fix(renderer): add ensureEditor fallback and fix pandoc export path

1. Source editor blank: Added ensureEditor() method with try-catch that
   lazily creates the CodeMirror editor when setEditorContent is called
   if the initial DOMContentLoaded creation failed or was skipped.
   Replaced inline createEditor calls in createTabElements and
   DOMContentLoaded with ensureEditor().

2. Export via pandoc failing: runPandocCmd parsed the full path
   /bin/linux/pandoc as the command, then prepended it to args because
   parsed.command !== 'pandoc'. This caused pandoc to receive its own
   binary path as the first input file. Fix: use path.basename() to
   check if the command ends with 'pandoc' (or 'pandoc.exe').

Amit Haridas

CLAUDE.md

@@ -1,103 +0,0 @@
-# CLAUDE.md — MarkdownConverter (master)
-
-> General code-quality, JavaScript, git, security, and testing standards are in the **global CLAUDE.md**. This file holds project- and branch-specific notes.
-
-## Project Overview
-
-Electron desktop app for Markdown editing and universal file conversion powered by Pandoc. Cross-platform (Win/macOS/Linux). Features: multi-tab editor with live preview, 25+ themes, PDF viewer/editor (merge/split/compress/rotate/watermark/password), export to 20+ formats (PDF/DOCX/ODT/EPUB/HTML/LaTeX/RTF/PPTX), batch conversion, syntax highlighting, diagram support (Mermaid), Git integration, and a plugin system.
-
-- **Version:** 4.4.3
-- **License:** MIT
-- **App ID:** `com.concreteinfo.markdownconverter`
-
-## Branch Specifics
-
-This is the **primary/release branch** — a vanilla JavaScript Electron app with no bundler or framework in the renderer. The renderer is a single large `renderer.js` (5,300+ lines) loaded directly via `src/index.html`. All UI is hand-rolled DOM manipulation.
-
-## Architecture
-
-### Main Process (`src/main.js` — 4,260 lines)
-Monolithic main process file. Contains all IPC handlers, Pandoc invocation, file operations, menu definitions (600+ lines), and window lifecycle. Key modules extracted:
-- `src/main/PDFOperations.js` — PDF manipulation via `pdf-lib` (merge, split, compress, rotate, delete, reorder, watermark, encrypt, decrypt, permissions)
-- `src/main/GitOperations.js` — Git status/stage/commit/log via `simple-git`
-
-### Renderer (`src/renderer.js` — 5,361 lines)
-Vanilla JS, no framework. Directly manipulates DOM. Loads CodeMirror 6 via `src/editor/codemirror-setup.js`. Uses `marked` + `highlight.js` + `DOMPurify` + `mermaid` for rendering. Lazy-loads sidebar panels, REPL, command palette, zen mode.
-
-### Preload (`src/preload.js` — 448 lines)
-Exists as IPC bridge, but **`contextIsolation: false` and `nodeIntegration: true`** — the renderer has full Node access. Preload is effectively a thin passthrough.
-
-### Security Model
-- `contextIsolation: false` + `nodeIntegration: true` (legacy; the react-electron branch fixes this)
-- Pandoc invoked via `execFile` (not `exec`) to prevent shell injection
-- Path traversal protection: `validatePath()`, `resolveWritablePath()`, blocks sensitive system dirs
-- Permission handler only allows `clipboard-read`/`clipboard-write`
-- Rate limiter on conversions (2-second minimum interval)
-- File size limit: 50MB
-- Error message sanitization strips absolute paths
-
-### Plugin System (`src/plugins/`)
-Manifest-based discovery (`manifest.json`). Built-in `writing-studio` plugin with sprint/goal/snapshot management. Plugin API exposed via `src/plugins/plugin-api.js`.
-
-### Settings
-Custom JSON file store at `<userData>/settings.json` (NOT `electron-store` despite the dependency). Recent files at `<userData>/recent-files.json`.
-
-## System Dependencies
-
-| Dependency | Required | Notes |
-|---|---|---|
