use std::fmt;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
IoError(std::io::Error),
BincodeError(bincode::Error),
JsonError(serde_json::Error),
ChronoError(chrono::ParseError),
BadMagic,
BadVersion,
DateParseError,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&Error::IoError(ref err) => write!(f, "io error: {}", err),
&Error::BincodeError(ref err) => write!(f, "bincode error: {}", err),
&Error::JsonError(ref err) => write!(f, "json error: {}", err),
&Error::ChronoError(ref err) => write!(f, "chrono error: {}", err),
&Error::BadMagic => write!(f, "bad magic number"),
&Error::BadVersion => write!(f, "bad version number"),
&Error::DateParseError => write!(f, "invalid date format"),
}
}
}
macro_rules! impl_error {
($external_error:ty, $prophet_error:expr) => (
impl From<$external_error> for Error {
fn from(e: $external_error) -> Error {
$prophet_error(e)
}
}
);
}
impl_error!(std::io::Error, Error::IoError);
impl_error!(bincode::Error, Error::BincodeError);
impl_error!(serde_json::Error, Error::JsonError);
impl_error!(chrono::ParseError, Error::ChronoError);