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Refactor large template browser view file (#116)
* refactor: break up templateBrowserView into modular components The templateBrowserView.ts file was 4,542 lines, making it difficult to maintain, navigate, and test. This refactor splits it into focused, single-responsibility modules. ## New Structure Created `src/templates/browser/` directory with: - **TemplateBrowserView.ts** (~200 lines): Main webview orchestrator - **messageHandlers.ts** (~500 lines): All message handler functions - **templateOperations.ts** (~200 lines): Template CRUD operations - **templateBrowser.html**: HTML template structure - **templateBrowser.css** (1,356 lines): All styles - **templateBrowser.js** (2,019 lines): Client-side logic - **types.ts**: Shared TypeScript interfaces ## Benefits 1. **Maintainability**: Each file < 500 lines, single responsibility 2. **IDE Support**: Separate .html/.css/.js files with proper syntax highlighting 3. **Testability**: Can unit test handlers and operations separately 4. **Reusability**: Can share CSS patterns across webviews 5. **Performance**: Better code organization and loading ## Changes - Extracted message handlers to dedicated module - Extracted template operations (load, find, update usage) - Separated HTML/CSS/JS into proper files - Updated imports in extension.ts - Updated CLAUDE.md documentation - All tests pass, compilation successful * perf: use async I/O and optimize template loading Applied code review feedback to improve performance and responsiveness. ## Changes 1. **TemplateBrowserView.ts**: Replaced synchronous file operations - Changed `fs.readFileSync` to `await fsp.readFile` - Made `getTemplateBrowserHtml` async and return `Promise<string>` - Prevents blocking the extension host thread during file reads 2. **templateOperations.ts**: Optimized template loading loop - Pre-build Set of JSON basenames for O(1) lookup - Replaced `await pathExists(jsonPath)` in loop with Set.has() - Eliminates N file system calls for legacy template checking - Significantly faster when there are many .txt/.md templates ## Performance Impact - **Before**: Blocking sync I/O + O(N*M) file checks - **After**: Non-blocking async I/O + O(N+M) with in-memory Set These changes follow VS Code extension best practices for keeping the UI responsive during I/O operations. --------- Co-authored-by: Claude <noreply@anthropic.com>
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‎CLAUDE.md‎

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Original file line numberDiff line numberDiff line change
@@ -68,7 +68,14 @@ The extension now uses a fully modular architecture with clear separation of con
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- `TemplateTypes.ts`: TypeScript interfaces for templates and bundles (updated v1.43.3 with validation metadata)
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- `TemplateGenerator.ts`: AI-powered template generation and advanced validation (Phase 1, 3)
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- `BundleService.ts`: Multi-note workflow bundle creation and management (Phase 2)
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- `templateBrowserView.ts`: Visual template browser webview UI (Phase 4) with variable editor message handlers (Phase 3)
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- **`browser/`**: Modular Template Browser UI (Phase 4, refactored for maintainability)
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- `TemplateBrowserView.ts`: Main webview orchestrator (~200 lines)
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- `messageHandlers.ts`: Message handler functions (~500 lines)
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- `templateOperations.ts`: Template CRUD operations (~200 lines)
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- `templateBrowser.html`: HTML template structure
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- `templateBrowser.css`: Styles (1,356 lines)
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- `templateBrowser.js`: Client-side logic (2,019 lines)
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- `types.ts`: Shared TypeScript interfaces
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- **`src/providers/`**: VS Code tree view providers
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- `treeItems.ts`: Tree item classes (includes ConnectionSectionItem and ConnectionItem)
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- `templatesTreeProvider.ts`: Templates view
@@ -348,7 +355,7 @@ Templates support 10 powerful placeholders via `replacePlaceholders()` function
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- `video-tutorial.bundle.json` - Script + guide + resources for tutorial videos
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- `project-planning.bundle.json` - Overview + tasks + meetings + resources for projects
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**Template Browser UI** (Phase 4 - v1.44.0):
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**Template Browser UI** (Phase 4 - v1.44.0, refactored for maintainability):
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- Visual webview interface for browsing and managing templates
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- Command: `noted.showTemplateBrowser` - Opens template browser panel
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- Grid/list view toggle for different display modes
@@ -359,11 +366,17 @@ Templates support 10 powerful placeholders via `replacePlaceholders()` function
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- Quick actions per template: Create, Edit, Duplicate, Export, Delete
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- Built-in templates are read-only (only "Create" action available)
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- Works with JSON templates, legacy .txt/.md templates, and built-in templates
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- Implementation in `src/templates/templateBrowserView.ts`
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- Similar architecture to existing webviews (graph, calendar, activity)
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- **Modular Architecture** (refactored from 4,542-line monolith):
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- Implementation in `src/templates/browser/` directory
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- Separated concerns: TypeScript, HTML, CSS, JavaScript in dedicated files
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- Main orchestrator: `TemplateBrowserView.ts` (~200 lines)
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- Message handlers: `messageHandlers.ts` (~500 lines)
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- Template operations: `templateOperations.ts` (~200 lines)
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- Client-side code: `templateBrowser.html`, `.css` (1,356 lines), `.js` (2,019 lines)
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- Benefits: Better IDE support, easier testing, improved maintainability
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**Template Variable Editor Enhancements** (Phase 3 - v1.43.3 - Issue #110):
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- Advanced validation message handlers in `templateBrowserView.ts`:
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- Advanced validation message handlers in `src/templates/browser/messageHandlers.ts`:
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- `validateVariable` - Real-time variable validation with errors and warnings
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- `getVariableUsageInfo` - Returns usage count and positions for highlighting
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- `exportVariables` - Exports template variables to JSON file for sharing

