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69 lines
1.3 KiB
69 lines
1.3 KiB
use std::{
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error,
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fmt,
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};
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#[derive(Debug)]
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pub struct PrefixedError<T>
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where T: error::Error + 'static
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{
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prefix: String,
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internal: T,
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}
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impl<T> std::error::Error for PrefixedError<T>
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where T: error::Error + 'static
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{
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fn source(&self) -> Option<&(dyn error::Error + 'static)>
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{
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Some(&self.internal)
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}
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}
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impl<T> std::fmt::Display for PrefixedError<T>
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where T: error::Error + 'static
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "{}: {}", self.prefix, self.internal)
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}
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}
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impl<T> PrefixedError<T>
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where T: error::Error + 'static
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{
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#[inline] pub fn into_inner(self) -> T
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{
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self.internal
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}
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}
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pub trait ErrorExt: Sized + error::Error
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{
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fn with_prefix(self, msg: impl ToString) -> PrefixedError<Self>;
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}
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pub trait ResultExt<T,E>: Sized
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where E: error::Error + 'static
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{
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fn with_prefix(self, msg: impl ToString) -> Result<T,PrefixedError<E>>;
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}
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impl<T> ErrorExt for T
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where T: error::Error + 'static
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{
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#[inline] fn with_prefix(self, msg: impl ToString) -> PrefixedError<Self>
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{
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PrefixedError {
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prefix: msg.to_string(),
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internal: self
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}
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}
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}
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impl<T,E> ResultExt<T,E> for Result<T,E>
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where E: error::Error + 'static
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{
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#[inline] fn with_prefix(self, msg: impl ToString) -> Result<T,PrefixedError<E>>
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{
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self.map_err(|e| e.with_prefix(msg))
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}
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}
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