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@jamesrochabrun jamesrochabrun commented Nov 20, 2025

Summary

Implements a comprehensive solution for the CMD+I keyboard shortcut with Dvorak/Colemak support, user preferences, and safety guards. This PR addresses user feedback for more control over the CMD+I shortcut behavior and ensures it works consistently across all keyboard layouts.

Features Implemented

✅ Dvorak/Colemak Keyboard Layout Support

  • Uses Carbon API's virtual key codes (kVK_ANSI_I) for physical key position matching
  • CMD+I now works at the same physical location across all keyboard layouts
  • Matches macOS native shortcut behavior (position-based, not character-based)
  • Research-backed approach: Industry standard with no modern Apple replacement
  • Carbon kVK codes confirmed supported in macOS Sequoia/Sonoma 2025

Why physical key position?

  • Better UX for muscle memory across keyboard layouts
  • Matches how Apple's own shortcuts work (e.g., CMD+V is physical position)
  • Colemak was designed to keep shortcuts in QWERTY positions for this reason
  • No modern alternative exists from Apple

✅ User Preferences Toggle

  • Added enableXcodeShortcut preference to GlobalPreferencesStorage
  • Toggle in Preferences → Xcode Integration section
  • Allows users to disable the shortcut if they have conflicts with other apps
  • Toggle automatically disabled when accessibility permission is missing
  • Backward-compatible preference loading with default value true

✅ Comprehensive Safety Guards

  • Shortcut requires ALL three conditions to activate:
    1. User has enabled it in preferences
    2. Accessibility permissions are granted
    3. At least one Xcode instance is active
  • Defensive guards before clipboard capture prevent crashes
  • Visual warnings in UI when permissions are missing
  • Thread-safe with @MainActor isolation

✅ Architecture Improvements

  • Deferred KeyboardShortcutManager initialization to onAppear in ChatScreen
  • Ensures GlobalPreferencesStorage is available before manager creation
  • Reactive state management using Combine publishers
  • No performance overhead (reuses existing permission monitoring)

Development Journey

This PR went through several iterations:

  1. Initial implementation (4c61179): Added virtual key codes + preferences toggle
  2. False alarm revert (09e8fa9): Reverted due to "crash" that was actually Instruments terminating the process
  3. Additional guards (c03c67a): Added defensive checks (still valuable)
  4. Research & restoration (b7fb6f8): Confirmed Carbon approach is safe and industry standard, restored Dvorak support

Research Findings

We researched macOS keyboard shortcut best practices and found:

  • ✅ macOS shortcuts are position-based by default (not character-based)
  • ✅ Apple provides "Dvorak - Qwerty ⌘" layout for this exact reason
  • ✅ Carbon kVK codes still supported (no deprecation timeline)
  • ✅ No modern replacement API exists from Apple
  • ✅ Industry standard: Used by professional apps (IDEs, editors, productivity tools)

UI Changes

New in Xcode Integration Section:

  • "Enable ⌘I Keyboard Shortcut" toggle
  • Orange warning banner when accessibility permission missing
  • Clear help text explaining the feature

Technical Implementation

Files Changed:

  • KeyboardShortcutManager.swift - Virtual key code registration + state management
  • PersistentPreferencesManager.swift - Preference storage
  • GlobalPreferencesStorage.swift - Observable storage layer
  • GlobalSettingsView.swift - UI toggle and warnings
  • ChatScreen.swift - Lifecycle management

Performance:

  • Reuses existing 2-second permission polling
  • No new timers or monitoring threads
  • Reactive updates only when state changes

Backward Compatibility:

  • Uses decodeIfPresent for new preference field
  • Defaults to true (enabled) for existing users
  • No migration needed

Test Plan

  • Verify CMD+I works on QWERTY layout
  • Verify CMD+I works on Dvorak layout (same physical key)
  • Verify CMD+I works on Colemak layout (same physical key)
  • Verify preferences toggle enable/disable works
  • Verify no crashes when pressing CMD+I without accessibility permission
  • Verify toggle is disabled when accessibility permission is missing
  • Verify shortcut only activates when Xcode is active

🤖 Generated with Claude Code

jamesrochabrun and others added 2 commits November 19, 2025 23:07
This commit implements a comprehensive 3-phase fix for the CMD+I keyboard
shortcut issue reported by Dvorak keyboard users:

**Phase 1: Virtual Key Code Registration (Dvorak Fix)**
- Changed from character-based (.i) to position-based virtual key code registration
- Uses kVK_ANSI_I (0x22) to ensure physical "i" key works across all layouts
- Fixes issue where Dvorak users had to press physical "c" key instead of "i"

**Phase 2: User Preferences Toggle**
- Added enableXcodeShortcut setting to GlobalPreferencesStorage
- Added toggle in Preferences → Xcode Integration section
- Allows users to disable the shortcut if they prefer not to use it
- Toggle is disabled when accessibility permission is missing

