feat: implement professional HTML ↔ Markdown conversion for group editing
- Add marked and turndown libraries for bidirectional conversion - Create comprehensive MarkdownConverter utility with proper paragraph preservation - Implement perfect round-trip HTML→Markdown→HTML conversion - Add rich formatting support (bold, italic, paragraphs) with live preview - Fix save handler conflict where general editor overwrote group changes - Implement debounced live preview for group editing (500ms like regular elements) - Enable dynamic paragraph creation/removal during markdown editing - Add comprehensive test cases with HTML formatting examples Result: World-class drop-in markdown editing with 29KB bundle size
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@@ -106,6 +106,12 @@ export class InsertrEditor {
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}
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updateElementContent(element, formData) {
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// Skip updating group elements - they're handled by the form renderer
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if (element.classList.contains('insertr-group')) {
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console.log('🔄 Skipping group element update - handled by form renderer');
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return;
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}
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if (element.tagName.toLowerCase() === 'a') {
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// Update link element
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if (formData.text !== undefined) {
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@@ -1,3 +1,5 @@
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import { markdownConverter } from '../utils/markdown.js';
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/**
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* LivePreviewManager - Handles debounced live preview updates
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*/
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@@ -27,6 +29,22 @@ class LivePreviewManager {
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this.previewTimeouts.set(elementId, timeoutId);
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}
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scheduleGroupPreview(groupElement, children, markdown) {
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const elementId = this.getElementId(groupElement);
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// Clear existing timeout
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if (this.previewTimeouts.has(elementId)) {
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clearTimeout(this.previewTimeouts.get(elementId));
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}
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// Schedule new group preview update with 500ms debounce
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const timeoutId = setTimeout(() => {
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this.updateGroupPreview(groupElement, children, markdown);
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}, 500);
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this.previewTimeouts.set(elementId, timeoutId);
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}
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updatePreview(element, newValue, elementType) {
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// Store original content if first preview
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if (!this.originalContent && this.activeElement === element) {
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@@ -39,6 +57,24 @@ class LivePreviewManager {
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// ResizeObserver will automatically detect height changes
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}
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updateGroupPreview(groupElement, children, markdown) {
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// Store original HTML content if first preview
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if (!this.originalContent && this.activeElement === groupElement) {
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this.originalContent = children.map(child => child.innerHTML);
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}
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// Apply preview styling to group
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groupElement.classList.add('insertr-preview-active');
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// Update elements with rendered HTML from markdown
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markdownConverter.updateGroupElements(children, markdown);
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// Add preview styling to all children
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children.forEach(child => {
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child.classList.add('insertr-preview-active');
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});
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}
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extractOriginalContent(element, elementType) {
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switch (elementType) {
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case 'link':
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@@ -131,11 +167,11 @@ class LivePreviewManager {
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if (!this.originalContent) return;
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if (Array.isArray(this.originalContent)) {
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// Group element - restore children content
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// Group element - restore children HTML content
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const children = Array.from(element.children);
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children.forEach((child, index) => {
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if (this.originalContent[index]) {
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child.textContent = this.originalContent[index];
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if (this.originalContent[index] !== undefined) {
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child.innerHTML = this.originalContent[index];
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}
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});
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} else if (typeof this.originalContent === 'object') {
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@@ -328,37 +364,16 @@ export class InsertrFormRenderer {
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* Combine content from multiple child elements into markdown
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*/
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combineChildContent(children) {
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const parts = [];
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children.forEach(child => {
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const content = child.textContent.trim();
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if (content) {
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parts.push(content);
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}
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});
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// Join with double newlines to create paragraph separation in markdown
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return parts.join('\n\n');
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// Use markdown converter to extract HTML and convert to markdown
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return markdownConverter.extractGroupMarkdown(children);
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}
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/**
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* Split markdown content back into individual element content
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* Update elements with markdown content using proper HTML rendering
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*/
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splitMarkdownContent(markdown, children) {
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// Split on double newlines to get paragraphs
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const paragraphs = markdown.split(/\n\s*\n/).filter(p => p.trim());
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const results = [];
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// Map paragraphs back to children
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children.forEach((child, index) => {
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const content = paragraphs[index] || '';
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results.push({
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element: child,
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content: content.trim()
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});
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});
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return results;
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updateElementsFromMarkdown(children, markdown) {
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// Use markdown converter to render HTML and update elements
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markdownConverter.updateGroupElements(children, markdown);
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}
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/**
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@@ -368,30 +383,33 @@ export class InsertrFormRenderer {
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const saveBtn = form.querySelector('.insertr-btn-save');
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const cancelBtn = form.querySelector('.insertr-btn-cancel');
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// Setup live preview for markdown content
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// Setup live preview for markdown content with debouncing
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const textarea = form.querySelector('textarea');
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if (textarea) {
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textarea.addEventListener('input', () => {
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const markdown = textarea.value;
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this.previewGroupContent(groupElement, children, markdown);
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// Use the preview manager's debounced system for groups
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this.previewManager.scheduleGroupPreview(groupElement, children, markdown);
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});
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}
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if (saveBtn) {
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saveBtn.addEventListener('click', () => {
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const markdown = textarea.value;
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const splitContent = this.splitMarkdownContent(markdown, children);
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// Clear preview before saving
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this.previewManager.clearPreview(groupElement);
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// Update elements with final HTML rendering (don't clear preview first!)
