plumbing: add IsDelta method to ObjectType

ObjectType.IsDelta is a convenience function to match both
offset and reference delta types.

1 files changed, 6 insertions, 0 deletions

diff --git a/plumbing/object.go b/plumbing/object.go
index 63396f0..2655dee 100644
--- a/plumbing/object.go
+++ b/plumbing/object.go
@@ -82,6 +82,12 @@ func (t ObjectType) Valid() bool {
 	return t >= CommitObject && t <= REFDeltaObject
 }
 
+// IsDelta returns true for any ObjectTyoe that represents a delta (i.e.
+// REFDeltaObject or OFSDeltaObject).
+func (t ObjectType) IsDelta() bool {
+	return t == REFDeltaObject || t == OFSDeltaObject
+}
+
 // ParseObjectType parses a string representation of ObjectType. It returns an
 // error on parse failure.
 func ParseObjectType(value string) (typ ObjectType, err error) {