1 files changed, 8 insertions, 2 deletions
diff --git a/objects/id.go b/objects/id.go
index 224b3cd..047fada 100644
--- a/objects/id.go
+++ b/objects/id.go
@@ -39,7 +39,7 @@ type ObjectId struct {
 	Sum  []byte
 }
 
-func (oid ObjectId) wellformed() bool {
+func (oid ObjectId) Wellformed() bool {
 	return oid.Algo.checkAlgo() && len(oid.Sum) == oid.Algo.sumLength()
 }
 
@@ -61,13 +61,19 @@ func ParseObjectId(s string) (oid ObjectId, err error) {
 		return
 	}
 
-	if !oid.wellformed() {
+	if !oid.Wellformed() {
 		err = errors.New("Object ID is malformed")
 	}
 
 	return
 }
 
+// Set implements flag.Value for ObjectId
+func (oid *ObjectId) Set(s string) (err error) {
+	*oid, err = ParseObjectId(s)
+	return
+}
+
 func MustParseObjectId(s string) ObjectId {
 	id, err := ParseObjectId(s)
 	if err != nil {