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[PR #5983] fix(tui): resize textarea if text inserted via appendPrompt TUI API #11683

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opened 2026-02-16 18:16:36 -05:00 by yindo · 0 comments
yindo commented 2026-02-16 18:16:36 -05:00
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Original Pull Request: https://github.com/anomalyco/opencode/pull/5983

State: closed
Merged: Yes

Closes #5664

Problem

When using appendPrompt to insert multi-line text, the textarea doesn't expand to show all lines. Users only see the last line with the cursor, while earlier lines are hidden above the viewport.

Use Case

This enables plugins to create new sessions with pre-filled prompts.

For example, my opencode-handoff plugin that emulates Amp's /handoff command generates a full handoff prompt to insert into a new session. Before this fix, I could only reliably get the textarea sized correctly by calling appendPrompt twice, once before the "session_new" command and once after:

await client.tui.clearPrompt()
await new Promise(r => setTimeout(r, 100))
await client.tui.appendPrompt({ body: { text: fullPrompt } })
await client.tui.executeCommand({ body: { command: "session_new" } })
await client.tui.clearPrompt()
await new Promise(r => setTimeout(r, 100))
await client.tui.appendPrompt({ body: { text: fullPrompt } })

https://github.com/joshuadavidthomas/opencode-handoff/blob/34a76b2f1e2cd4f024b88196c81fba09e6e1714a/src/tools.ts#L35-L45

After this fix, it can be simplified to this and the re-sizing works:

await client.tui.executeCommand({ body: { command: "session_new" } })
await client.tui.appendPrompt({ body: { text: fullPrompt } })

Details

The insertText() method in opentui doesn't trigger yoga layout recalculation. Calling markDirty() synchronously doesn't work - yoga needs the insert to fully complete first. Deferring via setTimeout(..., 0) allows internal state to settle before recalculating layout.

Alternatives

TBH, for my specific use-case a cleaner approach would be exposing a way for plugins to create a new session with a pre-filled prompt directly. However, that potentially would require:

  • Adding the parameter to Session.create API
  • Modifying /tui/execute-command to accept parameters
  • Wiring the prompt population and textarea sizing

Which is a much bigger change than I'm prepared to make, as it would almost certainly require discussion and maintainer buy-in. This PR just fixes an existing bug - appendPrompt should resize the textarea but doesn't. The fix happens to enable my plugin use case, but it stands on its own merit: if you call appendPrompt with multi-line text, the textarea should expand to show it.

If there's interest in enabling session creation with a pre-filled prompt, I'm happy to open an issue to continue the discussion.

**Original Pull Request:** https://github.com/anomalyco/opencode/pull/5983 **State:** closed **Merged:** Yes --- Closes #5664 #### Problem When using `appendPrompt` to insert multi-line text, the textarea doesn't expand to show all lines. Users only see the last line with the cursor, while earlier lines are hidden above the viewport. #### Use Case This enables plugins to create new sessions with pre-filled prompts. For example, my [opencode-handoff](https://github.com/joshuadavidthomas/opencode-handoff) plugin that emulates Amp's `/handoff` command generates a full handoff prompt to insert into a new session. Before this fix, I could only reliably get the textarea sized correctly by calling `appendPrompt` twice, once before the `"session_new"` command and once after: ```typescript await client.tui.clearPrompt() await new Promise(r => setTimeout(r, 100)) await client.tui.appendPrompt({ body: { text: fullPrompt } }) await client.tui.executeCommand({ body: { command: "session_new" } }) await client.tui.clearPrompt() await new Promise(r => setTimeout(r, 100)) await client.tui.appendPrompt({ body: { text: fullPrompt } }) ``` https://github.com/joshuadavidthomas/opencode-handoff/blob/34a76b2f1e2cd4f024b88196c81fba09e6e1714a/src/tools.ts#L35-L45 After this fix, it can be simplified to this and the re-sizing works: ```typescript await client.tui.executeCommand({ body: { command: "session_new" } }) await client.tui.appendPrompt({ body: { text: fullPrompt } }) ``` #### Details The `insertText()` method in opentui doesn't trigger yoga layout recalculation. Calling `markDirty()` synchronously doesn't work - yoga needs the insert to fully complete first. Deferring via `setTimeout(..., 0)` allows internal state to settle before recalculating layout. #### Alternatives TBH, for my specific use-case a cleaner approach would be exposing a way for plugins to create a new session with a pre-filled prompt directly. However, that potentially would require: - Adding the parameter to `Session.create` API - Modifying `/tui/execute-command` to accept parameters - Wiring the prompt population and textarea sizing Which is a much bigger change than I'm prepared to make, as it would almost certainly require discussion and maintainer buy-in. This PR just fixes an existing bug - `appendPrompt` should resize the textarea but doesn't. The fix happens to enable my plugin use case, but it stands on its own merit: if you call `appendPrompt` with multi-line text, the textarea should expand to show it. If there's interest in enabling session creation with a pre-filled prompt, I'm happy to open an issue to continue the discussion.
yindo added the pull-request label 2026-02-16 18:16:36 -05:00
yindo closed this issue 2026-02-16 18:16:36 -05:00
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Reference: anomalyco/opencode#11683
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