Merge pull request rust-bitcoin#80 from alekseysidorov/improve-networ…

…k-constant

Implement `FromStr` for Network constant

src/macros.rs

@@ -105,6 +105,17 @@ macro_rules! user_enum {
             }
         }
 
+        impl ::std::str::FromStr for $name {
+            type Err = ::serde::de::value::Error;
+            #[inline]
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                match s {
+                    $($txt => Ok($name::$elem)),*,
+                    _ => Err(::serde::de::Error::syntax(stringify!(s)))
+                }
+            }
+        }
+
         impl ::serde::Deserialize for $name {
             #[inline]
             fn deserialize<D>(d: &mut D) -> Result<$name, D::Error>

src/network/constants.rs

@@ -84,5 +84,15 @@ mod tests {
     let bad: Result<Network, _> = deserialize("fakenet".as_bytes());
     assert!(bad.is_err());
   }
+
+  #[test]
+  fn string_test() {
+      assert_eq!(Network::Bitcoin.to_string(), "bitcoin");
+      assert_eq!(Network::Testnet.to_string(), "testnet");
+
+      assert_eq!("bitcoin".parse(), Ok(Network::Bitcoin));
+      assert_eq!("testnet".parse(), Ok(Network::Testnet));
+      assert!("fakenet".parse::<Network>().is_err());
+  }
 }