preserving ordering in arrays.

cmd/yamltool/parse.go

@@ -14,13 +14,13 @@ func read(file string) []byte {
 	return data
 }
 
-func parse(data []byte) yaml.MapSlice {
+func parse(data []byte) (yaml.MapSlice, error) {
 	var result yaml.MapSlice
 	decoder := yaml.NewDecoder(bytes.NewReader(data),
 		yaml.UseOrderedMap())
 	err := decoder.Decode(&result)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return result
+	return result, nil
 }