
    "\u{1FBF5}",
    "\u{1FBF6}",
    "\u{1FBF7}",
    "\u{1FBF8}",
    "\u{1FBF9}",
];