AbysiusCodium

A custom, releasable VSCodium distribution built from Microsoft's open-source VS Code repository, bundled with the Abysius AI extension for intelligent inline code completions and an embedded AI chat interface.

Features

• Inline Code Completions: Ghost-text suggestions powered by Abysius AI models as you type
• AI Chat Panel: Conversational assistant integrated directly into the editor sidebar
• Privacy-First: Built on VSCodium — no Microsoft telemetry, no proprietary licensing
• Custom Branding: Fully branded as Abysius Codium with its own identity
• Cross-Platform: Builds for Linux, macOS, and Windows (x64, ARM64, ARM HF)
• OSS Extension Marketplace: Uses Open VSX by default

Project Structure

AbysiusCodium/
|-- .github/workflows/       # CI/CD pipelines (GitHub Actions)
|-- build/
|   |-- build.sh             # Main build script for VSCodium binaries
|   |-- dev-setup.sh         # Local extension dev environment setup
|-- extensions/
|   |-- abysius-ai/          # The Abysius AI VS Code extension
|       |-- src/
|       |   |-- extension.ts         # Main activation entry point
|       |   |-- api.ts               # Abysius API client (inline + chat)
|       |   |-- inlineCompletion.ts  # Ghost-text completion provider
|       |   |-- chatPanel.ts         # Webview chat panel provider
|       |-- assets/
|       |   |-- chat.css             # Chat UI styles
|       |   |-- chat.js              # Chat UI logic (webview)
|       |-- package.json             # Extension manifest
|       |-- tsconfig.json            # TypeScript config
|-- patches/                 # Patches applied to vscode source
|-- product.json             # Abysius branding & built-in extensions config
|-- package.json             # Root project scripts
|-- README.md

Quick Start

Prerequisites

• Node.js 20+ (use nvm or fnm)
• Git
• Platform-specific build tools (see below)

Linux Build

# Install deps (Ubuntu/Debian)
sudo apt-get install libx11-dev libxkbfile-dev libsecret-1-dev fakeroot rpm

# Clone and build
git clone https://github.com/AbysiusAI/AbysiusCodium.git
cd AbysiusCodium
./build/build.sh --platform linux --arch x64

macOS Build

# Xcode Command Line Tools required
xcode-select --install

# Build
git clone https://github.com/AbysiusAI/AbysiusCodium.git
cd AbysiusCodium
./build/build.sh --platform darwin --arch arm64

Windows Build

# From Git Bash or WSL
git clone https://github.com/AbysiusAI/AbysiusCodium.git
cd AbysiusCodium
bash build/build.sh --platform win32 --arch x64

Extension-Only Development

To work on just the Abysius AI extension without building the full editor:

cd AbysiusCodium
./build/dev-setup.sh

This symlinks the extension into your local VS Code / VSCodium installation for live testing.

Abysius AI Extension

Inline Completions

• Triggered automatically as you type (debounced, configurable delay)
• Accept full completion with Tab
• Accept word-by-word with Ctrl+Right / Cmd+Right
• Reject with Escape
• Manual trigger with Ctrl+Space / Cmd+Space

Chat Interface

• Open from the Activity Bar or via Command Palette (Abysius: Open Chat)
• Streaming responses in real-time
• Code blocks have Copy and Insert actions
• Context-aware: knows your current file language, selection, and cursor position

Configuration

Architecture

How It Works

1. Build: build.sh clones the VS Code upstream repo at the specified tag
2. Patch: De-branding patches are applied to remove Microsoft-specific code
3. Inject: product.json is copied in, defining Abysius branding and built-in extensions
4. Bundle: The abysius-ai extension is compiled and installed as a built-in extension
5. Compile: VS Code's standard build pipeline produces platform-specific binaries
6. Package: OS-specific packages (.tar.gz, .deb, .rpm, .dmg, .zip, .exe) are created

Extension API Design

The extension uses four VS Code API surfaces:

• InlineCompletionItemProvider: Provides ghost-text suggestions via provideInlineCompletionItems
• WebviewViewProvider: Hosts the chat UI in a sidebar panel
• Chat Participants: Uses the chatParticipant API proposal for @-mention support
• Language Model API: Direct programmatic access to models for custom features

The API client (src/api.ts) supports both streaming (chat) and request/response (inline) patterns. Endpoints are configurable so you can point to self-hosted or third-party model backends.

Releasing

1. Tag a release: git tag -a v1.0.0 -m "Release v1.0.0"
2. Push tags: git push origin v1.0.0
3. GitHub Actions builds for all platforms and creates a draft release
4. Review the draft release, add notes, publish

Development Scripts

# Watch extension TypeScript for changes
npm run dev:ext

# Build extension once
npm run build:ext

# Package extension as .vsix
npm run package:ext

# Build full editor for current platform
npm run build:linux   # or build:darwin / build:win32

# Clean all build artifacts
npm run clean

# Lint extension
npm run lint:ext

Customizing the AI Backend

By default, the extension points to https://api.abysius.ai. To use your own backend:

1. Update abysius.chatEndpoint and abysius.inlineEndpoint in settings
2. Your backend should accept OpenAI-compatible request/response formats:Inline Endpoint (POST /v1/inline):

   {
     "prompt": "code before cursor",
     "suffix": "code after cursor",
     "language": "typescript",
     "filename": "test.ts",
     "model": "your-model",
     "max_tokens": 200
   }

   Response:

   { "completion": "suggested code here", "finish_reason": "stop" }

   Chat Endpoint (POST /v1/chat): OpenAI-compatible chat completions with stream: true/false support.

License

MIT — see LICENSE

Acknowledgments

• Built on VSCodium and Microsoft's vscode open-source project
• Inline completions leverage VS Code's InlineCompletionItemProvider API
• Chat UI built with VS Code Webview API