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    use std::{str, fmt};
    use hash::H96;
    use Error;

    #[derive(Debug, PartialEq, Clone, Hash, Eq, Serializable, Deserializable)]
    pub struct Command(H96);

    impl str::FromStr for Command {
    	type Err = Error;

    	fn from_str(s: &str) -> Result<Self, Self::Err> {
    		if !s.is_ascii() || s.len() > 12 {
    			return Err(Error::InvalidCommand);
    		}

    		let mut result = H96::default();
    		result[..s.len()].copy_from_slice(s.as_ref());
    		Ok(Command(result))
    	}
    }

    impl From<&'static str> for Command {
    	fn from(s: &'static str) -> Self {
    		s.parse().unwrap()
    	}
    }

    impl Command {
    	pub fn len(&self) -> usize {
    		let trailing_zeros = self.0.iter().rev().take_while(|&x| x == &0).count();
    		self.0.len() - trailing_zeros
    	}

    	pub fn is_empty(&self) -> bool {
    		self.0.is_zero()
    	}

    	fn as_string(&self) -> String {
    		String::from_utf8_lossy(&self.0[..self.len()]).to_ascii_lowercase()
    	}
    }

    impl From<Command> for String {
    	fn from(c: Command) -> Self {
    		c.as_string()
    	}
    }

    impl fmt::Display for Command {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		f.write_str(&self.as_string())
    	}
    }

    impl<'a> PartialEq<&'a str> for Command {
    	fn eq(&self, other: &&'a str) -> bool {
    		self.len() == other.len() &&
    		&self.0[..other.len()] == other.as_ref() as &[u8]
    	}
    }

    #[cfg(test)]
    mod tests {
    	use bytes::Bytes;
    	use ser::{serialize, deserialize};
    	use super::Command;

    	#[test]
    	fn test_command_parse() {
    		let command: Command = "version".into();
    		assert_eq!(Command("76657273696f6e0000000000".into()), command);
    	}

    	#[test]
    	fn test_command_to_string() {
    		let command: Command = "version".into();
    		let expected: String = "version".into();
    		assert_eq!(expected, String::from(command));
    	}

    	#[test]
    	fn test_command_serialize() {
    		let expected = "76657273696f6e0000000000".into();
    		let command: Command = "version".into();

    		assert_eq!(serialize(&command), expected);
    	}

    	#[test]
    	fn test_command_deserialize() {
    		let raw: Bytes = "76657273696f6e0000000000".into();
    		let expected: Command = "version".into();

    		assert_eq!(expected, deserialize::<_, Command>(raw.as_ref()).unwrap());
    	}

    	#[test]
    	fn partial_eq_command_str() {
    		let command: Command = "version".into();
    		assert_eq!(command, "version");
    		assert!(command != "ver");
    		assert!(command != "versionx");
    	}

    }

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