Add comprehensive debugging logging for file loading and print issues

- Added console.log statements throughout file loading flow
- Traces: command-line args → pendingFile → renderer-ready → openFileFromPath → file-opened
- Added logging to print-preview handlers
- Added logging to theme-changed and renderer-ready
- Enabled DevTools automatically for debugging
- Backup renderer-ready timeout (100ms) in case theme-changed doesn't fire

This debugging build will help identify exactly where the flow breaks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/main.js

@@ -112,6 +112,9 @@ function createWindow() {
 
   mainWindow.loadFile(path.join(__dirname, 'index.html'));
 
+  // Open DevTools for debugging
+  mainWindow.webContents.openDevTools();
+
   createMenu();
 
   mainWindow.on('closed', () => {
@@ -1179,8 +1182,11 @@ ipcMain.on('do-print', (event, { withStyles }) => {
 
 // Handle renderer ready for file association
 ipcMain.on('renderer-ready', (event) => {
+  console.log('[MAIN] renderer-ready received, rendererReady was:', rendererReady);
   rendererReady = true;
+  console.log('[MAIN] app.pendingFile:', app.pendingFile);
   if (app.pendingFile) {
+    console.log('[MAIN] Opening pending file:', app.pendingFile);
     openFileFromPath(app.pendingFile);
     app.pendingFile = null;
   }
@@ -1583,13 +1589,17 @@ app.whenReady().then(() => {
   // Handle file association on app startup
   // Process all command line arguments except the first two (node and script path)
   const fileArgs = process.argv.slice(2);
+  console.log('[MAIN] Command line args:', process.argv);
+  console.log('[MAIN] File args to process:', fileArgs);
   for (const arg of fileArgs) {
     if ((arg.endsWith('.md') || arg.endsWith('.markdown')) && fs.existsSync(arg)) {
       // Store the file to open after window is ready
+      console.log('[MAIN] Setting pendingFile to:', arg);
       app.pendingFile = arg;
       break;
     }
   }
+  console.log('[MAIN] Final app.pendingFile:', app.pendingFile);
 });
 
 app.on('window-all-closed', () => {
@@ -1641,16 +1651,23 @@ app.on('open-file', (event, filePath) => {
 
 // Handle file opening from command line or file association
 function openFileFromPath(filePath) {
+  console.log('[MAIN] openFileFromPath called with:', filePath);
+  console.log('[MAIN] rendererReady:', rendererReady, 'mainWindow exists:', !!mainWindow);
   if (fs.existsSync(filePath)) {
     currentFile = filePath;
     const content = fs.readFileSync(filePath, 'utf-8');
+    console.log('[MAIN] File read successfully, content length:', content.length);
     if (mainWindow && mainWindow.webContents && rendererReady) {
       // Send file immediately - renderer-ready means UI is initialized
+      console.log('[MAIN] Sending file-opened to renderer');
       mainWindow.webContents.send('file-opened', { path: filePath, content });
     } else {
       // Store file to open after renderer is ready
+      console.log('[MAIN] Storing as pending file');
       app.pendingFile = filePath;
     }
+  } else {
+    console.error('[MAIN] File does not exist:', filePath);
   }
 }
 

src/renderer.js

@@ -1039,9 +1039,16 @@ document.addEventListener('DOMContentLoaded', () => {
         });
     }
 
-    // Request current theme - renderer-ready will be sent after theme is applied
+    // Request current theme
     ipcRenderer.send('get-theme');
 
+    // Also send renderer-ready immediately as backup
+    // This ensures we don't get stuck waiting for theme-changed
+    setTimeout(() => {
+        console.log('Backup renderer-ready timeout triggered');
+        ipcRenderer.send('renderer-ready');
+    }, 100);
+
     // Set up auto-save interval
     setInterval(() => {
         // Auto-save logic for all tabs
@@ -1059,8 +1066,11 @@ ipcRenderer.on('file-new', () => {
 });
 
 ipcRenderer.on('file-opened', (event, data) => {
+    console.log('[RENDERER] file-opened received:', data.path, 'content length:', data.content.length);
     if (tabManager) {
         tabManager.openFile(data.path, data.content);
+    } else {
+        console.error('[RENDERER] tabManager not initialized!');
     }
 });
 
@@ -1098,11 +1108,13 @@ ipcRenderer.on('toggle-find', () => {
 });
 
 ipcRenderer.on('theme-changed', (event, theme) => {
+    console.log('[RENDERER] Theme changed to:', theme);
     document.body.className = `theme-${theme}`;
 
     // After theme is applied, wait for next frame then signal renderer is ready
     // This ensures complete UI initialization before files are opened
     requestAnimationFrame(() => {
+        console.log('[RENDERER] Sending renderer-ready from theme-changed');
         ipcRenderer.send('renderer-ready');
     });
 });
@@ -1154,10 +1166,12 @@ ipcRenderer.on('adjust-font-size', (event, action) => {
 
 // Print preview request handlers - handle printing directly
 ipcRenderer.on('print-preview', () => {
+    console.log('[RENDERER] print-preview received');
     handlePrintPreview(false);
 });
 
 ipcRenderer.on('print-preview-styled', () => {
+    console.log('[RENDERER] print-preview-styled received');
     handlePrintPreview(true);
 });