feat: JSON ↔ TOON bidirectional converter with syntax highlighting and validation

.node-version

@@ -0,0 +1 @@
+22

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Run Extension",
+      "type": "extensionHost",
+      "request": "launch",
+      "args": [
+        "--extensionDevelopmentPath=${workspaceFolder}"
+      ],
+      "outFiles": [
+        "${workspaceFolder}/dist/**/*.mjs"
+      ],
+      "preLaunchTask": "npm: build"
+    }
+  ]
+}

.vscodeignore

@@ -8,6 +8,10 @@ src/
 .gitignore
 eslint.config.mjs
 pnpm-lock.yaml
+pnpm-workspace.yaml
 tsconfig.json
-*.md
-!README.md
+tsdown.config.ts
+CONTRIBUTING.md
+**/*.map
+**/*.ts
+!dist/**

CHANGELOG.md

@@ -0,0 +1,17 @@
+# Changelog
+
+## 0.1.0
+
+Initial release.
+
+### Features
+
+- Bidirectional JSON/JSONC to TOON conversion
+- Selection-aware conversion in any file type
+- Explorer context menu for file-to-file conversion with save dialog
+- Editor context menu when text is selected
+- Keyboard shortcuts: `Cmd+Alt+T` / `Ctrl+Alt+T` (to TOON), `Cmd+Alt+J` / `Ctrl+Alt+J` (to JSON)
+- TextMate grammar for `.toon` syntax highlighting
+- Real-time TOON validation with diagnostics in the Problems panel
+- Configurable encoding options (indent, delimiter, key folding)
+- Configurable decoding options (path expansion)

README.md

@@ -1,77 +1,88 @@
-# TOON Format for Visual Studio Code
+# TOON — JSON ↔ TOON Converter for VS Code
 
-> **⚠️ Development Status:** This extension is in early development. Bare minimum setup for team collaboration.
+Bidirectional conversion between JSON and [TOON](https://toonformat.dev) (Token-Oriented Object Notation), with syntax highlighting and real-time validation.
 
-Visual Studio Code extension for TOON format support. TOON is a compact, human-readable serialization format for LLM contexts with 30-60% token reduction vs JSON.
+TOON is a compact, human-readable format that achieves ~40% fewer tokens than JSON while maintaining lossless, deterministic round-trips. Designed for LLM contexts where every token has a cost.
 
 ## Features
 
-Currently in development. Planned features:
+- **Bidirectional conversion** — Convert JSON/JSONC to TOON and back
+- **Selection-aware** — Select text in any file to convert just that fragment
+- **Context menu** — Right-click `.json` or `.toon` files in the explorer
+- **Keyboard shortcuts** — `Cmd+Alt+T` (to TOON), `Cmd+Alt+J` (to JSON)
+- **Syntax highlighting** — Full TextMate grammar for `.toon` files
+- **Real-time validation** — Errors appear in the Problems panel as you type
+- **Configurable** — Indent size, delimiter style, key folding, path expansion
 
-- Syntax highlighting for `.toon` files
-- Format validation and error detection
-- Code formatting and auto-completion
-- Integration with TOON specification
+## Usage
 
-## Installation
+### Convert in the editor
 
-This extension is not yet published to the Visual Studio Marketplace. To install locally:
+1. Open a `.json` file
+2. Press `Cmd+Alt+T` (Mac) or `Ctrl+Alt+T` (Windows/Linux)
+3. The file content is replaced with TOON and the language mode switches
 
-```bash
-git clone https://github.com/toon-format/vscode.git
-cd toon-vscode
-pnpm install
-pnpm build
-```
+To convert back: open the `.toon` file and press `Cmd+Alt+J` / `Ctrl+Alt+J`.
 
-## Development
+### Convert a selection
 
-```bash
-# Setup
-git clone https://github.com/toon-format/vscode.git
-cd toon-vscode
-pnpm install
+Select any JSON or TOON text in any file (`.md`, `.txt`, etc.) and:
+- Right-click → "Convert JSON to TOON" or "Convert TOON to JSON"
+- Or use the keyboard shortcuts
 
-# Build
-pnpm build
+### Save as a new file
 
-# Development mode (watch)
-pnpm dev
+Right-click a `.json` file in the Explorer → "Convert to TOON (Save As...)"
+Right-click a `.toon` file in the Explorer → "Convert to JSON (Save As...)"
 