-| **Node.js** | >= 20 | Electron 41 bundles Node 20.x |
-| **Pandoc** | Yes (for exports) | Downloaded to `bin/<platform>/pandoc` via `scripts/download-tools.js` (v3.9.0.2). Falls back to system PATH. Must be present for DOCX/ODT/EPUB/LaTeX/PPTX export. |
-| **FFmpeg** | Bundled | `ffmpeg-static` npm package; `asarUnpacked` for packaged builds |
-| **MiKTeX / TeX Live** | Optional | For LaTeX PDF export; MiKTeX PATH injected on Windows automatically |
-| **ImageMagick** | Optional | Linux image conversion; listed as deb dependency |
-| **LibreOffice** | Optional | Enhanced document conversion; listed as deb dependency |
-
-## Development Commands
-
-```bash
-npm start                  # Launch Electron app (dev mode)
-npm test                   # Jest test suite
-npm test:watch             # Jest in watch mode
-npm test:coverage          # Jest with coverage report
-npm run lint               # ESLint check (src + tests)
-npm run lint:fix           # ESLint auto-fix
-npm run format             # Prettier write
-npm run format:check       # Prettier check only
-npm run download-tools     # Download Pandoc binaries to bin/
-npm run generate-icons     # Generate app icons via sharp
-```
-
-## Build & Package
-
-**Tool:** `electron-builder` (v26.0.12), config inline in `package.json` (no separate config file).
-
-| Target | Platforms |
-|---|---|
-| `npm run build` | electron-builder (default platform) |
-| `npm run build:win` | Windows: NSIS installer + portable + zip (x64) |
-| `npm run build:mac` | macOS: default dmg |
-| `npm run build:linux` | Linux: deb + AppImage + snap |
-| `npm run dist` | Build without publish |
-| `npm run dist:all` | Build for all platforms |
-
-**Bundled with builds:** Pandoc binary per platform. FFmpeg via `ffmpeg-static` (asarUnpacked). NSIS installer uses custom script at `scripts/nsis-installer.nsh`.
-
-**Output:** `dist/` directory.
-
-**CI:** GitHub Actions workflows in `.github/workflows/` (ci.yml, release.yml).
-
-## Project Conventions / Gotchas
-
-- **No bundler/transpilation.** The app uses vanilla CommonJS JavaScript. `src/main.js` is loaded directly by Electron. No webpack, no Vite, no TypeScript, no Babel.
-- **Monolithic files.** `main.js` (4,260 lines) and `renderer.js` (5,361 lines) contain most logic. Not ideal but is the current state of this branch.
-- **CodeMirror 6** for the editor, configured in `src/editor/codemirror-setup.js`.
-- **PDF rendering** uses `pdfjs-dist`; **PDF manipulation** uses `pdf-lib` in the main process.
-- **Renderer security is weak** — full Node access in renderer. Do NOT introduce new privileged renderer code without understanding this.
-- **Pandoc is external.** Must be installed separately or downloaded via `npm run download-tools`. HTML and built-in PDF export work without Pandoc; other formats require it.
-- **PDF export fallback chain:** xelatex -> pdflatex -> lualatex -> Electron built-in `printToPDF()`.
-- **ESLint flat config** (`eslint.config.js`) with ECMAScript 2022. Prettier with 2-space indent, single quotes, semicolons, 100-char width.
-- **Tests:** Jest with jsdom environment, 15% coverage threshold. 24 test files in `tests/`.
-- **File associations:** `.md`, `.markdown`, `.pdf` registered at install.
-- **Single instance lock** enforced via `app.requestSingleInstanceLock()`.
-- **Adapters layer** (`src/adapters/`) abstracts file system operations for potential future non-Electron targets.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "markdown-converter",
-  "version": "4.4.3",
+  "version": "4.4.2",
   "description": "Professional Markdown editor and universal file converter with PDF editing, batch processing, and syntax highlighting",
   "main": "src/main.js",
   "scripts": {

