feat: add macOS task board widget app

UTrello/App/BoardView.swift

@@ -0,0 +1,86 @@
+import SwiftUI
+
+struct BoardView: View {
+    @EnvironmentObject private var store: TaskStore
+    @State private var newTaskTitle = ""
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 20) {
+            Text("My board")
+                .font(.largeTitle.bold())
+
+            HStack(spacing: 12) {
+                TextField("Add a task", text: $newTaskTitle)
+                    .textFieldStyle(.roundedBorder)
+                    .onSubmit(addTask)
+                Button("Add", action: addTask)
+                    .keyboardShortcut(.defaultAction)
+            }
+
+            HStack(alignment: .top, spacing: 16) {
+                ForEach(TaskList.allCases) { list in
+                    TaskColumn(list: list, tasks: tasks(in: list))
+                }
+            }
+        }
+        .padding(24)
+        .frame(minWidth: 780, minHeight: 460)
+    }
+
+    private func tasks(in list: TaskList) -> [TaskItem] {
+        store.tasks.filter { $0.list == list }
+    }
+
+    private func addTask() {
+        store.add(title: newTaskTitle)
+        newTaskTitle = ""
+    }
+}
+
+private struct TaskColumn: View {
+    @EnvironmentObject private var store: TaskStore
+    let list: TaskList
+    let tasks: [TaskItem]
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 10) {
+            Text(list.title)
+                .font(.headline)
+            ScrollView {
+                LazyVStack(spacing: 8) {
+                    ForEach(tasks) { task in
+                        TaskCard(task: task)
+                    }
+                }
+            }
+        }
+        .padding(12)
+        .frame(maxWidth: .infinity, minHeight: 320, alignment: .topLeading)
+        .background(.quaternary, in: RoundedRectangle(cornerRadius: 12))
+    }
+}
+
+private struct TaskCard: View {
+    @EnvironmentObject private var store: TaskStore
+    let task: TaskItem
+
+    var body: some View {
+        HStack(alignment: .top, spacing: 8) {
+            Text(task.title)
+                .frame(maxWidth: .infinity, alignment: .leading)
+            Menu {
+                ForEach(TaskList.allCases.filter { $0 != task.list }) { list in
+                    Button("Move to \(list.title)") { store.move(task, to: list) }
+                }
+                Divider()
+                Button("Delete", role: .destructive) { store.delete(task) }
+            } label: {
+                Image(systemName: "ellipsis")
+            }
+            .menuStyle(.borderlessButton)
+            .fixedSize()
+        }
+        .padding(10)
+        .background(.background, in: RoundedRectangle(cornerRadius: 8))
+    }
+}

UTrello/App/UTrelloApp.swift

@@ -0,0 +1,14 @@
+import SwiftUI
+
+@main
+struct UTrelloApp: App {
+    @StateObject private var store = TaskStore()
+
+    var body: some Scene {
+        WindowGroup {
+            BoardView()
+                .environmentObject(store)
+        }
+        .windowResizability(.contentSize)
+    }
+}

UTrello/Shared/TaskItem.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+enum TaskList: String, CaseIterable, Codable, Identifiable {
+    case todo
+    case doing
+    case done
+
+    var id: String { rawValue }
+
+    var title: String {
+        switch self {
+        case .todo: "To do"
+        case .doing: "Doing"
+        case .done: "Done"
+        }
+    }
+}
+
+struct TaskItem: Identifiable, Codable, Equatable {
+    let id: UUID
+    var title: String
+    var list: TaskList
+    let createdAt: Date
+
+    init(id: UUID = UUID(), title: String, list: TaskList = .todo, createdAt: Date = .now) {
+        self.id = id
+        self.title = title
+        self.list = list
+        self.createdAt = createdAt
+    }
+}

UTrello/Shared/TaskStore.swift

@@ -0,0 +1,53 @@
+import Foundation
+import Combine
+#if canImport(WidgetKit)
+import WidgetKit
+#endif
+
+final class TaskStore: ObservableObject {
+    static let groupIdentifier = "group.com.example.utrello"
+    private static let tasksKey = "tasks"
+
+    @Published private(set) var tasks: [TaskItem] {
+        didSet { save() }
+    }
+
+    init() {
+        tasks = Self.loadTasks()
+    }
+
+    func add(title: String, to list: TaskList = .todo) {
+        let title = title.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !title.isEmpty else { return }
+        tasks.insert(TaskItem(title: title, list: list), at: 0)
+    }
+
+    func move(_ task: TaskItem, to list: TaskList) {
+        guard let index = tasks.firstIndex(of: task) else { return }
+        tasks[index].list = list
+    }
+
+    func delete(_ task: TaskItem) {
+        tasks.removeAll { $0.id == task.id }
+    }
+
+    private func save() {
+        guard let data = try? JSONEncoder().encode(tasks) else { return }
+        Self.defaults.set(data, forKey: Self.tasksKey)
+#if canImport(WidgetKit)
+        WidgetCenter.shared.reloadTimelines(ofKind: "UTrelloTasksWidget")
+#endif
+    }
+
+    static func loadTasks() -> [TaskItem] {
+        guard
+            let data = defaults.data(forKey: tasksKey),
+            let tasks = try? JSONDecoder().decode([TaskItem].self, from: data)
+        else { return [] }
+        return tasks
+    }
+
+    private static var defaults: UserDefaults {
+        UserDefaults(suiteName: groupIdentifier) ?? .standard
+    }
+}

UTrello/UTrello.entitlements

@@ -0,0 +1,12 @@
+<?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>com.apple.security.app-sandbox</key>
+    <true/>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>group.com.example.utrello</string>
+    </array>
+</dict>
+</plist>