plumbing: add IsDelta method to ObjectType

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

1 files changed, 2 insertions, 6 deletions

diff --git a/plumbing/format/packfile/delta_selector.go b/plumbing/format/packfile/delta_selector.go
index 4bee6d3..efcbd53 100644
--- a/plumbing/format/packfile/delta_selector.go
+++ b/plumbing/format/packfile/delta_selector.go
@@ -96,9 +96,7 @@ func (dw *deltaSelector) fixAndBreakChains(objectsToPack []*ObjectToPack) error
 }
 
 func (dw *deltaSelector) fixAndBreakChainsOne(objectsToPack map[plumbing.Hash]*ObjectToPack, otp *ObjectToPack) error {
-	isDelta := otp.Object.Type() == plumbing.OFSDeltaObject ||
-		otp.Object.Type() == plumbing.REFDeltaObject
-	if !isDelta {
+	if !otp.Object.Type().IsDelta() {
 		return nil
 	}
 
@@ -141,9 +139,7 @@ func (dw *deltaSelector) restoreOriginal(otp *ObjectToPack) error {
 		return nil
 	}
 
-	isDelta := otp.Object.Type() == plumbing.OFSDeltaObject ||
-		otp.Object.Type() == plumbing.REFDeltaObject
-	if !isDelta {
+	if !otp.Object.Type().IsDelta() {
 		return nil
 	}