Merge #398: Implement LowerHex and Display for Message

a209836 Implement LowerHex and Display for Message (Tobin Harding)

Pull request description:

  Implement `fmt::LowerHex` for `Message`. Implement `Display` by calling `LowerHex`.

  Resolves: #251

ACKs for top commit:
  apoelstra:
    ACK a209836

Tree-SHA512: 64eeafc57ea2814108228d8427cd650076eb3cbb85ae14a7c5a6f39f5e20ca9b83b4ccc27c201668fd57a34fde0a37be4098aa5c602208a81a2018293b40b64d

Author: apoelstra

src/lib.rs

@@ -324,6 +324,21 @@ impl<T: ThirtyTwoByteHash> From<T> for Message {
     }
 }
 
+impl fmt::LowerHex for Message {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        for byte in self.0.iter() {
+            write!(f, "{:02x}", byte)?;
+        }
+        Ok(())
+    }
+}
+
+impl fmt::Display for Message {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::LowerHex::fmt(self, f)
+    }
+}
+
 /// An ECDSA error
 #[derive(Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Debug)]
 pub enum Error {