Edit in JSFiddle

function todoCtrl(scope) {
  getDone  = function() { return scope.list.filter(e => {return e.done}) }
  getActif = function() { return scope.list.filter(e => {return !e.done}) }
  scope.$watch("list", function() {
    scope.done = getDone().length;
    scope.actif = getActif().length;
    scope.total = scope.list.length;
    scope.alldone = (scope.done == scope.total);
  }, {isArray: true, deep: true});
  scope.add = function() {
    if (!scope.title) return;
    scope.list.push({title: scope.title, done: false});
    scope.title = '';
  };
  scope.remove = function(item) { scope.list.splice(scope.list.indexOf(item), 1); }
  scope.removeDone = function() { getDone().forEach(e => {scope.remove(e)}); }
  scope.toggleAll = function() { scope.list.forEach(e => {e.done = scope.alldone;}); }
  scope.filter = {done: null};
  scope.list = [{title: "un", done: false}, {title: "deux", done: true}, {title: "trois", done: false}];
}

<script src="https://cdn.rawgit.com/lega911/alight/v0.12.30/alight.js"></script>
<section class="todoapp" al-app="todoCtrl">
  <header class="header">
    <h1>todos</h1>
    <input type="text" placeholder="What needs to be done?" class="new-todo" al-value="title" @keydown.enter="add()" autofocus>
  </header>
  <section class="main">
    <input class="toggle-all" type="checkbox" al-checked="alldone" al-change="toggleAll()" al-show="total">
    <ul class="todo-list">
      <li class="todo" al-repeat="item in list | filter:filter" al-css="completed:item.done, editing:item.editme">
        <div class="view">
          <input class="toggle" type="checkbox" al-checked="item.done" />
          <label @dblclick="item.editme=true">{{item.title}}</label>
        </div>
				<input class="edit" type="text" al-value="item.title" :focus="item.editme" @blur="item.editme=false" @keydown.enter="item.editme=false">
      </li>
    </ul>
  </section>
  <footer class="footer" al-show="total">
    <span class="todo-count">{{actif}} item<span al-show="actif > 1">s</span> left</span>
    <ul class="filters">
      <li><a href="#" al-css="selected:filter.done===null" @click="filter.done=null">All</a></li>
      <li><a href="#" al-css="selected:filter.done===false" @click="filter.done=false">Active</a></li>
      <li><a href="#" al-css="selected:filter.done===true" @click="filter.done=true">Completed</a></li>
    </ul>
    <button class="clear-completed" al-show="done" al-click="removeDone()">Clear completed</button>
  </footer>
</section>
<footer class="info">
	<p>Double-click to edit a todo</p>
	<p>Written by <a href="http://brahim.hamdouni.com">Brahim Hamdouni</a></p>
	<p>Not Part of <a href="http://todomvc.com">TodoMVC</a></p>
</footer>

html,
body {
  margin: 0;
  padding: 0;
}

button {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font-size: 100%;
  vertical-align: baseline;
  font-family: inherit;
  font-weight: inherit;
  color: inherit;
  -webkit-appearance: none;
  appearance: none;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  font-smoothing: antialiased;
}

body {
  font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.4em;
  background: #f5f5f5;
  color: #4d4d4d;
  min-width: 230px;
  max-width: 550px;
  margin: 0 auto;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  font-smoothing: antialiased;
  font-weight: 300;
}

button,
input[type="checkbox"] {
  outline: none;
}

.hidden {
  display: none;
}

.todoapp {
  background: #fff;
  margin: 130px 0 40px 0;
  position: relative;
  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp input::-webkit-input-placeholder {
  font-style: italic;
  font-weight: 300;
  color: #e6e6e6;
}

.todoapp input::-moz-placeholder {
  font-style: italic;
  font-weight: 300;
  color: #e6e6e6;
}

.todoapp input::input-placeholder {
  font-style: italic;
  font-weight: 300;
  color: #e6e6e6;
}

.todoapp h1 {
  position: absolute;
  top: -155px;
  width: 100%;
  font-size: 100px;
  font-weight: 100;
  text-align: center;
  color: rgba(175, 47, 47, 0.15);
  -webkit-text-rendering: optimizeLegibility;
  -moz-text-rendering: optimizeLegibility;
  text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
  position: relative;
  margin: 0;
  width: 100%;
  font-size: 24px;
  font-family: inherit;
  font-weight: inherit;
  line-height: 1.4em;
  border: 0;
  outline: none;
  color: inherit;
  padding: 6px;
  border: 1px solid #999;
  box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  font-smoothing: antialiased;
}

