use std::error::Error;

use std::fmt;

/// The error type returned on unsupported platforms.

///

/// On unsupported platforms, all operations will fail with an `io::Error` with

/// a kind `io::ErrorKind::Unsupported` and an `UnsupportedPlatformError` error as the inner error.

/// While you *could* check the inner error, it's probably simpler just to check

/// `xattr::SUPPORTED_PLATFORM`.

///

/// This error mostly exists for pretty error messages.

#[derive(Copy, Clone, Debug)]

pub struct UnsupportedPlatformError;

impl Error for UnsupportedPlatformError {

    fn description(&self) -> &str {

        "unsupported platform"

    }

}

impl fmt::Display for UnsupportedPlatformError {

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

        write!(

            f,

            "unsupported platform, please file a bug at `https://github.com/Stebalien/xattr'"

        )

    }

}