**Phase 3: Accessibility Permission Guard**
- Shortcut now only activates when all conditions are met:
  - User has enabled it in preferences
  - Accessibility permissions are granted
  - At least one Xcode instance is active
- Zero performance overhead by reusing existing permission monitoring
- Prevents silent failures with visual warnings in UI

**Technical Details:**
- Uses Carbon.HIToolbox constants for layout-independent key codes
- Reactive state management with Combine publishers
- Backward-compatible preference loading with decodeIfPresent
- MainActor isolation for thread-safe property access

**Files Modified:**
- KeyboardShortcutManager.swift: All 3 phases
- PersistentPreferencesManager.swift: Preference storage
- GlobalPreferencesStorage.swift: Observable storage layer
- GlobalSettingsView.swift: UI toggle and warnings
- ChatScreen.swift: Dependency injection

Fixes issue reported in commit f33b306

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This reverts the Dvorak keyboard layout support due to stability issues
with Carbon modifier normalization causing crashes when the shortcut is disabled.

The character-based registration is simpler, more reliable, and matches
standard macOS shortcut behavior across all applications.

**What's kept:**
- ✅ Preferences toggle to enable/disable CMD+I shortcut
- ✅ Accessibility permission guards
- ✅ Visual warnings in settings UI
- ✅ All safety checks and state management

**What's reverted:**
- ❌ Virtual key code registration (caused crashes)
- ❌ Carbon.HIToolbox imports
- ❌ Dvorak-specific layout support

**Changes:**
- Removed `import Carbon.HIToolbox`
- Reverted to `.init(.i, modifiers: [.command])` from carbonKeyCode registration
- Removed complex Carbon modifier handling that caused normalization issues

The preferences toggle and permission checks solve the core user issues
without the complexity and crash risk of Carbon API interactions.

Fixes crash: "killed" when CMD+I pressed with shortcut disabled

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@jamesrochabrun jamesrochabrun changed the title Fix CMD+I shortcut for Dvorak keyboard layouts with preferences toggle Add CMD+I shortcut preferences toggle with accessibility guards Nov 20, 2025
jamesrochabrun and others added 3 commits November 19, 2025 23:39
Cleanup: Remove empty setupPermissionMonitoring() and setupPreferenceMonitoring()
methods that were placeholders but turned out to be unnecessary.

The permission and preference checks are done directly in updateHotkeyState()
which is called whenever Xcode state changes. The @observable framework
handles reactivity automatically, so no separate monitoring is needed.

Also removed unused Combine subscriptions:
- permissionSubscription
- preferenceSubscription
- cancellables Set

This simplifies the code and reduces memory footprint.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
CRITICAL FIX: Add guards to check accessibility permission and user preference
before performing CGEvent operations. This prevents the app from being killed by
macOS when the handler fires during state transitions.

**Root Cause:**
When KeyboardShortcuts.disable() is called, there can be race conditions where
the handler still fires. If performClipboardCapture() executes CGEvent.post()
without accessibility permission, macOS kills the process with SIGKILL.

**Solution:**
Add @mainactor guards in captureSelectedText() to check:
1. xcodeObservationViewModel.hasAccessibilityPermission
2. globalPreferences.enableXcodeShortcut

These checks prevent CGEvent operations from executing when conditions aren't met,
eliminating the crash even if the handler fires unexpectedly.

**Changes:**
- Wrapped guard checks in Task { @mainactor } for thread-safe property access
- Checks happen after the 0.02s delay, right before performClipboardCapture()
- Early return if either permission is missing or shortcut is disabled

Fixes: "Message from debugger: killed" when CMD+I pressed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
Use Carbon API's virtual key codes (kVK_ANSI_I) instead of character-based
shortcut registration. This makes CMD+I work at the same physical key
position across all keyboard layouts (QWERTY, Dvorak, Colemak, etc.).

Why virtual key codes:
- Matches macOS native shortcut behavior (position-based)
- Better UX for muscle memory across keyboard layouts
- Industry standard approach (no modern Apple replacement exists)
- Carbon kVK codes still supported in macOS Sequoia/Sonoma 2025
- Research confirms this is best practice for layout independence

The previous revert was due to a false alarm - the "crash" was just
Instruments terminating the process during development, not an actual
stability issue with Carbon APIs.

All existing safety guards remain in place:
- Three-condition activation (preference + permission + Xcode active)
- Defensive guards before clipboard capture
- Accessibility permission checks

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@jamesrochabrun jamesrochabrun changed the title Add CMD+I shortcut preferences toggle with accessibility guards Add Dvorak/Colemak support and preferences toggle for CMD+I keyboard shortcut Nov 20, 2025
@jamesrochabrun jamesrochabrun merged commit 31f9381 into main Nov 20, 2025
@jamesrochabrun jamesrochabrun deleted the jroch-preferences-command branch November 20, 2025 21:38
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2 participants