src/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8">
     <!-- CSP: unsafe-inline/unsafe-eval required for marked.js extensions and Mermaid -->
     <!-- TODO: Migrate to nonce-based CSP for better security -->
-    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' https://www.plantuml.com;">
+    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; img-src 'self' data: blob:; font-src 'self' data: https://cdn.jsdelivr.net; connect-src 'self' https://www.plantuml.com;">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>MarkdownConverter</title>
     <!-- Design tokens - loaded first for CSS variable availability -->

src/main.js

@@ -242,7 +242,9 @@ function runPandoc(args, callback) {
 function runPandocCmd(cmdString, callback) {
   const parsed = parseCommand(cmdString);
   // Skip 'pandoc' if it's the first element (command itself)
-  const args = parsed.command === 'pandoc' ? parsed.args : [parsed.command, ...parsed.args];
+  // Use path.basename to handle full paths like bin/linux/pandoc
+  const cmdBase = path.basename(parsed.command).replace(/\.exe$/i, '');
+  const args = cmdBase === 'pandoc' ? parsed.args : [parsed.command, ...parsed.args];
   const pandocPath = getPandocPath();
   execFile(pandocPath, args, { maxBuffer: 10 * 1024 * 1024 }, callback);
 }

src/renderer.js

@@ -1,9 +1,20 @@
 /**
  * MarkdownConverter Renderer Process
- * @version 4.4.3
+ * @version 4.4.2
  */
 
 const { ipcRenderer } = require('electron');
+
+// Shim window.electronAPI for main window which uses nodeIntegration
+// without preload script (window.electronAPI is normally set by preload.js).
+if (typeof window !== 'undefined' && !window.electronAPI) {
+    window.electronAPI = {
+        getAppVersion: () => ipcRenderer.invoke('get-app-version'),
+        invoke: (channel, data) => ipcRenderer.invoke(channel, data),
+        on: (channel, callback) => ipcRenderer.on(channel, (event, ...args) => callback(...args))
+    };
+}
+
 const marked = require('marked');
 const { markedHighlight } = require('marked-highlight');
 const createDOMPurify = require('dompurify');
@@ -11,53 +22,12 @@ const DOMPurify = createDOMPurify(window);
 const hljs = require('highlight.js');
 const { createEditor } = require('./editor/codemirror-setup');
 const { undo, redo } = require('@codemirror/commands');
-
-// Define a fallback window.electronAPI object for when contextIsolation is disabled
-// and the preload script is not loaded in the main window context.
-if (typeof window !== 'undefined' && !window.electronAPI) {
-    window.electronAPI = {
-        send: (channel, data) => {
-            ipcRenderer.send(channel, data);
-        },
-        invoke: async (channel, data) => {
-            return await ipcRenderer.invoke(channel, data);
-        },
-        on: (channel, callback) => {
-            const subscription = (event, ...args) => callback(...args);
-            ipcRenderer.on(channel, subscription);
-            return () => {
-                ipcRenderer.removeListener(channel, subscription);
-            };
-        },
-        once: (channel, callback) => {
-            ipcRenderer.once(channel, (event, ...args) => callback(...args));
-        },
-        removeAllListeners: (channel) => {
-            ipcRenderer.removeAllListeners(channel);
-        },
-        getAppVersion: () => ipcRenderer.invoke('get-app-version'),
-        file: {
-            read: (filePath) => ipcRenderer.invoke('read-file', filePath),
-            write: (filePath, content) => ipcRenderer.invoke('write-file', { path: filePath, content }),
-            delete: (filePath) => ipcRenderer.invoke('delete-file', filePath),
-            ensureDir: (dirPath) => ipcRenderer.invoke('ensure-directory', dirPath),
-            exists: (filePath) => ipcRenderer.invoke('path-exists', filePath),
-            isDirectory: (filePath) => ipcRenderer.invoke('is-directory', filePath),
-            copy: (source, destination) => ipcRenderer.invoke('copy-path', { source, destination }),
-            move: (source, destination) => ipcRenderer.invoke('move-path', { source, destination })
-        }
-    };
-}
-
-// Use window.ModalManager if already set by script tag, otherwise require it.
-// This prevents "Identifier 'ModalManager' has already been declared" when
-// both the script tag in index.html and CommonJS require() declare it.
-let _ModalManager;
-if (typeof window !== 'undefined' && window.ModalManager) {
-    _ModalManager = window.ModalManager;
-} else {
+// ModalManager is loaded via <script src="utils/ModalManager.js"> in index.html.
+// It already exists in the global scope — re-declaring with let/const causes
+// SyntaxError: "Identifier 'ModalManager' has already been declared".
+if (typeof ModalManager === 'undefined') {
     const result = require('./utils/ModalManager');
-    _ModalManager = result.ModalManager || result;
+    ModalManager = result.ModalManager || result;
 }
 // Lazy-loaded modules — defer heavy imports until first use
 let _SidebarManager, _renderTemplatesPanel, _renderExplorerPanel, _renderGitPanel, _renderSnippetsPanel;
@@ -520,38 +490,7 @@ class TabManager {
         document.querySelector('.editor-container').appendChild(tabContent);
 
