Use impl_enum_decodable for SeparatorTactic

src/lib.rs

@@ -48,12 +48,13 @@ use visitor::FmtVisitor;
 
 #[macro_use]
 mod config;
+#[macro_use]
+mod utils;
 mod changes;
 mod visitor;
 mod items;
 mod missed_spans;
 mod lists;
-mod utils;
 mod types;
 mod expr;
 mod imports;
@@ -64,23 +65,6 @@ const SKIP_ANNOTATION: &'static str = "rustfmt_skip";
 
 static mut CONFIG: Option<config::Config> = None;
 
-// Macro for deriving implementations of Decodable for enums
-macro_rules! impl_enum_decodable {
-    ( $e:ident, $( $x:ident ),* ) => {
-        impl Decodable for $e {
-            fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error> {
-                let s = try!(d.read_str());
-                match &*s {
-                    $(
-                        stringify!($x) => Ok($e::$x),
-                    )*
-                    _ => Err(d.error("Bad variant")),
-                }
-            }
-        }
-    };
-}
-
 #[derive(Copy, Clone)]
 pub enum WriteMode {
     Overwrite,

src/lists.rs

@@ -30,18 +30,7 @@ pub enum SeparatorTactic {
     Vertical,
 }
 
-// TODO could use a macro for all these Decodable impls.
-impl Decodable for SeparatorTactic {
-    fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error> {
-        let s = try!(d.read_str());
-        match &*s {
-            "Always" => Ok(SeparatorTactic::Always),
-            "Never" => Ok(SeparatorTactic::Never),
-            "Vertical" => Ok(SeparatorTactic::Vertical),
-            _ => Err(d.error("Bad variant")),
-        }
-    }
-}
+impl_enum_decodable!(SeparatorTactic, Always, Never, Vertical);
 
 // TODO having some helpful ctors for ListFormatting would be nice.
 pub struct ListFormatting<'a> {

src/utils.rs

@@ -47,3 +47,21 @@ pub fn format_visibility(vis: Visibility) -> &'static str {
         Visibility::Inherited => ""
     }
 }
+
+// Macro for deriving implementations of Decodable for enums
+#[macro_export]
+macro_rules! impl_enum_decodable {
+    ( $e:ident, $( $x:ident ),* ) => {
+        impl Decodable for $e {
+            fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error> {
+                let s = try!(d.read_str());
+                match &*s {
+                    $(
+                        stringify!($x) => Ok($e::$x),
+                    )*
+                    _ => Err(d.error("Bad variant")),
+                }
+            }
+        }
+    };
+}