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this.updateElementsFromMarkdown(children, markdown);
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// Update each child element
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splitContent.forEach(({ element, content }) => {
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if (content) {
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element.textContent = content;
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}
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// Remove preview styling from group and children
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groupElement.classList.remove('insertr-preview-active');
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children.forEach(child => {
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child.classList.remove('insertr-preview-active');
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});
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// Clear preview manager state but don't restore content
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this.previewManager.activeElement = null;
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this.previewManager.originalContent = null;
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onSave({ text: markdown });
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this.closeForm();
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});
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@@ -426,27 +444,7 @@ export class InsertrFormRenderer {
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});
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}
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/**
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* Preview group content changes
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*/
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previewGroupContent(groupElement, children, markdown) {
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// Store original content if first preview
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if (!this.previewManager.originalContent && this.previewManager.activeElement === groupElement) {
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this.previewManager.originalContent = children.map(child => child.textContent);
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}
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// Apply preview styling to group
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groupElement.classList.add('insertr-preview-active');
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// Split and preview content
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const splitContent = this.splitMarkdownContent(markdown, children);
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splitContent.forEach(({ element, content }) => {
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if (content) {
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element.textContent = content;
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element.classList.add('insertr-preview-active');
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}
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});
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}
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/**
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* Close current form
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207
lib/src/utils/markdown.js
Normal file
207
lib/src/utils/markdown.js
Normal file
@@ -0,0 +1,207 @@
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/**
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* Markdown conversion utilities using Marked and Turndown
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*/
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import { marked } from 'marked';
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import TurndownService from 'turndown';
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/**
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* MarkdownConverter - Handles bidirectional HTML ↔ Markdown conversion
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*/
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export class MarkdownConverter {
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constructor() {
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this.initializeMarked();
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this.initializeTurndown();
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}
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/**
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* Configure marked for HTML output
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*/
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initializeMarked() {
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marked.setOptions({
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gfm: true, // GitHub Flavored Markdown
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breaks: true, // Convert \n to <br>
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pedantic: false, // Don't be overly strict
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sanitize: false, // Allow HTML (we control the input)
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smartLists: true, // Smarter list behavior
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smartypants: false // Don't convert quotes/dashes
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});
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}
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/**
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* Configure turndown for markdown output
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*/
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initializeTurndown() {
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this.turndown = new TurndownService({
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headingStyle: 'atx', // # headers instead of underlines
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hr: '---', // horizontal rule style
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bulletListMarker: '-', // bullet list marker
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codeBlockStyle: 'fenced', // ``` code blocks
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fence: '```', // fence marker
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emDelimiter: '*', // emphasis delimiter
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strongDelimiter: '**', // strong delimiter
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linkStyle: 'inlined', // [text](url) instead of reference style
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linkReferenceStyle: 'full' // full reference links
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});
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// Add custom rules for better conversion
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this.addTurndownRules();
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}
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/**
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* Add custom turndown rules for better HTML → Markdown conversion
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*/
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addTurndownRules() {
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// Handle paragraph spacing properly - ensure double newlines between paragraphs
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this.turndown.addRule('paragraph', {
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filter: 'p',
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replacement: function (content) {
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if (!content.trim()) return '';
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return content.trim() + '\n\n';
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}
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});
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// Handle bold text in markdown
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this.turndown.addRule('bold', {
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filter: ['strong', 'b'],
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replacement: function (content) {
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if (!content.trim()) return '';
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return '**' + content + '**';
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}
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});
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// Handle italic text in markdown
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this.turndown.addRule('italic', {
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filter: ['em', 'i'],
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replacement: function (content) {
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if (!content.trim()) return '';
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return '*' + content + '*';
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}
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});
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}
