opencode-selection

Send selected code or file references from VS Code to the OpenCode terminal with a single shortcut.

A lightweight VS Code extension that bridges your editor to the OpenCode terminal. Select code (or place your cursor on a line), press Cmd+L (Mac) or Ctrl+L (Windows/Linux), and the context is sent to the OpenCode prompt — no copy-paste needed.

Built by Sunstone Apps.

OpenCode Selection demo

How it works

The extension inspects your current selection and decides what to send:

Scenario	What gets sent
File in workspace + selection	`@path#Lstart-end` (compact reference)
File in workspace + no selection	`@path` (file reference)
Untitled or out-of-workspace file	Sanitized text (tabs and newlines collapsed, wrapped in backticks if multiline)

Workspace files become references — the OpenCode agent reads the file directly, so your prompt stays clean. Unsaved or external files fall back to sanitized text since there's no path to reference.

Why

The official OpenCode VS Code extension only sends file references for files inside the workspace folder. This extension adds the missing piece: send any selection to the OpenCode prompt, including unsaved files or files outside the project — and sends workspace selections as compact @path#L references instead of raw text.

Requirements

OpenCode installed and available in your PATH
The official OpenCode VS Code extension (provides Cmd+Esc to open the OpenCode terminal)

Install

From the VS Code Marketplace

Install directly from the Marketplace page or via the command line:

code --install-extension sunstoneapps.opencode-selection

From source (local development)

git clone https://github.com/JonathanReisCom/opencode-selection.git
cd opencode-selection

Then in VS Code:

Open the opencode-selection folder
Press F5 to launch an Extension Development Host
Open the OpenCode terminal with Cmd+Esc (Mac) or Ctrl+Esc (Windows/Linux)
Select code in any file and press Cmd+L / Ctrl+L

Manual install (without building)

Copy the extension folder into your VS Code extensions directory:

cp -r . ~/.vscode/extensions/sunstoneapps.opencode-selection-0.1.2

Restart VS Code.

Usage

Open the OpenCode terminal with Cmd+Esc (this creates a terminal named "opencode")
Select code in any editor (or place your cursor on a line)
Press Cmd+L (Mac) or Ctrl+L (Windows/Linux)
The reference or sanitized text appears in the OpenCode prompt, ready for you to type your question

How it sends data

When the OpenCode terminal is created via the official extension, it registers a local HTTP port in the terminal's environment variables. This extension reads that port and sends the payload via POST http://localhost:<port>/tui/append-prompt.

If the port is not available (e.g., the terminal was opened manually), it falls back to terminal.sendText() which types the text directly into the terminal.

Limitations

Depends on the OpenCode terminal being created via Cmd+Esc (the official extension's command). A manually opened opencode terminal won't have the HTTP port registered.
The /tui/append-prompt endpoint and _EXTENSION_OPENCODE_PORT environment variable are internal APIs of the OpenCode VS Code extension — they may change between releases.

OpenCode Selection

Sunstone Apps