feat: package Pi extensions as Bun workspaces

extensions/todo-herdr/src/auto-clear.ts

@@ -0,0 +1,49 @@
+import type { TaskState } from "./state.ts";
+
+export const TODO_AUTO_CLEAR_DELAY_MS = 10_000;
+
+export interface CompletedTaskAutoClear {
+  sync(forceRestart?: boolean): void;
+  cancel(): void;
+}
+
+export function createCompletedTaskAutoClear(
+  state: TaskState,
+  tryClear: () => boolean,
+  delayMs = TODO_AUTO_CLEAR_DELAY_MS,
+): CompletedTaskAutoClear {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  let scheduledKey: string | undefined;
+
+  const completionKey = () => {
+    const tasks = state.list();
+    if (tasks.length === 0 || tasks.some((task) => task.status !== "done")) return undefined;
+    return tasks.map((task) => `${task.id}:${task.status}`).join("|");
+  };
+
+  const cancel = () => {
+    if (timer !== undefined) clearTimeout(timer);
+    timer = undefined;
+    scheduledKey = undefined;
+  };
+
+  const sync = (forceRestart = false) => {
+    const nextKey = completionKey();
+    if (nextKey === undefined) {
+      cancel();
+      return;
+    }
+    if (!forceRestart && timer !== undefined && scheduledKey === nextKey) return;
+
+    cancel();
+    scheduledKey = nextKey;
+    timer = setTimeout(() => {
+      timer = undefined;
+      if (completionKey() !== scheduledKey) return;
+      if (!tryClear()) sync();
+    }, Math.max(0, delayMs));
+    timer.unref?.();
+  };
+
+  return { sync, cancel };
+}