Add builder API to Config

1 files changed, 10 insertions, 1 deletions

diff --git a/src/source.rs b/src/source.rs
index 5db362e..c8a0e83 100644
--- a/src/source.rs
+++ b/src/source.rs
@@ -1,10 +1,19 @@
 use error::*;
+use std::fmt::Debug;
 use value::Value;
 use std::collections::HashMap;
 
 /// Describes a generic _source_ of configuration properties.
-pub trait Source {
+pub trait Source: Debug {
+    fn clone_into_box(&self) -> Box<Source + Send + Sync>;
+
     /// Collect all configuration properties available from this source and return
     /// a HashMap.
     fn collect(&self) -> Result<HashMap<String, Value>>;
 }
+
+impl Clone for Box<Source + Send + Sync> {
+    fn clone(&self) -> Box<Source + Send + Sync> {
+        self.clone_into_box()
+    }
+}