-# Run linting
-pnpm lint
+A save dialog appears so you choose the output location.
 
-# Type check
-pnpm test:types
+### Command Palette
 
-# Package extension
-pnpm package
-```
+All commands are available via `Cmd+Shift+P`:
+- `Convert JSON to TOON`
+- `Convert TOON to JSON`
+- `Convert to TOON (Save As...)`
+- `Convert to JSON (Save As...)`
 
-## Project Status & Roadmap
+## Settings
 
-Following semantic versioning towards 1.0.0:
+| Setting | Default | Description |
+|---------|---------|-------------|
+| `toon.encode.indent` | `2` | Indentation size for TOON output |
+| `toon.encode.delimiter` | `,` | Delimiter for tabular arrays (`,`, `\|`, `\t`) |
+| `toon.encode.keyFolding` | `off` | Dotted key folding (`off` or `safe`) |
+| `toon.decode.expandPaths` | `off` | Expand dotted keys on decode (`off` or `safe`) |
+| `toon.json.indent` | `2` | Indentation size for JSON output |
+| `toon.openAfterConvert` | `true` | Open converted file after saving |
+| `toon.validation.enable` | `true` | Enable real-time validation in Problems panel |
 
-- **v0.0.x** - Initial project setup, bare minimum structure (current)
-- **v0.1.x** - Basic syntax highlighting and file recognition
-- **v0.2.x** - Format validation and error detection
-- **v0.3.x** - Code formatting and auto-completion
-- **v1.0.0** - First stable release with full TOON format support
+## Development
+
+Requires Node.js 22+ for build tooling.
 
-See [CONTRIBUTING.md](CONTRIBUTING.md) for detailed guidelines.
+```bash
+git clone https://github.com/akumarpalo/vscode.git
+cd vscode
+pnpm install
+pnpm build
+```
 
-## Documentation
+Press F5 in VS Code to launch the Extension Development Host.
 
-- [📜 TOON Specification](https://github.com/toon-format/spec) - Official specification
-- [🐛 Issues](https://github.com/toon-format/vscode/issues) - Bug reports and features
-- [🤝 Contributing](CONTRIBUTING.md) - Contribution guidelines
+```bash
+pnpm dev          # Watch mode
+pnpm lint         # Lint
+pnpm test:types   # Type check
+pnpm package      # Build .vsix
+```
 
-## Related Projects
+## Links
 
-- [toon](https://github.com/toon-format/toon) - TypeScript implementation
-- [toon-python](https://github.com/toon-format/toon-python) - Python implementation
-- [toon-rust](https://github.com/toon-format/toon-rust) - Rust implementation
+- [TOON Specification](https://github.com/toon-format/spec)
+- [TOON TypeScript Library](https://github.com/toon-format/toon)
+- [Issues](https://github.com/akumarpalo/vscode/issues)
 
 ## License
 
-MIT License – see [LICENSE](LICENSE) for details
+MIT

language-configuration.json

@@ -0,0 +1,24 @@
+{
+  "brackets": [
+    ["[", "]"],
+    ["{", "}"]
+  ],
+  "autoClosingPairs": [
+    { "open": "{", "close": "}" },
+    { "open": "[", "close": "]" },
+    { "open": "\"", "close": "\"", "notIn": ["string"] }
+  ],
+  "surroundingPairs": [
+    { "open": "{", "close": "}" },
+    { "open": "[", "close": "]" },
+    { "open": "\"", "close": "\"" }
+  ],
+  "folding": {
+    "offSide": true
+  },
+  "indentationRules": {
+    "increaseIndentPattern": "^.+:\\s*$",
+    "decreaseIndentPattern": "^\\s*$"
+  },
+  "wordPattern": "[^\\s,:\\[\\]{}\"']+"
+}