Add Error and Result types

examples/google.rs

@@ -1,5 +1,7 @@
+extern crate hyper;
 extern crate inth_oauth2;
 
+use std::io;
 use inth_oauth2::Client;
 
 fn main() {
@@ -15,4 +17,9 @@ fn main() {
     ).unwrap();
 
     println!("{}", auth_uri);
+
+    let mut code = String::new();
+    io::stdin().read_line(&mut code).unwrap();
+
+    client.request_access_token(hyper::Client::new(), &code).unwrap();
 }

src/error.rs

@@ -0,0 +1,26 @@
+use std::result;
+
+use url;
+use hyper;
+
+/// Errors that can occur during authentication flow.
+#[derive(Debug)]
+pub enum Error {
+    Url(url::ParseError),
+    Hyper(hyper::Error),
+}
+
+/// Result type returned from authentication flow methods.
+pub type Result<T> = result::Result<T, Error>;
+
+impl From<url::ParseError> for Error {
+    fn from(err: url::ParseError) -> Error {
+        Error::Url(err)
+    }
+}
+
+impl From<hyper::Error> for Error {
+    fn from(err: hyper::Error) -> Error {
+        Error::Hyper(err)
+    }
+}

src/lib.rs

@@ -7,3 +7,6 @@ mod client;
 
 pub use token::Token;
 mod token;
+
+pub use error::{Error, Result};
+mod error;