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

#[derive(Debug)]
pub enum Error {
    Io(std::io::Error),
    Utf8(std::str::Utf8Error),
    Opts(String),
}

impl std::error::Error for Error {}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::Io(e) => write!(f, "cat: {}", e),
            Error::Utf8(e) => write!(f, "cat: {}", e),
            Error::Opts(s) => write!(f, "cat: unrecognized option '{}'", s),
        }
    }
}

impl From<std::io::Error> for Error {
    fn from(value: std::io::Error) -> Self {
        Error::Io(value)
    }
}

impl From<std::str::Utf8Error> for Error {
    fn from(value: std::str::Utf8Error) -> Self {
        Error::Utf8(value)
    }
}