Code editor

RBS includes a complete web-based code editor that runs in your browser, connected directly to your RBS Server. No desktop app to install, no extensions to configure — open a browser, connect to your branch server, and start coding with full IDE features.

API for building your own integrations and a standalone code editor are coming soon. We’re working on a public API and SDK so you can build custom editor integrations, plugins, and workflows on top of the RBS platform. Stay tuned.

What’s included

Code editor

ReasonOS editor with syntax highlighting, autocomplete, split view, and multi-tab support.

Language servers

Full LSP support — autocomplete, hover, diagnostics, go-to-definition, rename, formatting, and more.

Integrated terminal

Multi-tab terminal connected to your RBS Server with port detection and auto-proxy.

Git integration

Stage, unstage, diff, blame, branch management, and inline gutter decorations — all built in.

AI assistant

AI coding agent with tool calling, streaming responses, reasoning display, and multi-agent teams.

Collaboration

Real-time co-editing, video meetings, screen sharing, team chat, and presence tracking.

Editor

The code editor is built on CodeMirror and supports editing files across your entire workspace.

Syntax highlighting

Syntax highlighting is supported for a wide range of languages:

Language	Extensions
JavaScript / TypeScript	`.js`, `.jsx`, `.ts`, `.tsx`, `.mjs`, `.cjs`
Python	`.py`
HTML	`.html`, `.htm`
CSS / SCSS / LESS	`.css`, `.scss`, `.less`
JSON	`.json`
Markdown	`.md`, `.markdown`
SQL	`.sql`
C / C++	`.c`, `.cpp`, `.h`, `.hpp`
RBS	`.rbs`
And more	`.go`, `.rs`, `.java`, `.kt`, `.rb`, `.php`, `.yaml`, `.xml`, `.sh`, `.tf`, `.proto`

Editor features

Feature	Description
Multi-tab editing	Open multiple files in tabs. Drag-and-drop to reorder. Middle-click to close.
Split view	Split the editor into two panes (`Cmd+\`) to view and edit files side by side.
Quick open	Fuzzy file finder (`Cmd+P`) — type a filename to open it instantly.
Find in file	`Cmd+F` to search within the current file with regex support.
Global search	`Cmd+Shift+F` for workspace-wide search with regex, case sensitivity, and glob filters.
Word wrap	Toggle word wrap in settings.
Code folding	Collapse and expand code blocks.
Bracket matching	Auto-close brackets, parentheses, and quotes.
Multiple selections	Rectangular selection and multiple cursor support.

Keyboard shortcuts

Shortcut	Action
`Cmd+S`	Save the current file.
`Cmd+P`	Quick open (fuzzy file finder).
`Cmd+F`	Find in current file.
`Cmd+Shift+F`	Global search across workspace.
`Cmd+Shift+G`	Toggle Git panel.
`Cmd+B`	Toggle file explorer sidebar.
`Cmd+\`	Toggle split editor.
Cmd+`	Toggle integrated terminal.

Language Server Protocol (LSP)

The editor connects to language servers running on the RBS Server for full IDE-grade intelligence. LSP servers are started automatically when you open a file in a supported language.

LSP features

Feature	Description
Autocomplete	Context-aware completions with documentation and snippets.
Hover information	Hover over any symbol to see its type, documentation, and signature.
Diagnostics	Real-time errors and warnings displayed inline and in the status bar.
Go to definition	Jump to the definition of any symbol.
Go to type definition	Jump to the type definition of a symbol.
Find references	Find all usages of a symbol across the workspace.
Document symbols	Browse the symbol outline of the current file.
Rename	Rename a symbol across all files in the workspace.
Code formatting	Format the entire document or a selection.
Signature help	See function parameter information as you type.
Code actions	Quick fixes and refactoring suggestions.

LSP status

The editor status bar shows the current LSP connection state:

LSP (green) — connected and working.
LSP (spinner) — connecting to the language server.
LSP (sync needed) — run rbs sync to install the language server.
LSP (red) — connection error.

Integrated terminal

The editor includes a multi-tab terminal connected directly to your RBS Server. All commands run on the server, not your local machine.

Terminal features

Feature	Description
Multi-tab	Open multiple terminal sessions in separate tabs.
Full PTY	A real pseudo-terminal — run interactive commands, vim, htop, etc.
Port detection	When a process starts listening on a port, the terminal detects it and can auto-open the built-in browser.
Resize	Drag the terminal border to resize. The PTY adjusts automatically.
Signals	Send `Ctrl+C` (SIGINT), SIGTERM, or SIGKILL to running processes.

Git integration

The editor has built-in Git support — no terminal commands needed for common workflows.

Git panel

Open the Git panel with Cmd+Shift+G to see:

Changed files — modified, added, deleted, untracked, and renamed files.
Inline diffs — expand any file to see a hunk-by-hunk diff.
Stage / unstage — click to stage or unstage individual files.
Stage all / unstage all — batch operations.
Discard changes — revert a file to its last committed state.

