tui: whitespace-preceded "/" opens autocomplete and blocks prompt submission #50604

Description

In the TUI, any / that is preceded by whitespace opens the slash-command autocomplete and swallows Enter, so the prompt can never be submitted. It does not require the text to be a command — a normal sentence containing a spaced / is affected.

Because command options are only listed when the / is at offset 0, the popup just shows "No matching commands" mid-message, and Enter does nothing. It also happens when the spaced token is an actual command name.

Messages that cannot be sent, for example:

• Do not use 'find /'
• run /devices

A / should only be treated as a command when it is the first character of the prompt. The submit path already requires this (parseSlashHead returns early unless text.startsWith("/")), and the docs describe commands as starting with / ("Type / to list slash commands"), so the whitespace-preceded trigger is neither documented nor consistent with submission.

Steps to reproduce

1. Open the TUI (opencode) in any project.
2. Type a message containing a space followed by /, e.g. Do not use 'find /'.
3. The autocomplete popup opens with "No matching commands".
4. Press Enter. The message is not submitted; nothing happens.

Expected: the message submits normally. Actual: the popup opens and Enter is consumed by the autocomplete, so the prompt cannot be sent.

Notes

Likely source, on v2.0.13:

• packages/tui/src/prompt/display.ts — slashTriggerIndex accepts a / whose preceding character is whitespace, anywhere in the prompt.
• packages/tui/src/component/prompt/autocomplete.tsx — the autocomplete layer is enabled whenever that popup is visible and binds Enter to prompt.autocomplete.select; command options are gated on store.index === 0, so mid-message the list is empty and select() returns without submitting.

The dev branch looks already changed here (the trigger now requires value.startsWith("/") with no whitespace before the cursor), but v2.0.13 is the latest release and still has this behavior.

OpenCode version

2.0.13

Plugins

-opencode-pty, cc-safety-net@latest; local plugins devices, opencode-stats, ssh-remote

Operating System

Linux (Ubuntu on WSL2, x64) — kernel 5.15.153.1-microsoft-standard-WSL2

Terminal

WSL2 terminal, TERM=xterm-256color