feat: tags todomvc demo based on older one

examples/tags-todomvc/.gitignore

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+node_modules
+build
+*.log

examples/tags-todomvc/package.json

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+{
+  "name": "tags-todomvc",
+  "description": "Marko TodoMVC example",
+  "version": "1.0.0",
+  "dependencies": {
+    "@marko/tags-api-preview": "^0",
+    "marko": "^5"
+  },
+  "devDependencies": {
+    "@marko/build": "^4",
+    "@marko/serve": "^4"
+  },
+  "private": true,
+  "scripts": {
+    "build": "marko-build ./src/pages",
+    "dev": "marko-serve ./src/pages",
+    "start": "node ./build/index.js"
+  }
+}

examples/tags-todomvc/src/components/todomvc-app/demo.marko

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+<const/todos = [
+    {
+      title: "Learn marko",
+      completed: true,
+      id: 0
+    },
+    {
+      title: "Build an awesome web app",
+      completed: false,
+      id: 1
+    },
+    {
+      title: "Profit",
+      completed: false,
+      id: 2
+    }
+  ]
+/>
+
+<todomvc-app todos=todos filter="all"/>

examples/tags-todomvc/src/components/todomvc-app/index.marko

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+<todomvc-store/{
+  todos,
+  filter,
+  setFilter,
+  addNewTodo,
+  clearCompleted,
+  toggleAllTodosCompleted,
+  updateTodo,
+  removeTodo
+ }/>
+<section.todoapp>
+  <todomvc-header addNewTodo=addNewTodo />
+  <if=todos.length>
+    <const/filteredTodos = todos.filter(todo => {
+      if (todo.pending) return true;
+      if (filter === "active") return !todo.completed;
+      if (filter === "completed") return todo.completed;
+      return true;
+    })/>
+    <const/remainingCount=todos.length - todos.filter((todo) => todo.completed).length />
+    <const/handleFilter=((filter) => (e) => {
+      setFilter(filter);
+      e.preventDefault();
+    })/>
+    <section.main>
+      <id/toggleId />
+      <input.toggle-all
+        id=toggleId
+        type="checkbox"
+        checked=(!remainingCount)
+        onChange(e) {
+          toggleAllTodosCompleted(e.target.checked);
+        }>
+      <label for=toggleId />
+      <ul.todo-list>
+        <for|todo| of=filteredTodos by=(todo => todo.id)>
+          <todomvc-todo-item
+            todo=todo
+            updateTodo=updateTodo
+            removeTodo=removeTodo />
+        </for>
+      </ul>
+    </section>
+    <footer.footer>
+      <span.todo-count>
+        <strong>${remainingCount}</strong> ${remainingCount > 1 ? "items" : "item"} left
+      </span>
+      <ul.filters>
+        <li>
+          <a
+            href="#/"
+            class={ selected: filter === "all" }
+            onClick=handleFilter("all")>
+            All
+          </a>
+        </li>
+        <li>
+          <a
+            href="#/active"
+            class={ selected: filter === "active" }
+            onClick=handleFilter("active")>
+            Active
+          </a>
+        </li>
+        <li>
+          <a
+            href="#/completed"
+            class={ selected: filter === "completed" }
+            onClick=handleFilter("completed")>
+            Completed
+          </a>
+        </li>
+      </ul>
+      <if=(remainingCount !== todos.length)>
+        <button.clear-completed onClick=clearCompleted >
+          Clear completed
+        </button>
+      </if>
+    </footer>
+  </if>
+</section>
+
+<style>
+  @import url("https://unpkg.com/[email protected]/index.css");
+</style>

examples/tags-todomvc/src/components/todomvc-header/demo.marko

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+<div.todoapp>
+  <todomvc-header/>
+</div>
+<style>
+  @import url("https://unpkg.com/[email protected]/index.css");
+</style>

examples/tags-todomvc/src/components/todomvc-header/index.marko

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+<attrs/{ addNewTodo } />
+<header.header>
+  <h1>todos</h1>
+  <form onSubmit(e) {
+    const titleInput = title();
+    addNewTodo({ title: titleInput.value });
+    titleInput.value = "";
+    e.preventDefault();
+  }>
+    <input/title class="new-todo" placeholder="What needs to be done?"/>
+  </form>
+</header>
+
+<style>
+  .header form {
+    margin: 0;
+  }
+</style>

