Move responder impl's for templates to a macro.

1 files changed, 19 insertions, 15 deletions

diff --git a/src/main.rs b/src/main.rs
index a709cd9..c94dab5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,23 +23,27 @@ struct IndexTemplate<'a> {
     posts: Vec<models::Post>
 }
 
-impl<'a> Responder<'a> for IndexTemplate<'a> {
-    fn respond_to(self, _: &Request) -> Result<Response<'static>, Status> {
-        Response::build()
-            .header(ContentType::HTML)
-            .sized_body(Cursor::new(format!("{}", &self)))
-            .ok()
-    }
+macro_rules! implement_responder_for {
+    // Implement a responder for the given template type
+    //
+    // Seems I can't add the lifetime after the matcher,
+    // like this: `$template_type<'a>`
+    // So it will have to be passed in to the argument at
+    // the macro incovation instead.
+    ($template_type:ty) => (
+        impl<'a> Responder<'a> for $template_type {
+            fn respond_to(self, _: &Request) -> Result<Response<'static>, Status> {
+                Response::build()
+                    .header(ContentType::HTML)
+                    .sized_body(Cursor::new(format!("{}", &self)))
+                    .ok()
+            }
+        }
+    )
 }
 
-impl<'a> Responder<'a> for posts::NewPostTemplate<'a> {
-    fn respond_to(self, _: &Request) -> Result<Response<'static>, Status> {
-        Response::build()
-            .header(ContentType::HTML)
-            .sized_body(Cursor::new(format!("{}", &self)))
-            .ok()
-    }
-}
+implement_responder_for!(IndexTemplate<'a>);
+implement_responder_for!(posts::NewPostTemplate<'a>);
 
 fn get_posts(conn: rocket_blog::DbConn) -> Vec<models::Post> {
     use schema::posts::dsl::*;