changes

src/export/run.ts

@@ -0,0 +1,37 @@
+import type { Book } from "../model/book";
+import { exportEpub, exportPdf } from "./exporters";
+import { useBook } from "../store/useBook";
+import { isDesktop } from "../ipc";
+
+const DESKTOP_ONLY =
+  'Export runs in the desktop app only — open the window from "pnpm tauri dev" (you are viewing the browser preview).';
+
+const FORMATS: Record<string, { label: string; run: (book: Book) => Promise<void> }> = {
+  pdf: { label: "PDF", run: exportPdf },
+  epub: { label: "EPUB", run: exportEpub },
+};
+
+function nextPaint(): Promise<void> {
+  return new Promise((resolve) =>
+    requestAnimationFrame(() => requestAnimationFrame(() => resolve()))
+  );
+}
+
+export async function runExport(format: "pdf" | "epub"): Promise<void> {
+  const { book, setExporting, setNotice } = useBook.getState();
+  const { label, run } = FORMATS[format];
+  if (!isDesktop) {
+    setNotice(DESKTOP_ONLY);
+    return;
+  }
+  if (!book) return;
+  setExporting(label);
+  await nextPaint();
+  try {
+    await run(book);
+  } catch (e) {
+    setNotice(`${label} export failed: ${e}`);
+  } finally {
+    setExporting(null);
+  }
+}