terminator 0.2.0-alpha

Formatter for pretty panics and errors
Documentation 
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use std::error::Error;
use std::fmt::Debug;
use std::fmt::Display;
use std::fmt::Formatter;
use std::fmt::Result;
use std::ops::Deref;
use std::ops::DerefMut;

mod sealed {
    pub trait Sealed {}
    impl<T> Sealed for T where T: super::ErrorCompat {}
}

/// Error shim for use with [`Compat`]
pub trait ErrorCompat: Debug + Display + sealed::Sealed {
    #[doc(hidden)]
    /// The lower-level source of this error, if any
    fn source(&self) -> Option<&(dyn Error + 'static)>;
}

impl ErrorCompat for anyhow::Error {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        self.chain().next()
    }
}

impl ErrorCompat for eyre::Report {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        self.chain().next()
    }
}

/// Newtype wrapper for trait object based error types to implement [`Error`]
#[cfg_attr(not(doc), repr(transparent))]
pub struct Compat<T>(pub T)
where
    T: ErrorCompat;

impl<T: ErrorCompat> Debug for Compat<T> {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        Debug::fmt(&self.0, f)
    }
}

impl<T: ErrorCompat> Display for Compat<T> {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        Display::fmt(&self.0, f)
    }
}

impl<T: ErrorCompat> Error for Compat<T> {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        ErrorCompat::source(&self.0)
    }
}

impl<T: ErrorCompat> AsRef<T> for Compat<T> {
    fn as_ref(&self) -> &T {
        &self.0
    }
}

impl<T: ErrorCompat> AsMut<T> for Compat<T> {
    fn as_mut(&mut self) -> &mut T {
        &mut self.0
    }
}

impl<T: ErrorCompat> Deref for Compat<T> {
    type Target = T;
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T: ErrorCompat> DerefMut for Compat<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}