Git gutter

The editor gutter shows inline change indicators:

Green bar — added lines.
Blue bar — modified lines.
Red triangle — deleted lines.

Click a gutter indicator to see the original content and revert individual hunks.

Additional Git features

Feature	Description
Blame	See who last changed each line and when.
History	View the commit history for a file or the entire repo.
Branches	View and switch between branches.
Hunk revert	Revert individual hunks within a file, not just the whole file.

AI coding assistant

The editor includes an AI-powered coding agent that can read files, write code, run terminal commands, and reason through complex tasks.

Features

Feature	Description
Streaming chat	Chat with the AI agent. Responses stream in real-time.
Tool calling	The agent can read and write files, run terminal commands, and search the codebase.
Thinking / reasoning	See the agent’s chain-of-thought reasoning as it works through your request.
Context files	Attach specific files to your prompt so the agent has full context.
Multi-agent teams	Spawn a team of specialized agents (frontend, backend, reviewer, tester, etc.) that collaborate on a task.
Configurable	Set your own API key and choose your preferred model.

Opening the AI assistant

Click the AI tool in the top navigation bar, or it can be opened via the tools menu. The AI panel opens on the right side of the editor.

Built-in web browser

The editor includes a built-in web browser for testing web applications without leaving the editor.

Features

Feature	Description
Port proxy	The RBS Server proxies local ports so you can preview your app in the embedded browser.
Auto-open	When the terminal detects a new port (e.g., a dev server starting), the browser opens automatically.
Navigation	Full browser controls — back, forward, refresh, URL bar.

Collaboration

When multiple developers connect to the same branch server, the editor provides real-time collaboration features — no third-party tools required.

Real-time editing

Edit the same file simultaneously with teammates. OT-based conflict resolution, remote cursors, and selection highlighting.

Video meetings

Peer-to-peer video calls with camera and screen sharing directly inside the editor. WebRTC — no third-party servers.

Team chat

Chat rooms with code snippet sharing, file references, typing indicators, and message history.

Presence

See who’s online, what file they’re viewing, who’s in a meeting, and who’s in a chat session.

Collaborative editing details

Operational Transformation (OT) — the same technique used by Google Docs. One op in flight at a time, with server-side transformation for consistency.
Remote cursors and selections — each user gets a distinct color. Cursor positions are updated automatically when remote edits shift content.
Editing region awareness — visual indicators show which lines each user is actively editing.
Conflict warnings — the system warns when two users edit overlapping regions.
Split-view support — each split pane is an independent collaboration participant.

Status bar

The editor status bar shows:

Collab button — toggle collaborative editing on/off. Shows the number of connected peers.
LSP status — current language server connection state.
File encoding — UTF-8 by default.
Git changes count — number of uncommitted changes.

Learn more about collaboration

See the full collaboration feature set: real-time editing, video, screen sharing, chat, and presence tracking.

File explorer

The left sidebar provides a file explorer with:

Feature	Description
Lazy loading	Directories are loaded on demand for fast initial load.
Streaming	Large repos use SSE-based streaming so the explorer populates incrementally.
File operations	Create, rename, delete, copy, and move files and folders.
Presence dots	Colored dots next to files indicate which teammates are viewing or editing them.

Toggle the file explorer with Cmd+B or from the status bar.

Tool pane

The right side of the editor hosts a tool pane for AI, browser, meetings, and chat. Tools are opened from the Tools menu in the top navigation bar and can be opened/closed independently.

Tool	Description
AI	AI coding assistant with streaming chat and tool calling.
Browser	Built-in web browser for previewing web apps.
Meeting	Video meeting with camera, mic, and screen share controls.
Chat	Team chat rooms with code sharing and typing indicators.

Coming soon

We’re building a public API and SDK for custom integrations. This will allow you to:

Build custom editor plugins and extensions.
Connect external tools to the RBS Server programmatically.
Automate workflows using the RBS API.
Integrate with your own internal development tools.

If you’re interested in early access, reach out to support@reasonos.dev.

​Code editor

​What’s included

Code editor

Language servers

Integrated terminal

Git integration

AI assistant

Collaboration

​Editor

​Syntax highlighting

​Editor features

​Keyboard shortcuts

​Language Server Protocol (LSP)

​LSP features

​LSP status

​Integrated terminal

​Terminal features

​Git integration

​Git panel

​Git gutter

​Additional Git features

​AI coding assistant

​Features

​Opening the AI assistant

​Built-in web browser

​Features

​Collaboration

Real-time editing

Video meetings

Team chat

Presence

​Collaborative editing details

​Status bar

Learn more about collaboration

​File explorer

​Tool pane

​Coming soon

Code editor

What’s included

Editor

Syntax highlighting

Editor features

Keyboard shortcuts

Language Server Protocol (LSP)

LSP features

LSP status

Integrated terminal

Terminal features

Git integration

Git panel

Git gutter

Additional Git features

AI coding assistant

Features

Opening the AI assistant

Built-in web browser

Features

Collaboration

Collaborative editing details

Status bar

File explorer

Tool pane

Coming soon