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//! Basic error handling mechanisms
use std::error::Error;
use std::fmt;
/// The result type for `GitJournal`
pub type GitJournalResult<T> = Result<T, Box<Error>>;
/// Concrete errors
struct GitJournalError {
description: String,
detail: Option<String>,
cause: Option<Box<Error + Send>>,
}
impl fmt::Display for GitJournalError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.description)?;
if let Some(ref s) = self.detail {
write!(f, ": {}", s)?;
}
Ok(())
}
}
impl fmt::Debug for GitJournalError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self, f)
}
}
impl Error for GitJournalError {
fn description(&self) -> &str {
&self.description
}
#[cfg_attr(feature = "cargo-clippy", allow(let_and_return))]
fn cause(&self) -> Option<&Error> {
self.cause.as_ref().map(|c| {
let e: &Error = &**c;
e
})
}
}
/// Raise an internal error
pub fn error(error: &str, detail: &str) -> Box<Error> {
Box::new(GitJournalError {
description: error.to_string(),
detail: Some(detail.to_string()),
cause: None,
})
}
pub fn bail(error: &fmt::Display) -> Box<Error> {
Box::new(GitJournalError {
description: error.to_string(),
detail: None,
cause: None,
})
}
macro_rules! bail {
($($fmt:tt)*) => (
return Err(::errors::bail(&format_args!($($fmt)*)))
)
}
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