some more standardisation for diffing

pkg/commands/branch.go

@@ -12,3 +12,7 @@ type Branch struct {
 	UpstreamName string
 	Head         bool
 }
+
+func (b *Branch) RefName() string {
+	return b.Name
+}

pkg/commands/commit.go

@@ -24,3 +24,7 @@ func (c *Commit) ShortSha() string {
 func (c *Commit) NameWithSha() string {
 	return fmt.Sprintf("%s %s", c.Sha[:7], c.Name)
 }
+
+func (c *Commit) RefName() string {
+	return c.Sha
+}

pkg/commands/remote.go

@@ -6,3 +6,7 @@ type Remote struct {
 	Urls     []string
 	Branches []*RemoteBranch
 }
+
+func (r *Remote) RefName() string {
+	return r.Name
+}

pkg/commands/remote_branch.go

@@ -9,3 +9,7 @@ type RemoteBranch struct {
 func (r *RemoteBranch) FullName() string {
 	return r.RemoteName + "/" + r.Name
 }
+
+func (r *RemoteBranch) RefName() string {
+	return r.FullName()
+}

pkg/commands/tag.go

@@ -4,3 +4,7 @@ package commands
 type Tag struct {
 	Name string
 }
+
+func (t *Tag) RefName() string {
+	return t.Name
+}