use std::fmt;

pub struct Hexlify<'b>(pub &'b [u8]);

impl<'a> fmt::LowerHex for Hexlify<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        for byte in self.0.iter() {
            write!(f, "{:02x}", byte)?;
        }
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_hexlify() {
        let data = b"\x5a\x6b\x23\x4f\xa3\x7f\x9e";
        let result = "5a6b234fa37f9e";
        assert_eq!(format!("{:x}", Hexlify(data)), result);
    }
}