Htmly — WYSIWYG HTML Editor for VS Code

Htmly is a VS Code extension that provides a full-featured WYSIWYG (What You See Is What You Get) HTML editor directly within VS Code. Edit HTML files visually with a familiar rich-text editing experience, or switch to source code mode for direct HTML manipulation.

Features Implemented in v1.5

LaTeX Math

• Inline Math — Type $E=mc^2$ for inline math using KaTeX
• Block Math — Type $$...$$ for display/block equations
• Math Toolbar — Quick insert common symbols (Greek letters, operators, relations, arrows)
• Live Preview — Real-time LaTeX rendering in the editor

Wiki Links & Backlinks

• Wiki Links — Type [[Page Name]] to create links between documents
• Backlinks Panel — See all pages that link to the current document
• Auto-complete — Suggestions appear as you type [[
• Create New Pages — Option to create non-existent linked pages

Static Site Publishing

• GitHub Pages Export — Publish directly to GitHub Pages with CI workflow
• SEO Settings — Configure title, description, and og:image for search engines
• Custom Domain — Support for custom domains with CNAME file
• Static Site Export — Export workspace as static HTML site

Table Enhancements

• Column Sorting — Click to sort by any column (ascending/descending)
• Multi-sort — Shift+click to add secondary sort columns
• Row Filtering — Filter table rows with search input
• Date Column — Native date picker cells
• Checkbox Column — Interactive checkbox cells with sorting support

Features Implemented in v1.2

Mode Switching

• Visual Mode (WYSIWYG) — Rich text editing with Tiptap, featuring floating bubble menu on text selection
• Source Mode — Direct HTML editing with CodeMirror, syntax highlighting, line numbers, and Emmet abbreviation support
• Preview Mode — Sandboxed iframe rendering with device selector (Desktop/Tablet/Mobile)
• Split-Screen Mode — Side-by-side or top-bottom source + preview with draggable resizable divider

Toolbar & Formatting

• Full formatting toolbar: Bold, Italic, Underline, Strikethrough, Headings (H1-H3), Bullet/Ordered Lists, Blockquote, Code Block
• Text alignment (Left/Center/Right) with inline style="text-align"
• Text color picker with inline color styling
• Insert Link / Remove Link with URL/text dialog
• Insert Image with src/alt dialog and drag-resize handles
• Insert Table with 3×3 grid, header row, add/remove rows/columns, merge/split cells, column resize
• Horizontal Rule insertion
• Highlight (<mark>) formatting
• Toggle button text labels via htmly.showButtonLabels setting

Text Editing

• Markdown Shortcuts (when enabled): # → <h1>, **text** → <strong>, *text* → <em>, `code` → <code>, - → <ul>, 1. → <ol>, > → <blockquote>, --- → <hr>
• Slash Commands — Type / at block start for searchable command menu (Heading, Paragraph, List, Blockquote, Code Block, Table, Image, HR, Divider)
• Format Painter — Copy/paste formatting with single-click or double-click (persistent) mode
• Bubble Menu — Floating toolbar appears on text selection with Bold, Italic, Underline, Link, Code, Highlight

Drag-and-Drop

• Drag handle appears on block hover
• Reorder headings, paragraphs, lists, blockquotes, code blocks, tables
• Undoable with Ctrl+Z

Settings

• htmly.defaultMode — Initial mode on open (visual/source/preview)
• htmly.defaultFontSize — Editor font size (affects both Tiptap and CodeMirror)
• htmly.enableMarkdownShortcuts — Toggle markdown input rules
• htmly.splitScreenDirection — horizontal (side-by-side) or vertical (top-bottom)
• htmly.showButtonLabels — Show/hide toolbar button text labels
• htmly.autoHideToolbarInPreview — Hide formatting toolbar in Preview mode
• htmly.customTheme.primaryColor — Custom accent color for toolbar active states

Large File Handling

• Files over 500KB automatically switch to Source-only mode
• Visual and Preview modes disabled with informational banner

Cross-Mode Features

• Undo/redo history preserved across mode switches
• Theme changes propagate in real-time (dark/light)
• Settings changes take effect without VS Code restart
• Fragment documents (no doctype/html/body) preserved as-is on save

Setup

npm install
npm run build

Run Tests

# Unit tests
npm run test

# E2E tests (VS Code extension host)
npm run test:e2e

# Manual preview
npm run preview

Setting as Default Editor

To use Htmly Editor as the default for all HTML files, add to your VS Code settings.json:

"workbench.editorAssociations": {
  "*.html": "htmly.editor",
  "*.htm": "htmly.editor"
}

Or open any HTML file and use "Reopen Editor With..." → "Htmly Editor" → "Set as default".

Key Files and Architecture

Extension Entry

• src/extension/extension.ts — VS Code extension activation, commands, settings, status bar

Webview UI

• webview/src/App.vue — Root component, mode switching, content change handling
• webview/src/components/TiptapEditor.vue — WYSIWYG editor using Tiptap
• webview/src/components/CodeEditor.vue — Source mode editor using CodeMirror
• webview/src/components/PreviewPane.vue — Preview iframe with device selector
• webview/src/components/SplitPane.vue — Split-screen layout with draggable divider
• webview/src/components/Toolbar.vue — Formatting toolbar with all buttons
• webview/src/components/BubbleMenu.vue — Floating selection toolbar
• webview/src/components/SearchBar.vue — Find/replace bar (WYSIWYG only)
• webview/src/components/LinkDialog.vue — Link insertion/edit dialog
• webview/src/extensions/dragHandle.ts — Drag-and-drop block reordering

Composables

• webview/src/composables/useVSCode.ts — VS Code webview API (postMessage, onDidChangeConfiguration)

Settings Reference