eyre 0.2.0

Flexible concrete Error Handling and Reporting type built on std::error::Error
Documentation 
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use crate::error::ErrorImpl;
use crate::EyreContext;
use core::fmt::{self, Write};

impl<C> ErrorImpl<(), C>
where
    C: EyreContext,
{
    pub(crate) fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.context.display(self.error(), f)
    }

    pub(crate) fn debug(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.context.debug(self.error(), f)
    }
}

pub(crate) struct Indented<'a, D> {
    pub(crate) inner: &'a mut D,
    pub(crate) number: Option<usize>,
    pub(crate) started: bool,
}

impl<T> Write for Indented<'_, T>
where
    T: Write,
{
    fn write_str(&mut self, s: &str) -> fmt::Result {
        for (i, line) in s.split('\n').enumerate() {
            if !self.started {
                self.started = true;
                match self.number {
                    Some(number) => write!(self.inner, "{: >5}: ", number)?,
                    None => self.inner.write_str("    ")?,
                }
            } else if i > 0 {
                self.inner.write_char('\n')?;
                if self.number.is_some() {
                    self.inner.write_str("       ")?;
                } else {
                    self.inner.write_str("    ")?;
                }
            }

            self.inner.write_str(line)?;
        }

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::alloc::String;

    #[test]
    fn one_digit() {
        let input = "verify\nthis";
        let expected = "    2: verify\n       this";
        let mut output = String::new();

        Indented {
            inner: &mut output,
            number: Some(2),
            started: false,
        }
        .write_str(input)
        .unwrap();

        assert_eq!(expected, output);
    }

    #[test]
    fn two_digits() {
        let input = "verify\nthis";
        let expected = "   12: verify\n       this";
        let mut output = String::new();

        Indented {
            inner: &mut output,
            number: Some(12),
            started: false,
        }
        .write_str(input)
        .unwrap();

        assert_eq!(expected, output);
    }

    #[test]
    fn no_digits() {
        let input = "verify\nthis";
        let expected = "    verify\n    this";
        let mut output = String::new();

        Indented {
            inner: &mut output,
            number: None,
            started: false,
        }
        .write_str(input)
        .unwrap();

        assert_eq!(expected, output);
    }
}