1 files changed, 45 insertions, 0 deletions
diff --git a/compare.go b/compare.go
new file mode 100644
index 0000000..340206d
--- /dev/null
+++ b/compare.go
@@ -0,0 +1,45 @@
+package gitpb
+
+type RepoTag struct {
+	r *Repo
+	t *GitTag
+}
+
+func (r *Repo) NewCompareTag(refname string) *RepoTag {
+	t := r.IfRefExists(refname)
+	if t == nil {
+		return nil
+	}
+	rt := new(RepoTag)
+	rt.r = r
+	rt.t = t
+	return rt
+}
+
+// if t1 is user branch, and t2 is devel branch, true if 0
+func (t1 *RepoTag) LessThan(t2 *RepoTag) bool {
+	count, err := t1.r.CountDiffObjects(t1.t.Refname, t2.t.Refname)
+	if err != nil {
+		return false
+	}
+	if count == 0 {
+		return true
+	}
+	return false
+}
+
+func (t1 *RepoTag) Equal(t2 *RepoTag) bool {
+	return false
+}
+
+// if t1 is user branch, and t2 is devel branch, true if 0
+func (t1 *RepoTag) GreaterThan(t2 *RepoTag) bool {
+	count, err := t1.r.CountDiffObjects(t2.t.Refname, t1.t.Refname)
+	if err != nil {
+		return false
+	}
+	if count == 0 {
+		return true
+	}
+	return false
+}