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Phase 4 Dual-Cursor Implementation Status

COMPLETED WORK ✅

Phase 1: Script Detection (COMMITTED)

  • Commit: 97467f8
  • File: src/script-detection.ts (NEW)
  • Features:
    • Unicode range detection for Arabic, Syriac, N'Ko
    • Context-aware detection for neutral characters
    • Excludes Arabic punctuation (comma, semicolon, etc.)
    • Spaces/whitespace always treated as word boundaries

Phase 2: Word Boundary Detection (COMMITTED)

  • Commit: 1b68e0a
  • File: src/word-boundary.ts (NEW)
  • Features:
    • Finds connected Arabic word boundaries
    • Simple algorithm: stops at non-Arabic characters
    • Performance: ±50 character search range

Phase 3: Context-Aware Cursor (COMMITTED)

  • Commit: a26c13a
  • File: src/block-cursor.ts (MODIFIED)
  • Features:
    • Latin text (focused): opaque cursor with visible text ✅ TESTED
    • Arabic text (focused): transparent cursor ✅ TESTED
    • Unfocused: outline cursor for both

Phase 4: Dual-Cursor (IMPLEMENTED BUT NOT COMMITTED)

  • Files modified:
    • src/block-cursor.ts - major changes
    • src/script-detection.ts - punctuation refinements
  • Status: WORKING AND TESTED ✅
  • Last build: 18:22 (Nov 10)

UNCOMMITTED CHANGES (READY TO COMMIT)

1. Update to script-detection.ts

What changed:

  • Refined Arabic punctuation detection to exclude only word breakers
  • Diacritics (U+064B-U+065F) now correctly treated as part of letters
  • Spaces/whitespace explicitly excluded from connected script detection

Key code:

// Spaces and whitespace should NEVER be treated as connected script
if (char === ' ' || char === '\t' || char === '\n' || char === '\r') {
  return { type: ScriptType.LATIN, requiresSpecialCursor: false, isConnectedScript: false };
}

// Arabic punctuation (word breakers only)
const isArabicPunctuation = codePoint === 0x060C || // comma
                             codePoint === 0x061B || // semicolon
                             codePoint === 0x061F || // question mark
                             codePoint === 0x06D4 || // full stop
                             // ... etc

2. Update to block-cursor.ts (Phase 4 - Dual Cursor)

Major changes:

a) Added CursorLayerType enum:

enum CursorLayerType {
  STANDARD = 'standard',
  ARABIC_WORD = 'arabic_word', 
  ARABIC_CHAR = 'arabic_char'
}

b) Extended Piece class:

  • Added layerType parameter (optional, defaults to STANDARD)
  • Updated eq() method to compare layerType

c) Modified readPos():

  • Changed to spread pieces array: cursors.push(...pieces)
  • Handles multiple pieces per cursor

d) Changed measureCursor() return type:

  • From: Piece | null
  • To: Piece[] | null
  • Returns array of pieces (enables multi-layer rendering)

e) Added measureArabicDualCursor() function (NEW):

  • Finds word boundaries using findArabicWordBoundaries()
  • Measures word block coordinates
  • Creates two Piece objects:
    1. Word-level block (semi-transparent pink background)
    2. Character-level outline (white 1px box-shadow)
  • Returns [wordPiece, charPiece]

f) Updated CSS theme:

  • Restored original focused cursor: background: "#ff9696"
  • Added .cm-cursor-arabic-word styles:
    • Semi-transparent background: rgba(255, 150, 150, 0.3)
    • z-index: 1
  • Added .cm-cursor-arabic-char styles:
    • White outline: boxShadow: "0 0 0 1px #ffffff"
    • Transparent background
    • z-index: 2
  • Unfocused state hides character outline

g) Decision logic in measureCursor():

if (scriptDetection.requiresSpecialCursor && isFocused) {
  return measureArabicDualCursor(...);
} else {
  return [new Piece(..., CursorLayerType.STANDARD)];
}

3. Import additions

  • src/block-cursor.ts imports findArabicWordBoundaries from ./word-boundary

TESTING RESULTS ✅

Tested with mixed Latin/Arabic text:

  • ✅ Latin "Hello world": White text visible in cursor (opaque)
  • ✅ Arabic letters: Transparent cursor + dual-cursor when focused
  • ✅ Arabic punctuation (comma): Standard cursor (not dual)
  • ✅ Spaces: Standard cursor (not dual)
  • ✅ Word boundaries: Correctly detected at script transitions
  • ✅ Navigation (h/j/k/l): Dual cursor tracks correctly through Arabic words
  • ✅ No skipped characters

NEXT STEPS (TODO)

1. Commit Phase 4

git add src/block-cursor.ts src/script-detection.ts
git commit -m "feat: Implement dual-cursor for Arabic/connected scripts

Implements Phase 4 of the dual-cursor system architecture.

This adds hierarchical dual-cursor rendering for Arabic text:
- Word-level block: Semi-transparent pink background covering entire connected word
- Character-level outline: White 1px outline on specific letter under cursor

Changes:
- Add CursorLayerType enum for different cursor rendering strategies
- Extend Piece class with layerType parameter
- Modify measureCursor() to return Piece[] for multi-layer rendering
- Add measureArabicDualCursor() function for dual-layer measurement
- Update CSS theme with Arabic-specific cursor styles
- Refine script detection to exclude only punctuation (not diacritics)
- Ensure spaces/whitespace always treated as word boundaries

Visual design:
- Focused Arabic: Semi-transparent pink word block + white char outline
- Focused Latin: Solid pink block with white text (opaque)
- Unfocused: Pink outline for both (character outline hidden for Arabic)

Performance: Word boundary detection O(n) where n ≤ 100 characters

Tested: ✅ Dual-cursor renders correctly on Arabic text
Tested: ✅ Word boundaries respect punctuation and spaces
Tested: ✅ Navigation (hjkl) tracks correctly through Arabic words

Related to replit/codemirror-vim#248"

2. Reapply workspace linking commit

# The tsconfig.json changes are already in place (uncommitted)
# Just need to commit them at the end
git add tsconfig.json
git commit -m "feat: Add workspace paths configuration for TypeScript

Configures TypeScript paths to resolve @codemirror/* from parent
node_modules, enabling proper workspace package resolution.

This allows building the vim plugin as a workspace package in the
parent Zettlr repository."

3. Final verification

  • Build: npm run build
  • Test in Zettlr with Arabic + Latin mixed text
  • Verify all cursor behaviors still work

4. Update parent repo

cd /Users/orwa/repos/Zettlr-official
git add packages/codemirror-vim
git commit -m "chore: Update vim plugin submodule to dual-cursor implementation"

FILES CHANGED SUMMARY

New files (created in earlier phases):

  • src/script-detection.ts ✅ COMMITTED
  • src/word-boundary.ts ✅ COMMITTED

Modified files (uncommitted):

  • src/block-cursor.ts - Phase 4 dual-cursor implementation
  • src/script-detection.ts - Punctuation refinements
  • tsconfig.json - Workspace paths (for local dev only)

Build artifacts:

  • dist/index.js - Built successfully (18:22)
  • dist/index.cjs - Built successfully

KNOWN ISSUES

None - all testing passed ✅

NOTES

  • tsconfig.json paths configuration is for LOCAL DEVELOPMENT ONLY
  • Do not commit tsconfig.json to upstream PR
  • Type declaration errors can be ignored (JS build succeeds)