examples/tags-todomvc/src/components/todomvc-store/index.marko

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+<let/nextId=3/>
+<let/todos=[{
+    title: 'Learn marko',
+    completed: true,
+    id: 0
+  },
+  {
+    title: 'Build an awesome web app',
+    completed: false,
+    id: 1
+  },
+  {
+    title: 'Profit',
+    completed: false,
+    id: 2
+  }]/>
+<let/filter="all"/>
+<return={
+  todos,
+  filter,
+  setFilter(f) { filter = f },
+  updateTodo(todoId, newProps) {
+    todos = todos.map(todo => {
+      if (todo.id !== todoId) return todo;
+      return { ...todo, ...newProps }
+    })
+  },
+  clearCompleted() {
+    todos = todos.filter(todo => !todo.completed);
+  },
+  removeTodo(todoId) {
+    todos = todos.filter(todo => todo.id !== todoId);
+  },
+  toggleAllTodosCompleted(completed) {
+    todos = todos.map((todo) => {
+      if (todo.completed === completed) return todo;
+      return { ...todo, completed };
+    });
+  },
+  addNewTodo(todoData) {
+    todos = [...todos, {
+      title: todoData.title,
+      id: 'c' + (nextId++),
+      completed: false
+    }];
+  }
+} />

examples/tags-todomvc/src/components/todomvc-todo-item/animations.js

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+export function animateOut(event, node) {
+  event.preventDefault();
+  node.classList.add("animate");
+  var height = node.offsetHeight;
+  node.style.maxHeight = height + "px";
+
+  setTimeout(() => {
+    node.style.maxHeight = "0px";
+    node.style.opacity = 0;
+
+    setTimeout(() => {
+      event.detach();
+    }, 250);
+  }, 0);
+}
+
+export function animateIn(event, node) {
+  var height = node.offsetHeight;
+  node.classList.remove("animate");
+  node.style.maxHeight = "0px";
+  node.style.opacity = 0;
+
+  setTimeout(() => {
+    node.classList.add("animate");
+    node.style.maxHeight = height + "px";
+    node.style.opacity = 1;
+  }, 10);
+}

examples/tags-todomvc/src/components/todomvc-todo-item/demo.marko

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+<section.main>
+  <ul.todo-list>
+    <todomvc-todo-item title="Learn Marko" completed=false id="fake1"/>
+    <todomvc-todo-item title="Learn Marko" completed=true id="fake2"/>
+  </ul>
+</section>
+<style>
+  @import url("https://unpkg.com/[email protected]/index.css");
+</style>

examples/tags-todomvc/src/components/todomvc-todo-item/index.marko

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+import { animateIn, animateOut } from "./animations";
+
+<attrs/{ todo, updateTodo, removeTodo } />
+<let/isEditing=false />
+<let/editingTitle="" />
+<const/saveEdit() {
+  if (isEditing) {
+    const el = title();
+    updateTodo(todo.id, { title: el.value });
+    isEditing = false;
+  }
+}/>
+<const/handleInputKeyDown(e) {
+  if (e.keyCode === 13 /* ENTER */) {
+    saveEdit();
+  } else if (e.keyCode === 27 /* ESC */) {
+    isEditing = false;
+  }
+}/>
+
+<li
+  class={ completed: todo.completed, editing: isEditing }
+  onDetach=animateOut
+  onAttach=animateIn>
+  <div.view>
+    <input.toggle
+      type="checkbox"
+      checked=todo.completed
+      aria-label="Toggle todo completed"
+      onChange(e) {
+        var completed = e.target.checked === true;
+        updateTodo(todo.id, {completed});
+      }/>
+    <label onDblClick() {
+      isEditing = true;
+      editingTitle = todo.title;
+    }>
+      ${todo.title}
+    </label>
+
+    <button.destroy
+      onClick() { removeTodo(todo.id) }
+      aria-label="Delete todo"
+    />
+  </div>
+
+  <input/title
+    class="edit"
+    title="Enter the new todo title"
+    type="text"
+    value=editingTitle
+    onBlur=saveEdit
+    onChange=saveEdit
+    onKeydown=handleInputKeyDown/>
+</li>

examples/tags-todomvc/src/components/todomvc-todo-item/style.css

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+.todo-list li.pending .toggle, .todo-list li.pending button {
+  visibility: hidden;
+}
+
+.todo-list li.pending label {
+  color: #d9d9d9;
+}
+
+.todo-list li {
+  opacity: 1;
+  background-color: #fff;
+  overflow: hidden;
+}
+
+.todo-list li.animate {
+  transition: opacity 250ms ease-in-out, max-height 250ms ease-in-out;
+}

examples/tags-todomvc/src/pages/index.marko

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+<html>
+  <head>
+    <title>Marko | TodoMVC</title>
+  </head>
+  <body>
+    <todomvc-app/>
+  </body>
+</html>