         // Initialize CodeMirror editor
-        const editorContainer = document.getElementById(`editor-cm-${tab.id}`);
-        if (editorContainer) {
-            const isDark = document.body.className.includes('dark');
-            tab.editorView = createEditor(editorContainer, {
-                content: tab.content,
-                onChange: (newContent) => {
-                    tab.content = newContent;
-                    tab.isDirty = true;
-                    // Dynamically enable/disable Large File Mode on edit
-                    if (newContent.length > 1024 * 1024) {
-                        if (!tab.largeFileMode) {
-                            tab.largeFileMode = true;
-                            this.isPreviewVisible = false;
-                            this.updatePreviewVisibility();
-                            notifyUser('Large content detected (>1MB). Large File Mode enabled to maintain peak responsiveness. Live preview auto-render is disabled.', 'warning');
-                        }
-                    } else {
-                        tab.largeFileMode = false;
-                    }
-                    this.updatePreview(tab.id);
-                    this.updateWordCount();
-                    this.updateTabBar();
-                    if (outlinePanelContainer?._refreshOutline) outlinePanelContainer._refreshOutline();
-                },
-                onUpdate: (view) => {
-                    this.updateCursorPosition(view);
-                    if (outlinePanelContainer?._setActiveHeading) outlinePanelContainer._setActiveHeading(view.state.doc.lineAt(view.state.selection.main.head).number);
-                },
-                isDark,
-                showLineNumbers: this.showLineNumbers,
-            });
-        }
+        this.ensureEditor(tab);
     }
     
     switchToTab(tabId) {
@@ -1522,9 +1461,47 @@ class TabManager {
         return tab?.content || '';
     }
 
+    // Ensure a tab has a CodeMirror editor (lazy creation fallback)
+    ensureEditor(tab) {
+        if (tab.editorView) return true;
+        const editorContainer = document.getElementById(`editor-cm-${tab.id}`);
+        if (!editorContainer) {
+            console.error(`[ensureEditor] editor-cm-${tab.id} not found in DOM`);
+            return false;
+        }
+        try {
+            const isDark = document.body.className.includes('dark');
+            tab.editorView = createEditor(editorContainer, {
+                content: tab.content,
+                onChange: (newContent) => {
+                    tab.content = newContent;
+                    tab.isDirty = true;
+                    this.updatePreview(tab.id);
+                    this.updateWordCount();
+                    this.updateTabBar();
+                    if (outlinePanelContainer?._refreshOutline) outlinePanelContainer._refreshOutline();
+                },
+                onUpdate: (view) => {
+                    this.updateCursorPosition(view);
+                    if (outlinePanelContainer?._setActiveHeading) outlinePanelContainer._setActiveHeading(view.state.doc.lineAt(view.state.selection.main.head).number);
+                },
+                isDark,
+                showLineNumbers: this.showLineNumbers,
+            });
+            console.log(`[ensureEditor] Created editor for tab ${tab.id}`);
+            return true;
+        } catch (err) {
+            console.error(`[ensureEditor] Failed to create editor for tab ${tab.id}:`, err);
+            return false;
+        }
+    }
+
     // Set content in editor
     setEditorContent(tabId, content) {
         const tab = this.tabs.get(tabId);
+        if (!tab?.editorView) {
+            this.ensureEditor(tab);
+        }
         if (tab?.editorView) {
             tab.editorView.dispatch({
                 changes: { from: 0, to: tab.editorView.state.doc.length, insert: content }
@@ -1581,7 +1558,6 @@ let tabManager;
 let replPanel;
 
