bencode: implement debug on the inner structs

src/bencode/mod.rs

@@ -59,30 +59,14 @@ impl fmt::Debug for Object {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             Object::Int(num) => write!(f, "{}", num),
-            Object::Bytes(ref bytes) => {
-                match str::from_utf8(bytes) {
-                    Ok(s) => write!(f, "{}", s),
-                    Err(_) => {
-                        for &b in bytes.iter() {
-                            write!(f, "{:X}", b)?;
-                        }
-                        Ok(())
-                    }
-                }
-            }
-            Object::List(ref list) => {
-                f.debug_list().entries(list.iter()).finish()
-            }
-            Object::Dict(ref dict) => {
-                f.debug_map()
-                 .entries(dict.iter().map(|(k, v)| (k.clone(), v)))
-                 .finish()
-            }
+            Object::Bytes(ref bytes) => bytes.fmt(f),
+            Object::List(ref list) => list.fmt(f),
+            Object::Dict(ref dict) => dict.fmt(f),
         }
     }
 }
 
-#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+#[derive(Clone, Eq, Ord, PartialEq, PartialOrd)]
 pub struct Bytes(Vec<u8>);
 
 impl Bytes {
@@ -113,7 +97,23 @@ impl DerefMut for Bytes {
     }
 }
 
-#[derive(Clone, Debug, Eq, PartialEq)]
+impl fmt::Debug for Bytes {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match str::from_utf8(&self.0) {
+            Ok(s) => write!(f, "\"{}\"", s),
+            Err(_) => {
+                write!(f, "\"")?;
+                for &b in self.0.iter() {
+                    write!(f, "{:x}", b)?;
+                }
+                write!(f, "\"")?;
+                Ok(())
+            }
+        }
+    }
+}
+
+#[derive(Clone, Eq, PartialEq)]
 pub struct List(Vec<Object>);
 
 impl List {
@@ -140,7 +140,13 @@ impl DerefMut for List {
     }
 }
 
-#[derive(Clone, Debug, Eq, PartialEq)]
+impl fmt::Debug for List {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_list().entries(self.iter()).finish()
+    }
+}
+
+#[derive(Clone, Eq, PartialEq)]
 pub struct Dict(BTreeMap<Bytes, Object>);
 
 impl Dict {
@@ -195,6 +201,14 @@ impl DerefMut for Dict {
     }
 }
 
+impl fmt::Debug for Dict {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_map()
+         .entries(self.iter())
+         .finish()
+    }
+}
+
 // convertion utilities
 
 // int