Editor

The editor is a full CodeMirror 6 stack mounted as one instance per tab. Like terminals, editor tabs are not unmounted on switch - cursor positions, undo history, and selections persist across the whole session.

Languages

CodeMirror language modes for TypeScript / JavaScript, Rust, Python, Go, C / C++, Java, HTML / CSS, JSON, Markdown, and the long tail of common formats. Mode is detected from the file extension.

Vim mode

First-class. The vim CodeMirror extension - motions, registers, marks, visual modes, and : command line. Toggle in Settings -> General.

Inline AI autocomplete

Type. After a short pause Terax queries your configured autocomplete provider and renders the suggestion inline. Accept with Tab, reject by typing anything else.

Provider and model are independent of your main chat model. Configure in Settings -> Models. The autocomplete provider can be any cloud provider or a local LM Studio / MLX / Ollama endpoint, since latency matters more than raw quality here.

Disable entirely with the autocompleteEnabled toggle.

AI edit diffs

When the AI agent proposes a file edit, Terax does not write it directly. It opens an ai-diff tab showing the proposed change side by side with the current file. You accept or reject hunk by hunk, then the actual write tool runs against the accepted result.

This is the same mechanism whether the change came from the main agent, a sub-agent, or a custom agent.

Editor themes

Ten bundled syntax themes, independent of the app theme:

• Atom One
• Aura
• Copilot
• GitHub Dark / Light
• Gruvbox Dark
• Nord
• Tokyo Night
• Xcode Dark / Light

Pick one in Settings -> Themes. Editor theme picks separately from the app palette - dark editor on light app is fine.

Shortcuts

CodeMirror's native key bindings handle the rest. Terax registers the editor entries in the shortcuts dialog for discoverability but does not intercept them at the app level.