Add native macOS SwiftUI GUI

macos-gui/.gitignore

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+# Swift build artifacts
+.build/
+*.o
+*.d
+
+# Generated app bundle
+Untrunc.app/
+
+# DMG installer
+*.dmg
+
+# Pre-built CLI binary (compiled locally, not committed)
+Sources/UntruncGUI/untrunc
+
+# macOS
+.DS_Store

macos-gui/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleExecutable</key>
+    <string>UntruncGUI</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.local.UntruncGUI</string>
+    <key>CFBundleName</key>
+    <string>Untrunc</string>
+    <key>CFBundleDisplayName</key>
+    <string>Untrunc</string>
+    <key>CFBundleVersion</key>
+    <string>1.0</string>
+    <key>CFBundleShortVersionString</key>
+    <string>1.0</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleSignature</key>
+    <string>????</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>13.0</string>
+    <key>NSHighResolutionCapable</key>
+    <true/>
+    <key>CFBundleIconFile</key>
+    <string>AppIcon</string>
+    <key>NSPrincipalClass</key>
+    <string>NSApplication</string>
+    <key>CFBundleDocumentTypes</key>
+    <array>
+        <dict>
+            <key>CFBundleTypeName</key>
+            <string>Video File</string>
+            <key>CFBundleTypeExtensions</key>
+            <array>
+                <string>mp4</string>
+                <string>m4v</string>
+                <string>mov</string>
+                <string>3gp</string>
+            </array>
+            <key>CFBundleTypeRole</key>
+            <string>Viewer</string>
+        </dict>
+    </array>
+    <key>NSAppleEventsUsageDescription</key>
+    <string>Untrunc needs access to repair video files.</string>
+</dict>
+</plist>

macos-gui/Package.swift

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+// swift-tools-version: 5.9
+import PackageDescription
+
+let package = Package(
+    name: "UntruncGUI",
+    platforms: [.macOS(.v13)],
+    targets: [
+        .executableTarget(
+            name: "UntruncGUI",
+            path: "Sources/UntruncGUI",
+            resources: [
+                .copy("untrunc"),
+                .copy("AppIcon.icns")
+            ]
+        )
+    ]
+)

macos-gui/README.md

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+# Untrunc — macOS GUI
+
+A native macOS SwiftUI application for **untrunc** — drag-and-drop video repair without touching the terminal.
+
+![macOS 13+](https://img.shields.io/badge/macOS-13%2B-blue) ![Swift 5.9](https://img.shields.io/badge/Swift-5.9-orange) ![Architecture](https://img.shields.io/badge/arch-arm64-lightgrey)
+
+## Features
+
+- **Drag & drop** reference file and corrupt file
+- All key CLI flags exposed as checkboxes (`-s`, `-sv`, `-k`, `-dw`, `-ms`)
+- Live log output streamed in real time
+- "Show in Finder" button when repair completes
+- Fully self-contained DMG — no Homebrew or FFmpeg needed on the target machine
+
+## Requirements (to build)
+
+- macOS 13 Ventura or later (Apple Silicon)
+- Xcode Command Line Tools: `xcode-select --install`
+- FFmpeg via Homebrew: `brew install ffmpeg`
+
+## Build & Run
+
+```bash
+cd macos-gui
+bash build.sh
+open Untrunc.app
+```
+
+## Create a distributable DMG
+
+```bash
+# Also requires: brew install create-dmg
+bash package_dmg.sh
+# → produces Untrunc-1.0.dmg
+```
+
+The DMG bundles all FFmpeg dylibs inside the `.app` and rewrites their
+install names to `@loader_path`-relative paths, so the app runs on any
+macOS 13+ Apple Silicon machine with no dependencies.
+
+## Project structure
+
+```
+macos-gui/
+├── Sources/UntruncGUI/
+│   ├── UntruncApp.swift      # @main SwiftUI entry point
+│   ├── ContentView.swift     # Full UI (drop zones, options, log panel)
+│   ├── UntruncRunner.swift   # Runs untrunc CLI as subprocess, streams output
+│   └── AppIcon.icns          # App icon (regenerate with make_icon.py)
+├── Package.swift             # Swift Package manifest
+├── Info.plist                # macOS app bundle metadata
+├── build.sh                  # Compiles untrunc + Swift app → Untrunc.app
+├── bundle_libs.sh            # Bundles FFmpeg dylibs and rewrites @rpath
+├── package_dmg.sh            # Full pipeline → Untrunc-1.0.dmg
+├── make_icon.py              # Generates AppIcon.icns using AppKit
+└── make_dmg_bg.py            # Generates DMG background image using AppKit
+```