[FEATURE]: Allow changing cursor style from block to bar/line

[aree6]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Opencode's TUI has a default block cursor, it would be really nice to have bar/line cursor (like |) also.
Even better would be an option to just use whatever cursor style my terminal is already configured with.

Current behavior

• In regular Ghostty: cursor is a bar | ✓
• In opencode TUI: cursor is a block █ (overrides my terminal setting)

I tried adding shell-integration-features = no-cursor in addition to cursor-style = bar to my Ghostty config as suggested in Ghostty discussions, but opencode still shows a block cursor.

What would be nice

Options to choose between:

• Block (current default)
• Bar/line (my preference)
• Underline (bonus)
• Terminal default (use whatever the terminal is configured with)

Technical details (discovered with AI assistance)

Note: The following technical analysis was done with the help of an AI assistant exploring the opencode codebase

Why this happens:
Opencode uses the charmbracelet/bubbles library for its TUI components. The cursor is hardcoded to "block" style in that library using color inversion (Reverse(true)).

Relevant code locations:

1. Upstream dependency - charmbracelet/bubbles/cursor/cursor.go

   • The cursor rendering uses Reverse(true) to create the block effect
   • https://github.com/charmbracelet/bubbles/blob/master/cursor/cursor.go

2. Opencode usage - internal/tui/components/chat/editor.go

   • Creates the textarea component using bubbles with default cursor settings
   • https://github.com/anomalyco/opencode/blob/main/internal/tui/components/chat/editor.go

Possible approaches:

1. Request the upstream charmbracelet/bubbles library add support for different cursor shapes
2. Implement a custom cursor component in opencode that supports block/bar/underline styles
3. Support DECSCUSR escape sequences for terminals that handle cursor styling natively

Similar issues in other projects

This isn't unique to opencode - other TUI apps have faced similar cursor override issues:

• Claude Code: Has a similar issue where it overrides terminal cursor settings

  • Cursor Style Interference: Claude Overrides Terminal Cursor Behavior anthropics/claude-code#674

• Ghostty discussions: Multiple users have reported cursor style being overridden by TUI applications

  • `cursor-style` configuration not working ghostty-org/ghostty#5144
  • Cursor block style sometimes become a line ghostty-org/ghostty#3893

Related opencode issues

• Cursor blinking issue: Terminal cursor blinks in opencode even though it shouldn't
  • Terminal cursor blinks in opencode even though it shouldn't #1905

Environment

• Terminal: Ghostty
• Config tried: cursor-style = bar + shell-integration-features = no-cursor
• Result: Still seeing block cursor in opencode TUI

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Thanks for considering this! Let me know if you need any more info.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• feat: add configurable cursor style for TUI textareas #11305: feat: add configurable cursor style for TUI textareas (virtually identical feature request with same proposed solution)
• Cursor does not reset in some terminals #11433: Cursor does not reset in some terminals (related cursor reset issue)
• Terminal cursor blinks in opencode even though it shouldn't #1905: Terminal cursor blinks in opencode even though it shouldn't (related cursor behavior)
• [FEATURE]: Non-blinking caret / cursor #5364: Non-blinking caret / cursor (related cursor control request)

Feel free to ignore if none of these address your specific case.

[Chi-teck]

aree6 closed this as completed

Is it really comleted?

[Chi8wah]

so how to change the cursor style in tui?

[dangooddd]

@kommander Hello. This issue is still relevant, can we reopen it?

[kekscode]

Yes, please reopen or update docs on how to configure this if the code is actually integrated and working, please.

[dangooddd]

I have created PR with this feature and plan to support it till the merge. Please test PR locally if you have time (and provide feedback), as OpenCode team seems to face really big amount PRs