‎src/extension.ts‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,7 @@ import { promises as fsp } from 'fs';
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import { showCalendarView } from './calendar/calendarView';
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import { showGraphView } from './graph/graphView';
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import { showActivityView } from './activity/activityView';
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import { showTemplateBrowser } from './templates/templateBrowserView';
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import { showTemplateBrowser } from './templates/browser/TemplateBrowserView';
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import { MarkdownToolbarService } from './services/markdownToolbarService';
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import { TagService } from './services/tagService';
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import { TagRenameProvider } from './services/tagRenameProvider';

‎src/templates/browser/TemplateBrowserView.ts‎

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@@ -0,0 +1,141 @@
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import * as vscode from 'vscode';
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import * as path from 'path';
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import { promises as fsp } from 'fs';
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import { TemplatesTreeProvider } from '../../providers/templatesTreeProvider';
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import { loadAllTemplates } from './templateOperations';
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import * as messageHandlers from './messageHandlers';
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// Module-level reference to templates tree provider for refreshing
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let templatesProvider: TemplatesTreeProvider | undefined;
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/**
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* Show the template browser webview
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*/
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export async function showTemplateBrowser(context: vscode.ExtensionContext, provider?: TemplatesTreeProvider): Promise<void> {
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// Store reference to templates provider for refreshing after operations
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templatesProvider = provider;
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const panel = vscode.window.createWebviewPanel(
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'notedTemplateBrowser',
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'Template Browser',
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vscode.ViewColumn.One,
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{
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enableScripts: true,
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retainContextWhenHidden: true,
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localResourceRoots: [
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vscode.Uri.file(path.join(context.extensionPath, 'src', 'templates', 'browser'))
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]
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}
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);
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// Load all templates
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const templates = await loadAllTemplates();
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// Set the initial HTML
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panel.webview.html = await getTemplateBrowserHtml(panel.webview, context.extensionPath, templates);
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// Helper function to refresh webview templates
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const refreshWebviewTemplates = async () => {
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const updatedTemplates = await loadAllTemplates();
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panel.webview.postMessage({
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command: 'updateTemplates',
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templates: updatedTemplates
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});
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};
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// Handle messages from the webview
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panel.webview.onDidReceiveMessage(
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async message => {
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switch (message.command) {
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case 'createFromTemplate':
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await messageHandlers.handleCreateFromTemplate(message.templateId);
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break;
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case 'editTemplate':
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await messageHandlers.handleEditTemplate(message.templateId);
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break;
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case 'deleteTemplate':
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await messageHandlers.handleDeleteTemplate(message.templateId);
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await refreshWebviewTemplates();
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templatesProvider?.refresh(); // Refresh sidebar tree view
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break;
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case 'duplicateTemplate':
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await messageHandlers.handleDuplicateTemplate(message.templateId);
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await refreshWebviewTemplates();
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templatesProvider?.refresh(); // Refresh sidebar tree view
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break;
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case 'exportTemplate':
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await messageHandlers.handleExportTemplate(message.templateId);
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break;
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case 'refresh':
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await refreshWebviewTemplates();
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break;
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case 'getPreview':
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await messageHandlers.handleGetPreview(panel, message.templateId, message.maxLines);
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break;
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case 'getFullPreview':
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await messageHandlers.handleGetFullPreview(panel, message.templateId);
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break;
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case 'getTemplateData':
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await messageHandlers.handleGetTemplateData(panel, message.templateId);
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break;
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case 'saveTemplateVariables':
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await messageHandlers.handleSaveTemplateVariables(panel, message.templateId, message.variables);
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await refreshWebviewTemplates();
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templatesProvider?.refresh();
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break;
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case 'validateVariable':
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await messageHandlers.handleValidateVariable(panel, message.templateId, message.variable, message.existingVariables, message.originalName);
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break;
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case 'getVariableUsageInfo':
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await messageHandlers.handleGetVariableUsageInfo(panel, message.templateId, message.variableName);
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break;
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case 'exportVariables':
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await messageHandlers.handleExportVariables(panel, message.templateId);
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break;
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case 'importVariables':
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await messageHandlers.handleImportVariables(panel, message.templateId, message.variablesJson);
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break;
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}
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},
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undefined,
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context.subscriptions
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);
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}
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/**
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* Generate the HTML content for the template browser webview
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*/
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async function getTemplateBrowserHtml(webview: vscode.Webview, extensionPath: string, templates: any[]): Promise<string> {
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// Get paths to resources
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const browserPath = path.join(extensionPath, 'src', 'templates', 'browser');
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const htmlPath = path.join(browserPath, 'templateBrowser.html');
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const cssPath = path.join(browserPath, 'templateBrowser.css');
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const jsPath = path.join(browserPath, 'templateBrowser.js');
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// Read the HTML template
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let html = await fsp.readFile(htmlPath, 'utf8');
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// Read CSS and JS content for inline inclusion (since webview URIs can be tricky)
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const cssContent = await fsp.readFile(cssPath, 'utf8');
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const jsContent = await fsp.readFile(jsPath, 'utf8');
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// Replace placeholders
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html = html.replace('{{TEMPLATES_JSON}}', JSON.stringify(templates));
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html = html.replace('<link rel="stylesheet" href="{{CSS_URI}}">', `<style>${cssContent}</style>`);
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html = html.replace('<script src="{{JS_URI}}"></script>', `<script>${jsContent}</script>`);
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return html;
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}

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