1 unstable release
0.1.0 | Jul 20, 2023 |
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#13 in #utility-macro
6KB
wrapping_error
An anti-boilerplate package for errors that wrap errors.
This package only exports one item: the wrapping_error
macro.
Using the wrapping_error
macro, you can write this:
use std::{env::VarError, io};
use wrapping_error::wrapping_error;
wrapping_error!(pub(crate) AppDataError {
Var(VarError) => "could not get $HOME environment variable",
Io(io::Error) => "failed to read/write app data",
Postcard(postcard::Error) => "failed to serialize/deserialize app data",
});
and get this:
use std::{fmt, error, env::VarError, io};
#[derive(Debug)]
pub(crate) enum AppDataError {
Var(VarError),
Io(io::Error),
Postcard(postcard::Error),
}
impl fmt::Display for AppDataError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Self::Var(..) => write!(f, "could not get $HOME environment variable"),
Self::Io(..) => write!(f, "failed to read/write app data"),
Self::Postcard(..) => write!(f, "failed to serialize/deserialize app data"),
ref err => err.fmt(f),
}
}
}
impl error::Error for AppDataError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match *self {
ref err => Some(err),
}
}
}
impl From<VarError> for AppDataError {
fn from(err: VarError) -> Self {
Self::Var(err)
}
}
impl From<io::Error> for AppDataError {
fn from(err: io::Error) -> Self {
Self::Io(err)
}
}
impl From<postcard::Error> for AppDataError {
fn from(err: postcard::Error) -> Self {
Self::Postcard(err)
}
}