1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

use serde::{Deserialize, Serialize};
use std::{error, fmt, io, sync::Arc};

pub struct ResultExpand<T, E>(pub Result<T, E>);
impl<T, E> IntoIterator for ResultExpand<T, E>
where
	T: IntoIterator,
{
	type Item = Result<T::Item, E>;
	type IntoIter = ResultExpandIter<T::IntoIter, E>;
	fn into_iter(self) -> Self::IntoIter {
		ResultExpandIter(self.0.map(IntoIterator::into_iter).map_err(Some))
	}
}
pub struct ResultExpandIter<T, E>(Result<T, Option<E>>);
impl<T, E> Iterator for ResultExpandIter<T, E>
where
	T: Iterator,
{
	type Item = Result<T::Item, E>;
	fn next(&mut self) -> Option<Self::Item> {
		transpose(self.0.as_mut().map(Iterator::next).map_err(Option::take))
	}
}
fn transpose<T, E>(result: Result<Option<T>, Option<E>>) -> Option<Result<T, E>> {
	match result {
		Ok(Some(x)) => Some(Ok(x)),
		Err(Some(e)) => Some(Err(e)),
		Ok(None) | Err(None) => None,
	}
}

#[derive(Clone, Serialize, Deserialize)]
#[serde(transparent)]
pub struct IoError(#[serde(with = "crate::misc_serde")] Arc<io::Error>);
impl PartialEq for IoError {
	fn eq(&self, other: &Self) -> bool {
		self.0.to_string() == other.0.to_string()
	}
}
impl error::Error for IoError {}
impl fmt::Display for IoError {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		fmt::Display::fmt(&self.0, f)
	}
}
impl fmt::Debug for IoError {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		fmt::Debug::fmt(&self.0, f)
	}
}
impl From<io::Error> for IoError {
	fn from(err: io::Error) -> Self {
		Self(Arc::new(err))
	}
}
impl From<IoError> for io::Error {
	fn from(err: IoError) -> Self {
		Arc::try_unwrap(err.0).unwrap()
	}
}