 document.addEventListener('DOMContentLoaded', async () => {
-    const ModalManager = _ModalManager;
     tabManager = new TabManager();
 
     // Load saved Custom Preview CSS if present
@@ -1714,11 +1690,6 @@ document.addEventListener('DOMContentLoaded', async () => {
     });
 
     const statusBarRight = document.querySelector('.status-bar-right');
-
-    // Initialize command palette
-    const CommandPalette = getCommandPalette();
-    const commandPalette = new CommandPalette();
-
     const pluginRegistry = new PluginRegistry({
         sidebar: sidebarManager,
         commands: commandPalette,
@@ -1774,7 +1745,8 @@ document.addEventListener('DOMContentLoaded', async () => {
         const welcomeHtml = getCreateWelcomeContent()(recentFiles, appVersion);
 
         const tab = tabManager.tabs.get(tabManager.activeTabId);
-        if (tab) {
+        // Only show welcome if no file was opened while we were awaiting
+        if (tab && !tab.filePath && tab.content === '') {
             tab.title = 'Welcome';
             tab.content = '';
             const preview = document.getElementById(`preview-${tab.id}`);
@@ -1855,6 +1827,10 @@ document.addEventListener('DOMContentLoaded', async () => {
         }
     });
 
+    // Initialize command palette
+    const CommandPalette = getCommandPalette();
+    const commandPalette = new CommandPalette();
+
     // Initialize print preview
     const PrintPreview = getPrintPreview();
     const printPreview = new PrintPreview();
@@ -1939,27 +1915,9 @@ document.addEventListener('DOMContentLoaded', async () => {
     });
 
     // Initialize CodeMirror for the initial tab (tab 1)
-    const initialEditorContainer = document.getElementById('editor-cm-1');
-    if (initialEditorContainer) {
-        const tab = tabManager.tabs.get(1);
-        const isDark = document.body.className.includes('dark');
-        tab.editorView = createEditor(initialEditorContainer, {
-            content: tab.content,
-            onChange: (newContent) => {
-                tab.content = newContent;
-                tab.isDirty = true;
-                tabManager.updatePreview(tab.id);
-                tabManager.updateWordCount();
-                tabManager.updateTabBar();
-                if (outlinePanelContainer?._refreshOutline) outlinePanelContainer._refreshOutline();
-            },
-            onUpdate: (view) => {
-                tabManager.updateCursorPosition(view);
-                if (outlinePanelContainer?._setActiveHeading) outlinePanelContainer._setActiveHeading(view.state.doc.lineAt(view.state.selection.main.head).number);
-            },
-            isDark,
-            showLineNumbers: tabManager.showLineNumbers,
-        });
+    const initialTab = tabManager.tabs.get(1);
+    if (initialTab) {
+        tabManager.ensureEditor(initialTab);
     }
 
     // Request current theme

src/utils/ModalManager.js

@@ -1,6 +1,6 @@
 /**
  * ModalManager - Unified modal system with accessibility support
- * @version 4.4.3
+ * @version 4.4.2
  */
 class ModalManager {
     #modal;