Arx 0.5.2: quit on close, single instance

app/main.cjs

@@ -92,7 +92,7 @@ function smokeTest() {
 
 function createWindow() {
   mainWindow = new BrowserWindow({
-    width: 1100, height: 780, minWidth: 760, minHeight: 560, title: 'Arx · Devseis Endpoint Auditor',
+    width: 1100, height: 780, minWidth: 760, minHeight: 560, title: 'Arx',
     webPreferences: { preload: path.join(__dirname, 'preload.cjs'), contextIsolation: true, nodeIntegration: false, sandbox: true },
   });
   // DEVSEIS_SMOKE_MODEL=1 also loads the AI model (downloads it on first run).
@@ -100,13 +100,26 @@ function createWindow() {
   if (SMOKE) smokeTest();
 }
 
+// One Arx at a time: a second launch (a double-click while Arx is still starting or closing) hands over to the running
+// copy, which shows its window, and exits; two copies could leave one stuck in the background with no window.
+const firstInstance = !!SMOKE || app.requestSingleInstanceLock();
+if (!firstInstance) app.quit();
+app.on('second-instance', () => {
+  if (!mainWindow || mainWindow.isDestroyed()) { createWindow(); return; }
+  if (mainWindow.isMinimized()) mainWindow.restore();
+  mainWindow.show();
+  mainWindow.focus();
+});
+
 app.whenReady().then(() => {
+  if (!firstInstance) return;
   createWindow();
   // Fetch newer vulnerability data in the background; the audit uses the last good copy if this fails.
   vulndb.refresh(vulndbDirs()[0]).catch(error => console.warn(`Vulnerability data not refreshed: ${error.message}`));
   app.on('activate', () => { if (BrowserWindow.getAllWindows().length === 0) createWindow(); });
 });
-app.on('window-all-closed', () => { if (process.platform !== 'darwin') app.quit(); });
+// Closing the Arx window quits Arx, on macOS too: users expect a closed utility to be gone, not running unseen.
+app.on('window-all-closed', () => app.quit());
 
 // --- What will be audited -------------------------------------------------------
 ipcMain.handle('audit:plan', () => {

app/package.json

@@ -1,7 +1,7 @@
 {
   "name": "devseis-endpoint-auditor",
   "productName": "Arx",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "description": "Read-only endpoint audit for ISO 27001, GDPR and the EU AI Act, with a local AI auditor.",
   "author": {
     "name": "Devseis",

index.html

@@ -56,7 +56,7 @@
         <label class="btn btn-lg" for="reportFile" title="Open the …-evidence.json file Arx saves next to each report">Open a report</label>
         <input type="file" id="reportFile" accept=".json,application/json" hidden>
       </div>
-      <p class="tiny muted" id="heroMeta">Free · open source · version 0.5.1</p>
+      <p class="tiny muted" id="heroMeta">Free · open source · version 0.5.2</p>
     </section>
 
     <section class="wrap">
@@ -95,7 +95,7 @@
     </section>
 
     <section class="wrap section" id="download">
-      <div class="section-head"><h2>Download Arx</h2><span class="tiny muted" id="dlVersion">Version 0.5.1</span></div>
+      <div class="section-head"><h2>Download Arx</h2><span class="tiny muted" id="dlVersion">Version 0.5.2</span></div>
       <div class="dl-grid">
         <article class="dl-card" data-os="mac">
           <span class="ribbon ribbon-you hidden">YOUR SYSTEM</span>