feat: make tab switch and line-start rebindable

[nicholasadamou]

Summary

Make tabs.next / tabs.prev and editor.lineStart rebindable via KEYBINDABLE + customCommands. Move Ctrl+Opt+B (line home) onto the global keymap so it works with the custom-command path.

Context

Remaining KEYBINDABLE leftovers from the druk→dune feature-gap pass. Rebased onto main after #54–#56 merged.

Test plan

• Unit/UI coverage in test/keybindings.test.tsx and existing test/line-edit.test.tsx Ctrl+Opt+B
• CI green on rebased tip

  

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

Summary by CodeRabbit

• New Features

  • Added configurable keyboard shortcuts for switching to the next or previous tab.
  • Added a configurable shortcut to move the cursor to the start of the current line.
  • Custom tab-switching shortcuts now take precedence over default key combinations.

• Bug Fixes

  • Improved keyboard handling so configured shortcuts consistently perform the expected actions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5edd8d3a-d3e8-4db3-bd6d-8f112946c648

📥 Commits

Reviewing files that changed from the base of the PR and between e11b377 and 748409b.

📒 Files selected for processing (4)

• src/app/commands/keybindings.ts
• src/app/keyboard.ts
• src/ui/editorKeymap.ts
• test/keybindings.test.tsx

---

📝 Walkthrough

Walkthrough

The change adds configurable commands for next tab, previous tab, and line-start navigation. Keyboard fallbacks now respect custom bindings. The conflicting editor shortcut was removed, and tests cover persistence and line-start behavior.

Changes

Configurable keyboard navigation

Layer / File(s)	Summary
Command registration and dispatch src/app/commands/keybindings.ts, src/app/keyboard.ts	Registers tabs.next, tabs.prev, and editor.lineStart. Maps these commands to tab switching and lineHome dispatch.
Fallback shortcut behavior src/app/keyboard.ts, src/ui/editorKeymap.ts	Adds the Ctrl+modified-B line-start fallback and makes tab fallbacks respect customized bindings. Removes the conflicting editor keymap handler.
Binding persistence and behavior tests test/keybindings.test.tsx	Verifies persistence of the new bindings and confirms that a custom line-start binding moves the cursor to column 1.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant useAppKeyboard
  participant lineOp
  participant EditorStatus
  User->>useAppKeyboard: Press custom editor.lineStart binding
  useAppKeyboard->>lineOp: Dispatch lineHome
  lineOp->>EditorStatus: Update cursor position
  EditorStatus-->>User: Show Ln 1, Col 1

Loading

Suggested reviewers: cursoragent

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/keybindable-tabs-linestart-15fc

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}