+import { derived, writable } from 'svelte/store';
+import type { Readable, Writable } from 'svelte/store';
+
+export type Actions = {
+ topic?: TopicAction
+};
+
+export type TopicAction = {
+ id: string
+};
+
+/*
+ * This is a store to set the actions in the top header.
+ */
+
+const actions: Writable<Actions> = writable({});
+
+export const enableTopicActions = (id: string) => {
+
+ actions.update((actionsValue: Actions): Actions => {
+
+ actionsValue.topic = {
+ id
+ };
+ return actionsValue;
+ });
+};
+
+export const disableTopicActions = () => {
+
+ actions.update((actionsValue): Actions => {
+
+ delete actionsValue.topic;
+ return actionsValue;
+ });
+};
+
+export const topicActions: Readable<TopicAction> = derived(
+ actions,
+ ($actions) => $actions.topic
+);