Add garbage collection feature

* Add `todo gc`, which will delete all archived todos.
* `NextId` will now take the first available id, rather than just the MaxId + 1.

1 files changed, 7 insertions, 0 deletions

diff --git a/todolist/app.go b/todolist/app.go
index 1ab6b20..20a35ef 100644
--- a/todolist/app.go
+++ b/todolist/app.go
@@ -183,6 +183,13 @@ func (a *App) getGroups(input string, todos []*Todo) *GroupedTodos {
 	return grouped
 }
 
+func (a *App) GarbageCollect() {
+	a.Load()
+	a.TodoList.GarbageCollect()
+	a.Save()
+	fmt.Println("Garbage collection complete.")
+}
+
 func (a *App) Load() error {
 	todos, err := a.TodoStore.Load()
 	if err != nil {