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use core::fmt;

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Debug)]
pub enum Error {
    NotFound,
    InvalidTarget(String),
    IoError(std::io::Error),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Error::NotFound => write!(f, "path not found"),
            Error::InvalidTarget(reason) => write!(f, "{}", reason),
            Error::IoError(e) => e.fmt(f),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match *self {
            Error::NotFound => None,
            Error::InvalidTarget(_) => None,
            Error::IoError(ref e) => Some(e),
        }
    }
}

impl From<std::io::Error> for Error {
    fn from(err: std::io::Error) -> Error {
        Error::IoError(err)
    }
}