allow getting the current item generically

pkg/commands/branch.go

@@ -16,3 +16,7 @@ type Branch struct {
 func (b *Branch) RefName() string {
 	return b.Name
 }
+
+func (b *Branch) ID() string {
+	return b.RefName()
+}

pkg/commands/commit.go

@@ -28,3 +28,7 @@ func (c *Commit) NameWithSha() string {
 func (c *Commit) RefName() string {
 	return c.Sha
 }
+
+func (c *Commit) ID() string {
+	return c.RefName()
+}

pkg/commands/commit_file.go

@@ -7,3 +7,7 @@ type CommitFile struct {
 	DisplayString string
 	Status        int // one of 'WHOLE' 'PART' 'NONE'
 }
+
+func (f *CommitFile) ID() string {
+	return f.Name
+}

pkg/commands/remote.go

@@ -10,3 +10,7 @@ type Remote struct {
 func (r *Remote) RefName() string {
 	return r.Name
 }
+
+func (r *Remote) ID() string {
+	return r.RefName()
+}

pkg/commands/remote_branch.go

@@ -13,3 +13,7 @@ func (r *RemoteBranch) FullName() string {
 func (r *RemoteBranch) RefName() string {
 	return r.FullName()
 }
+
+func (r *RemoteBranch) ID() string {
+	return r.RefName()
+}

pkg/commands/stash_entry.go

@@ -11,3 +11,7 @@ type StashEntry struct {
 func (s *StashEntry) RefName() string {
 	return fmt.Sprintf("stash@{%d}", s.Index)
 }
+
+func (s *StashEntry) ID() string {
+	return s.RefName()
+}

pkg/commands/tag.go

@@ -8,3 +8,7 @@ type Tag struct {
 func (t *Tag) RefName() string {
 	return t.Name
 }
+
+func (t *Tag) ID() string {
+	return t.RefName()
+}