dok 0.2.0

A Docker Registry CLI
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use std::error;
use std::fmt;
use std::io;
use std::result;

use reqwest;
use serde_json;

pub type DokResult<T> = result::Result<T, DokError>;

#[derive(Debug)]
pub enum DokError {
    Error(String),
    Io(io::Error),
    Json(serde_json::Error),
    Http(reqwest::Error),
}

impl DokError {
    pub fn new(desc: &str) -> Self {
        DokError::Error(desc.to_string())
    }
}

impl fmt::Display for DokError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            DokError::Error(ref e) => write!(f, "[Dok] {}", e),
            DokError::Io(ref e) => write!(f, "[IO] {}", e),
            DokError::Json(ref e) => write!(f, "[JSON] {}", e),
            DokError::Http(ref e) => write!(f, "[HTTP] {}", e),
        }
    }
}

impl error::Error for DokError {
    fn description(&self) -> &str {
        match *self {
            DokError::Error(ref e) => e,
            DokError::Io(ref e) => e.description(),
            DokError::Json(ref e) => e.description(),
            DokError::Http(ref e) => e.description(),
        }
    }

    fn cause(&self) -> Option<&error::Error> {
        match *self {
            DokError::Error(_) => None,
            DokError::Io(ref e) => Some(e),
            DokError::Json(ref e) => Some(e),
            DokError::Http(ref e) => Some(e),
        }
    }
}

impl From<io::Error> for DokError {
    fn from(e: io::Error) -> DokError {
        DokError::Io(e)
    }
}

impl From<serde_json::Error> for DokError {
    fn from(e: serde_json::Error) -> DokError {
        DokError::Json(e)
    }
}

impl From<reqwest::Error> for DokError {
    fn from(e: reqwest::Error) -> DokError {
        DokError::Http(e)
    }
}