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use std::path::PathBuf;
use std::{error, fmt, io};
#[derive(Debug)]
struct PathError {
path: PathBuf,
err: io::Error,
}
impl fmt::Display for PathError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{} at path {:?}", self.err, self.path)
}
}
impl error::Error for PathError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
self.err.source()
}
}
pub(crate) trait IoResultExt<T> {
fn with_err_path<F, P>(self, path: F) -> Self
where
F: FnOnce() -> P,
P: Into<PathBuf>;
}
impl<T> IoResultExt<T> for Result<T, io::Error> {
fn with_err_path<F, P>(self, path: F) -> Self
where
F: FnOnce() -> P,
P: Into<PathBuf>,
{
self.map_err(|e| {
io::Error::new(
e.kind(),
PathError {
path: path().into(),
err: e,
},
)
})
}
}