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use std::io;

#[derive(Debug, ErrorChain)]
#[cfg_attr(not(feature = "backtrace"), error_chain(backtrace = "false"))]
pub enum ErrorKind {
    // generic error string, required by derive_error_chain
    Msg(String),
    #[error_chain(custom)]
    #[error_chain(description = r#"|_| "Parsing Error""#)]
    #[error_chain(display = r#"|l| write!(f, "Error parsing line: '{}'", l)"#)]
    LineParse(String),
    #[error_chain(foreign)]
    ParseFormatter(::regex::Error),
    #[error_chain(foreign)]
    Io(::std::io::Error),
    #[error_chain(foreign)]
    EnvVar(::std::env::VarError),
}

impl Error {
    pub fn not_found(&self) -> bool {
        if let &ErrorKind::Io(ref io_error) = self.kind() {
            return io_error.kind() == io::ErrorKind::NotFound;
        }
        false
    }
}