Add configurable startup view

src/lib/utils/startup-view.ts

@@ -0,0 +1,57 @@
+import type { StartupView } from "../types";
+
+type RestorableListView = StartupView | "trash";
+
+export type StartupTarget =
+  | { mode: RestorableListView }
+  | { mode: "notebook"; notebookPath: string }
+  | { mode: "tag"; tag: string };
+
+export interface StartupState {
+  startupView: unknown;
+  restoreLastSession: boolean;
+  lastViewMode: unknown;
+  lastNotebook: string | null;
+  lastTag: string | null;
+}
+
+export function normalizeStartupView(value: unknown): StartupView {
+  switch (value) {
+    case "daily":
+    case "quickaccess":
+    case "tasks":
+      return value;
+    default:
+      return "all";
+  }
+}
+
+function restorableListView(value: unknown): RestorableListView | null {
+  switch (value) {
+    case "all":
+    case "daily":
+    case "quickaccess":
+    case "tasks":
+    case "trash":
+      return value;
+    default:
+      return null;
+  }
+}
+
+export function resolveStartupTarget(state: StartupState): StartupTarget {
+  const fallback: StartupTarget = {
+    mode: normalizeStartupView(state.startupView),
+  };
+  if (!state.restoreLastSession) return fallback;
+
+  if (state.lastViewMode === "notebook" && typeof state.lastNotebook === "string") {
+    return { mode: "notebook", notebookPath: state.lastNotebook };
+  }
+  if (state.lastViewMode === "tag" && state.lastTag) {
+    return { mode: "tag", tag: state.lastTag };
+  }
+
+  const listView = restorableListView(state.lastViewMode);
+  return listView ? { mode: listView } : fallback;
+}