1use crate::utils::Context;
2
3use std::{error::Error as StdError, fmt, io};
4
5/// Wrap `std::io::Error` with additional message
6///
7/// Keeps the original error kind and stores the original I/O error as `source`.
8impl<T> Context for Result<T, std::io::Error> {
9 fn context(self, message: impl Fn() -> String) -> Self {
10 self.map_err(|e: Error| VerboseError::wrap(source:e, message()))
11 }
12}
13
14#[derive(Debug)]
15pub(crate) struct VerboseError {
16 source: io::Error,
17 message: String,
18}
19
20impl VerboseError {
21 pub(crate) fn wrap(source: io::Error, message: impl Into<String>) -> io::Error {
22 io::Error::new(
23 source.kind(),
24 error:VerboseError {
25 source,
26 message: message.into(),
27 },
28 )
29 }
30}
31
32impl fmt::Display for VerboseError {
33 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
34 write!(f, "{}", self.message)
35 }
36}
37
38impl StdError for VerboseError {
39 fn source(&self) -> Option<&(dyn StdError + 'static)> {
40 Some(&self.source)
41 }
42}
43