textedit — A GPU-Accelerated Text Editor in Rust

A minimalist, high-performance text editor built with wgpu for GPU-accelerated rendering, winit for cross-platform windowing, and Clean Architecture principles.

Architecture

src/
├── main.rs              # Entry point
├── config.rs            # Editor configuration
├── error.rs             # EditorError enum (thiserror)
├── syntax.rs            # Syntax highlighting (syntect)
├── domain/              # Pure business logic (no external deps)
│   ├── buffer.rs        # Rope-backed text buffer
│   ├── cursor.rs        # Cursor & selection
│   ├── position.rs      # Line/column position
│   └── operations.rs    # Undo/redo history
├── ports/               # Trait definitions
│   ├── clipboard_port.rs
│   ├── file_port.rs
│   ├── render_port.rs
│   └── window_port.rs
├── application/         # Use cases
│   ├── editor_service.rs
│   └── file_service.rs
├── infrastructure/      # Adapter implementations
│   ├── clipboard.rs
│   └── file_system.rs
├── interface/           # Event handling (winit)
│   ├── app.rs
│   └── keyboard.rs
├── ui/                  # UI primitives, widgets, modals
│   ├── primitives.rs    # Point, Rect, Color, Primitive enum
│   ├── widget.rs        # Widget trait
│   ├── layers.rs        # Z-index layer management
│   ├── components.rs    # Status bar, line numbers
│   ├── layout.rs        # UI layout
│   ├── event_router.rs  # Mouse/keyboard routing
│   ├── widgets/         # Button, Input, Label
│   └── modal/           # FindModal, InputField
├── renderer/            # GPU rendering (wgpu, fontdue)
│   ├── layout.rs        # EditorLayout, Colors
│   ├── glyph_cache.rs   # Font atlas
│   ├── text.rs          # Text layout
│   ├── text_geometry.rs # Text quads
│   ├── cursor.rs        # Cursor geometry
│   ├── scrollbar.rs     # Scrollbar geometry
│   ├── line_numbers.rs  # Line number geometry
│   ├── status_bar.rs    # Status bar geometry
│   ├── ui_background.rs # Background geometry
│   ├── primitive_builders.rs
│   ├── primitive_renderer.rs  # Primitive-to-GPU conversion
│   └── modal/           # Modal geometry builders
├── state/               # GPU state management
│   ├── init.rs          # State struct, wgpu init
│   ├── font.rs          # System font loading
│   ├── render.rs        # Render pass
│   ├── scroll.rs        # Scrolling state
│   └── geometry/        # Buffer updates
├── menu/                # Native menu bar (muda)
│   ├── actions.rs       # MenuAction enum
│   ├── handler.rs       # Menu building
│   ├── helpers.rs       # Menu item helpers
│   └── platform.rs      # Platform menu setup
└── themes/              # Editor themes
    ├── mod.rs           # EditorTheme enum
    ├── dark.rs          # Dark theme
    └── light.rs         # Light theme

Features

Editing

• Insert, delete, backspace with full Unicode support
• Tab (4-space indentation), Enter for newlines
• Arrow key navigation, Home/End
• Selection management (Shift+Arrow)
• Undo/Redo (Ctrl+Z / Ctrl+Y)
• Cut/Copy/Paste (Ctrl+X / Ctrl+C / Ctrl+V)

File Operations

• Open/Save via native file dialogs
• UTF-8 encoding
• Multi-file support (new/close without quitting)
• File modification detection

Find & Replace

• Find (Ctrl+F) with match highlighting
• Find Next/Previous (Enter/Shift+Enter, Ctrl+G/Ctrl+Shift+G)
• Replace (Ctrl+H): replace one or all matches
• Match count display

Syntax Highlighting

• Language detection via file extension
• Multiple themes (syntect)
• GPU-optimized highlight caching

UI

• Dark & Light editor themes
• Toggle line numbers / status bar
• Native menu bar (macOS/Windows/Linux)
• GPU-accelerated rendering via wgpu
• Resizable window

Quick Start

# Build & run (debug)
cargo run

# Build & run (release)
cargo run --release

# Run tests
cargo test

# Check & lint
cargo check
cargo clippy
cargo fmt

Keyboard Shortcuts

Shortcut	Action
Ctrl+Z	Undo
Ctrl+Y / Ctrl+Shift+Z	Redo
Ctrl+X	Cut
Ctrl+C	Copy
Ctrl+V	Paste
Ctrl+S	Save
Ctrl+O	Open
Ctrl+N	New
Ctrl+W	Close
Ctrl+F	Find
Ctrl+G	Find Next
Ctrl+Shift+G	Find Previous
Ctrl+H	Replace
Ctrl+A	Select All
Delete	Delete
Home	Line start
End	Line end
← → ↑ ↓	Move cursor
Shift+Arrow	Extend selection

Stack

• wgpu 0.20 — GPU rendering (Vulkan, Metal, DX12, WebGPU)
• winit 0.30 — Windowing & input
• ropey 1.6 — Rope data structure for text buffer
• fontdue 0.7 — Font rasterization
• syntect — Syntax highlighting
• muda — Native menu bar
• arboard — Clipboard
• rfd — Native file dialogs