add root.equals and todo.equals

pttodo/root.go

@@ -6,6 +6,20 @@ type Root struct {
 	Done      []Todo
 }
 
+func (root Root) Equals(other Root) bool {
+	for i, slice := range [][2][]Todo{
+		[2][]Todo{root.Todo, other.Todo},
+		[2][]Todo{root.Scheduled, other.Scheduled},
+		[2][]Todo{root.Done, other.Done},
+	} {
+		_ = i
+		if !equalTodoSlices(slice[0], slice[1]) {
+			return false
+		}
+	}
+	return true
+}
+
 func (root *Root) MoveScheduledToTodo() {
 	for i := len(root.Scheduled) - 1; i >= 0; i-- {
 		if root.Scheduled[i].Triggered() {