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use std::error::Error;
use std::fmt;
pub(crate) trait ChainError {
fn chain<F>(self, cause: F) -> Self
where
F: Error + Send + Sync + 'static;
}
pub(crate) trait ResultChainExt<T> {
fn chain<C>(self, chainable: C) -> Result<T, C>
where
C: ChainError;
fn chain_with<F, C>(self, chainable: F) -> Result<T, C>
where
F: FnOnce() -> C,
C: ChainError;
}
impl<T, E> ResultChainExt<T> for Result<T, E>
where
E: Error + Send + Sync + 'static,
{
fn chain<C>(self, chainable: C) -> Result<T, C>
where
C: ChainError,
{
self.map_err(|e| chainable.chain(e))
}
fn chain_with<F, C>(self, chainable: F) -> Result<T, C>
where
F: FnOnce() -> C,
C: ChainError,
{
self.map_err(|e| chainable().chain(e))
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
#[non_exhaustive]
pub enum FixtureKind {
Walk,
CopyFile,
WriteFile,
CreateDir,
Cleanup,
Symlink,
}
impl fmt::Display for FixtureKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
FixtureKind::Walk => write!(f, "Failed when walking the source tree,"),
FixtureKind::CopyFile => write!(f, "Failed when copying a file."),
FixtureKind::WriteFile => write!(f, "Failed when writing to a file."),
FixtureKind::CreateDir => write!(f, "Failed when creating a directory."),
FixtureKind::Cleanup => write!(f, "Failed to cleanup fixture."),
FixtureKind::Symlink => write!(f, "Failed when symlinking to the target."),
}
}
}
#[derive(Debug)]
pub struct FixtureError {
kind: FixtureKind,
cause: Option<Box<dyn Error + Send + Sync + 'static>>,
}
impl FixtureError {
pub fn new(kind: FixtureKind) -> Self {
Self { kind, cause: None }
}
pub fn kind(&self) -> FixtureKind {
self.kind
}
}
impl Error for FixtureError {
fn description(&self) -> &str {
"Failed to initialize fixture"
}
fn cause(&self) -> Option<&dyn Error> {
self.cause.as_ref().map(|c| {
let c: &dyn Error = c.as_ref();
c
})
}
}
impl fmt::Display for FixtureError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.cause {
Some(ref cause) => write!(
f,
"Failed to initialize fixture: {}\nCause: {}",
self.kind, cause
),
None => write!(f, "Failed to initialize fixture: {}", self.kind),
}
}
}
impl ChainError for FixtureError {
fn chain<F>(mut self, cause: F) -> Self
where
F: Error + Send + Sync + 'static,
{
self.cause = Some(Box::new(cause));
self
}
}