2 files changed, 40 insertions, 3 deletions
diff --git a/plumbing/reference.go b/plumbing/reference.go
index deb5067..eef11e8 100644
--- a/plumbing/reference.go
+++ b/plumbing/reference.go
@@ -204,6 +204,21 @@ func (r *Reference) Strings() [2]string {
 }
 
 func (r *Reference) String() string {
-	s := r.Strings()
-	return fmt.Sprintf("%s %s", s[1], s[0])
+	ref := ""
+	switch r.Type() {
+	case HashReference:
+		ref = r.Hash().String()
+	case SymbolicReference:
+		ref = symrefPrefix + r.Target().String()
+	default:
+		return ""
+	}
+
+	name := r.Name().String()
+	var v strings.Builder
+	v.Grow(len(ref) + len(name) + 1)
+	v.WriteString(ref)
+	v.WriteString(" ")
+	v.WriteString(name)
+	return v.String()
 }
diff --git a/plumbing/reference_test.go b/plumbing/reference_test.go
index b3ccf53..e69076f 100644
--- a/plumbing/reference_test.go
+++ b/plumbing/reference_test.go
@@ -1,6 +1,10 @@
 package plumbing
 
-import . "gopkg.in/check.v1"
+import (
+	"testing"
+
+	. "gopkg.in/check.v1"
+)
 
 type ReferenceSuite struct{}
 
@@ -98,3 +102,21 @@ func (s *ReferenceSuite) TestIsTag(c *C) {
 	r := ReferenceName("refs/tags/v3.1.")
 	c.Assert(r.IsTag(), Equals, true)
 }
+
+func benchMarkReferenceString(r *Reference, b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		r.String()
+	}
+}
+
+func BenchmarkReferenceStringSymbolic(b *testing.B) {
+	benchMarkReferenceString(NewSymbolicReference("v3.1.1", "refs/tags/v3.1.1"), b)
+}
+
+func BenchmarkReferenceStringHash(b *testing.B) {
+	benchMarkReferenceString(NewHashReference("v3.1.1", NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5")), b)
+}
+
+func BenchmarkReferenceStringInvalid(b *testing.B) {
+	benchMarkReferenceString(&Reference{}, b)
+}