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() {

pttodo/root_test.go

@@ -24,6 +24,8 @@ func TestJSONRoot(t *testing.T) {
 		t.Fatal(err)
 	} else if fmt.Sprint(root) != fmt.Sprint(root2) {
 		t.Fatal(root, root2)
+	} else if !root.Equals(root2) {
+		t.Fatal(root2)
 	}
 }
 
@@ -95,6 +97,8 @@ func TestRootMoveScheduledToTodo(t *testing.T) {
 			got.MoveScheduledToTodo()
 			if fmt.Sprintf("%+v", got) != fmt.Sprintf("%+v", want) {
 				t.Fatalf("want \n\t%+v, got \n\t%+v", want, got)
+			} else if !got.Equals(want) {
+				t.Fatalf("want \n\t%+v, got \n\t%+v", want, got)
 			}
 		})
 	}
@@ -144,6 +148,8 @@ todo:
 	root0.MergeIn(root1)
 	if fmt.Sprintf("%+v", root0) != fmt.Sprintf("%+v", rootWant) {
 		t.Fatalf("want \n\t%+v, got \n\t%+v", rootWant, root0)
+	} else if !root0.Equals(rootWant) {
+		t.Fatalf("want \n\t%+v, got \n\t%+v", rootWant, root0)
 	}
 }
 

pttodo/todo.go

@@ -43,3 +43,37 @@ func (todo *Todo) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	alt := (*Alt)(todo)
 	return unmarshal(alt)
 }
+
+func (todo Todo) Equals(other Todo) bool {
+	if !equalTodoSlices(todo.Subtasks, other.Subtasks) {
+		return false
+	}
+	if todo.TS != other.TS {
+		return false
+	}
+	if todo.Tags != other.Tags {
+		return false
+	}
+	if todo.Schedule != other.Schedule {
+		return false
+	}
+	if todo.Details != other.Details {
+		return false
+	}
+	if todo.Todo != other.Todo {
+		return false
+	}
+	return true
+}
+
+func equalTodoSlices(a, b []Todo) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if !a[i].Equals(b[i]) {
+			return false
+		}
+	}
+	return true
+}