Impl Config for Source to allow merging whole configs; closes #28

2 files changed, 30 insertions, 0 deletions

diff --git a/src/config.rs b/src/config.rs
index 0ff2601..f890461 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -190,3 +190,13 @@ impl Config {
         self.get(key).and_then(Value::into_array)
     }
 }
+
+impl Source for Config {
+    fn clone_into_box(&self) -> Box<Source + Send + Sync> {
+        Box::new((*self).clone())
+    }
+
+    fn collect(&self) -> Result<HashMap<String, Value>> {
+        self.cache.clone().into_table()
+    }
+}
diff --git a/tests/merge.rs b/tests/merge.rs
index f83eef8..d6eb9e0 100644
--- a/tests/merge.rs
+++ b/tests/merge.rs
@@ -25,3 +25,23 @@ fn test_merge() {
     );
     assert_eq!(c.get("place.rating").ok(), Some(4.9));
 }
+
+#[test]
+fn test_merge_whole_config() {
+    let mut c1 = Config::default();
+    let mut c2 = Config::default();
+
+    c1.set("x", 10).unwrap();
+    c2.set("y", 25).unwrap();
+
+    assert_eq!(c1.get("x").ok(), Some(10));
+    assert_eq!(c2.get::<()>("x").ok(), None);
+
+    assert_eq!(c2.get("y").ok(), Some(25));
+    assert_eq!(c1.get::<()>("y").ok(), None);
+
+    c1.merge(c2).unwrap();
+
+    assert_eq!(c1.get("x").ok(), Some(10));
+    assert_eq!(c1.get("y").ok(), Some(25));
+}