✨ feat: Persist main window size, position, and maximization

src/main/ipc/handlers.ts

@@ -108,7 +108,9 @@ const handlers = {
   "debug:repoFlush": (name) => guard(async () => debug.repoFlush(name)),
   "debug:openWindow": () => guard(async () => openDebugWindow()),
 } satisfies {
-  [C in IpcRequestChannel]: (...args: Parameters<IpcRequests[C]>) => Promise<ReturnType<IpcRequests[C]>>;
+  [C in IpcRequestChannel]: (
+    ...args: Parameters<IpcRequests[C]>
+  ) => Promise<ReturnType<IpcRequests[C]>>;
 };
 
 export function registerIpcHandlers(): void {
@@ -121,7 +123,5 @@ function register<C extends IpcRequestChannel>(channel: C): void {
   const handler = handlers[channel] as (
     ...args: Parameters<IpcRequests[C]>
   ) => Promise<ReturnType<IpcRequests[C]>>;
-  ipcMain.handle(channel, (_event, ...args) =>
-    handler(...(args as Parameters<IpcRequests[C]>)),
-  );
+  ipcMain.handle(channel, (_event, ...args) => handler(...(args as Parameters<IpcRequests[C]>)));
 }

src/main/windowState.ts

@@ -0,0 +1,65 @@
+import { app, screen, type BrowserWindow, type Rectangle } from "electron";
+import { join } from "node:path";
+import { readFileSync } from "node:fs";
+import { writeFileAtomicSync } from "./lib/atomicFile";
+
+type Bounds = Rectangle & { maximized: boolean };
+
+const path = () => join(app.getPath("userData"), "window-state.json");
+
+function read(): Partial<Bounds> | null {
+  try {
+    return JSON.parse(readFileSync(path(), "utf8")) as Partial<Bounds>;
+  } catch {
+    return null;
+  }
+}
+
+function onScreen(b: Rectangle): boolean {
+  return screen.getAllDisplays().some((d) => {
+    const w = d.workArea;
+    return (
+      b.x < w.x + w.width && b.x + b.width > w.x && b.y < w.y + w.height && b.y + b.height > w.y
+    );
+  });
+}
+
+export function restoreBounds(): { bounds?: Rectangle; maximized: boolean } {
+  const saved = read();
+  if (
+    saved &&
+    saved.width &&
+    saved.height &&
+    saved.x != null &&
+    saved.y != null &&
+    onScreen({ x: saved.x, y: saved.y, width: saved.width, height: saved.height })
+  ) {
+    return {
+      bounds: { x: saved.x, y: saved.y, width: saved.width, height: saved.height },
+      maximized: saved.maximized ?? false,
+    };
+  }
+  return { maximized: saved?.maximized ?? false };
+}
+
+export function trackBounds(win: BrowserWindow): void {
+  let normalBounds = win.getBounds();
+
+  const save = (): void => {
+    if (win.isDestroyed()) return;
+    writeFileAtomicSync(
+      path(),
+      JSON.stringify({ ...normalBounds, maximized: win.isMaximized() }, null, 2),
+    );
+  };
+
+  const remember = (): void => {
+    if (!win.isMaximized() && !win.isMinimized() && !win.isFullScreen()) {
+      normalBounds = win.getBounds();
+    }
+  };
+
+  win.on("resize", remember);
+  win.on("move", remember);
+  win.on("close", save);
+}

src/main/windows.ts

@@ -3,6 +3,7 @@ import { join, dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 import type { IpcEventChannel, IpcEvents } from "../shared/ipc";
 import { TRAFFIC_LIGHT_INSET } from "../shared/window";
+import { restoreBounds, trackBounds } from "./windowState";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const isDev = !app.isPackaged;
@@ -25,9 +26,11 @@ function load(win: BrowserWindow, hash = ""): void {
 }
 
 export function createMainWindow(): BrowserWindow {
+  const restored = restoreBounds();
   mainWindow = new BrowserWindow({
     width: 1180,
     height: 760,
+    ...restored.bounds,
     minWidth: 940,
     minHeight: 600,
     show: false,
@@ -43,6 +46,9 @@ export function createMainWindow(): BrowserWindow {
     },
   });
 
+  if (restored.maximized) mainWindow.maximize();
+  trackBounds(mainWindow);
+
   mainWindow.once("ready-to-show", () => mainWindow?.show());
   mainWindow.webContents.setWindowOpenHandler(({ url }) => {
     void shell.openExternal(url);