refactoring

pkg/gui/modes/diffing/diffing.go

@@ -0,0 +1,15 @@
+package diffing
+
+// if ref is blank we're not diffing anything
+type Diffing struct {
+	Ref     string
+	Reverse bool
+}
+
+func New() Diffing {
+	return Diffing{}
+}
+
+func (m *Diffing) Active() bool {
+	return m.Ref != ""
+}