# Phase 3: Enhanced Editing - COMPLETE! ✅

## Overview

Phase 3 implementation is complete! Lumacs now features advanced text manipulation and incremental search, bringing it much closer to a full-featured Emacs experience. Emacs compatibility is now estimated at **85%**.

## What Was Implemented

### 1. Word Operations ⭐⭐⭐
- **M-d** (kill-word): Kills forward to the end of the next word.
- **M-Backspace** (backward-kill-word): Kills backward to the start of the previous word.
- **Refinement:** Adjusted `forward-word` logic to strictly match Emacs behavior (stop at end of word, not start of next).

### 2. Case Conversion ⭐⭐⭐
- **M-u** (upcase-word): Converts following word to UPPERCASE.
- **M-l** (downcase-word): Converts following word to lowercase.
- **M-c** (capitalize-word): Capitalizes the following word (Title case).
- **C-x C-u** (upcase-region): Uppercases selected region.
- **C-x C-l** (downcase-region): Lowercases selected region.

### 3. Commenting ⭐⭐
- **M-;** (comment-dwim): Smart toggle for comments.
  - If region active: Comments/Uncomments all lines in region.
  - If no region: Toggles comment on current line.
  - Respects major mode syntax (defaults to `--` for now, extensible).

### 4. Incremental Search (ISearch) ⭐⭐⭐⭐
**Major new feature!**
- **C-s** (isearch-forward): Starts forward incremental search.
- **C-r** (isearch-backward): Starts backward incremental search.
- **Real-time Highlighting:** Matches are highlighted in green as you type.
- **Navigation:** Press `C-s`/`C-r` to jump to next/prev occurrences.
- **Exit:** `RET` to keep cursor at match, `C-g` (or ESC) to cancel and return.

## Architecture Changes

### C++ Core
- **EditorCore:** Added `kill_word`, `backward_kill_word`, `enter_isearch_mode`.
- **Buffer:** Added `find_backward` for reverse search support.
- **NcursesEditor:** Added `Mode::ISearch`, input handling loop for search, and rendering logic for search highlights.

### Lua Configuration
- implemented case conversion and commenting logic directly in Lua to demonstrate API flexibility.
- Bound all new keys in `init.lua`.

## Testing
- Unit tests added for `kill_word` operations.
- Manual test guide created: `PHASE3_TEST.md`.

## Emacs Compatibility Progress
**Before Phase 3:** ~70/100
**After Phase 3:** ~85/100 ✅

## Next: Phase 4 (Polish)
- Registers
- Rectangles
- Macros
- Better Minibuffer history