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use std::{error, fmt, io, result}; use std::error::Error as E; use chrono::format::ParseError; pub type Result<T> = result::Result<T, Error>; #[derive(Debug)] pub enum Error { Parse(String), Chrono(ParseError), Io(io::Error), Custom(Box<error::Error>), } impl fmt::Display for Error { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { fmt.write_str(self.description()) } } impl error::Error for Error { fn description(&self) -> &str { use self::Error::*; match self { &Parse(_) => "error while parsing", &Chrono(_) => "error while parsing time strings", &Io(_) => "error during input/output", &Custom(ref e) => e.description(), } } fn cause(&self) -> Option<&error::Error> { use self::Error::*; match self { &Parse(ref _e) => None, &Chrono(ref e) => Some(e), &Io(ref e) => Some(e), &Custom(ref e) => e.cause(), } } } impl From<ParseError> for Error { fn from(err: ParseError) -> Error { Error::Chrono(err) } } impl From<io::Error> for Error { fn from(err: io::Error) -> Error { Error::Io(err) } }