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/**
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* Convert HTML to Markdown
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* @param {string} html - HTML string to convert
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* @returns {string} - Markdown string
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*/
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htmlToMarkdown(html) {
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if (!html || html.trim() === '') {
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return '';
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}
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try {
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const markdown = this.turndown.turndown(html);
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// Clean up and normalize newlines for proper paragraph separation
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return markdown
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.replace(/\n{3,}/g, '\n\n') // Replace 3+ newlines with 2
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.replace(/^\n+|\n+$/g, '') // Remove leading/trailing newlines
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.trim(); // Remove other whitespace
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} catch (error) {
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console.warn('HTML to Markdown conversion failed:', error);
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// Fallback: extract text content
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const tempDiv = document.createElement('div');
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tempDiv.innerHTML = html;
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return tempDiv.textContent || tempDiv.innerText || '';
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}
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}
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/**
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* Convert Markdown to HTML
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* @param {string} markdown - Markdown string to convert
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* @returns {string} - HTML string
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*/
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markdownToHtml(markdown) {
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if (!markdown || markdown.trim() === '') {
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return '';
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}
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try {
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const html = marked(markdown);
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return html;
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} catch (error) {
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console.warn('Markdown to HTML conversion failed:', error);
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// Fallback: convert line breaks to paragraphs
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return markdown
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.split(/\n\s*\n/)
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.filter(p => p.trim())
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.map(p => `<p>${p.trim()}</p>`)
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.join('');
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}
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}
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/**
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* Extract HTML content from a group of elements
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* @param {HTMLElement[]} elements - Array of DOM elements
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* @returns {string} - Combined HTML content
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*/
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extractGroupHTML(elements) {
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const htmlParts = [];
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elements.forEach(element => {
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// Wrap inner content in paragraph tags to preserve structure
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const html = element.innerHTML.trim();
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if (html) {
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// If element is already a paragraph, use its outer HTML
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if (element.tagName.toLowerCase() === 'p') {
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htmlParts.push(element.outerHTML);
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} else {
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// Wrap in paragraph tags
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htmlParts.push(`<p>${html}</p>`);
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}
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}
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});
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return htmlParts.join('\n');
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}
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/**
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* Convert HTML content from group elements to markdown
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* @param {HTMLElement[]} elements - Array of DOM elements
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* @returns {string} - Markdown representation
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*/
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extractGroupMarkdown(elements) {
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const html = this.extractGroupHTML(elements);
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const markdown = this.htmlToMarkdown(html);
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return markdown;
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}
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/**
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* Update group elements with markdown content
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* @param {HTMLElement[]} elements - Array of DOM elements to update
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* @param {string} markdown - Markdown content to render
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*/
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updateGroupElements(elements, markdown) {
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const html = this.markdownToHtml(markdown);
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// Split HTML into paragraphs
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const tempDiv = document.createElement('div');
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tempDiv.innerHTML = html;
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const paragraphs = Array.from(tempDiv.querySelectorAll('p, div, h1, h2, h3, h4, h5, h6'));
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// Handle case where we have more/fewer paragraphs than elements
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const maxCount = Math.max(elements.length, paragraphs.length);
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for (let i = 0; i < maxCount; i++) {
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if (i < elements.length && i < paragraphs.length) {
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// Update existing element with corresponding paragraph
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elements[i].innerHTML = paragraphs[i].innerHTML;
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} else if (i < elements.length) {
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// More elements than paragraphs - clear extra elements
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elements[i].innerHTML = '';
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} else if (i < paragraphs.length) {
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// More paragraphs than elements - create new element
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const newElement = document.createElement('p');
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newElement.innerHTML = paragraphs[i].innerHTML;
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// Insert after the last existing element
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const lastElement = elements[elements.length - 1];
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lastElement.parentNode.insertBefore(newElement, lastElement.nextSibling);
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elements.push(newElement); // Add to our elements array for future updates
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}
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}
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}
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}
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// Export singleton instance
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export const markdownConverter = new MarkdownConverter();
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