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#[macro_export]
macro_rules! err {
($i: ident, {$($j: ident@$t: ty;)*}) => {
#[derive(Debug)]
enum Errs {
$( $j($t)),*
}
impl std::error::Error for Errs {}
impl core::fmt::Display for Errs {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
match self {
$(
Errs::$j(t) => {
write!(f, "{}", t)
}
),*
}
}
}
#[derive(Debug)]
pub struct $i {
pub description: Option<String>,
pub data: Option<String>,
source: Option<Errs>
}
impl std::error::Error for $i {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self.source {
Some(ref source) => Some(source),
None => None
}
}
}
impl std::convert::From<&str> for $i {
fn from(str: &str) -> Self {
$i {
description: Some(str.to_string()),
data: None,
source: None
}
}
}
impl core::fmt::Display for $i {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
match self.description.as_ref() {
Some(err) => write!(f, "{}", err),
None => write!(f, "An unknown error has occurred!"),
}
}
}
pub type Result<T, E = $i> = std::result::Result<T, E>;
$(
impl std::convert::From<$t> for $i {
fn from(e: $t) -> $i {
$i {
description: Some(String::from(format!("{}", e))),
data: None,
source: Some(Errs::$j(e))
}
}
}
)*
};
}
#[cfg(test)]
mod tests {
use std::fs;
super::err!(TestError,
{
Io@std::io::Error;
}
);
#[test]
#[should_panic]
fn should_fail_wrapper() {
fn should_fail() -> Result<()> {
fs::create_dir("test_fail/test")?;
Ok(())
}
should_fail().unwrap();
}
#[test]
fn should_succeed() -> Result<()> {
fs::create_dir("test_dir")?;
fs::remove_dir_all("test_dir")?;
Ok(())
}
}