.new-todo {
  padding: 16px 16px 16px 60px;
  border: none;
  background: rgba(0, 0, 0, 0.003);
  box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
}

.main {
  position: relative;
  z-index: 2;
  border-top: 1px solid #e6e6e6;
}

label[for='toggle-all'] {
  display: none;
}

.toggle-all {
  position: absolute;
  top: -55px;
  left: -12px;
  width: 60px;
  height: 34px;
  text-align: center;
  border: none;
  /* Mobile Safari */
}

.toggle-all:before {
  content: '❯';
  font-size: 22px;
  color: #e6e6e6;
  padding: 10px 27px 10px 27px;
}

.toggle-all:checked:before {
  color: #737373;
}

.todo-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.todo-list li {
  position: relative;
  font-size: 24px;
  border-bottom: 1px solid #ededed;
}

.todo-list li:last-child {
  border-bottom: none;
}

.todo-list li.editing {
  border-bottom: none;
  padding: 0;
}

.todo-list li.editing .edit {
  display: block;
  width: 506px;
  padding: 13px 17px 12px 17px;
  margin: 0 0 0 43px;
}

.todo-list li.editing .view {
  display: none;
}

.todo-list li .toggle {
  text-align: center;
  width: 40px;
  /* auto, since non-WebKit browsers doesn't support input styling */
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  border: none;
  /* Mobile Safari */
  -webkit-appearance: none;
  appearance: none;
}

.todo-list li .toggle:after {
  content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#ededed" stroke-width="3"/></svg>');
}

.todo-list li .toggle:checked:after {
  content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#bddad5" stroke-width="3"/><path fill="#5dc2af" d="M72 25L42 71 27 56l-4 4 20 20 34-52z"/></svg>');
}

.todo-list li label {
  white-space: pre-line;
  word-break: break-all;
  padding: 15px 60px 15px 15px;
  margin-left: 45px;
  display: block;
  line-height: 1.2;
  transition: color 0.4s;
}

.todo-list li.completed label {
  color: #d9d9d9;
  text-decoration: line-through;
}

.todo-list li .destroy {
  display: none;
  position: absolute;
  top: 0;
  right: 10px;
  bottom: 0;
  width: 40px;
  height: 40px;
  margin: auto 0;
  font-size: 30px;
  color: #cc9a9a;
  margin-bottom: 11px;
  transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
  color: #af5b5e;
}

.todo-list li .destroy:after {
  content: '×';
}

.todo-list li:hover .destroy {
  display: block;
}

.todo-list li .edit {
  display: none;
}

.todo-list li.editing:last-child {
  margin-bottom: -1px;
}

.footer {
  color: #777;
  padding: 10px 15px;
  height: 20px;
  text-align: center;
  border-top: 1px solid #e6e6e6;
}

.footer:before {
  content: '';
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 50px;
  overflow: hidden;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 8px 0 -3px #f6f6f6, 0 9px 1px -3px rgba(0, 0, 0, 0.2), 0 16px 0 -6px #f6f6f6, 0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
  float: left;
  text-align: left;
}

.todo-count strong {
  font-weight: 300;
}

.filters {
  margin: 0;
  padding: 0;
  list-style: none;
  position: absolute;
  right: 0;
  left: 0;
}

.filters li {
  display: inline;
}

.filters li a {
  color: inherit;
  margin: 3px;
  padding: 3px 7px;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 3px;
}

.filters li a.selected,
.filters li a:hover {
  border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
  border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
  float: right;
  position: relative;
  line-height: 20px;
  text-decoration: none;
  cursor: pointer;
  position: relative;
}

.clear-completed:hover {
  text-decoration: underline;
}

.info {
  margin: 65px auto 0;
  color: #bfbfbf;
  font-size: 10px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  text-align: center;
}

.info p {
  line-height: 1;
}

.info a {
  color: inherit;
  text-decoration: none;
  font-weight: 400;
}

.info a:hover {
  text-decoration: underline;
}


/*
	Hack to remove background from Mobile Safari.
	Can't use it globally since it destroys checkboxes in Firefox
*/

@media screen and (-webkit-min-device-pixel-ratio:0) {
  .toggle-all,
  .todo-list li .toggle {
    background: none;
  }
  .todo-list li .toggle {
    height: 40px;
  }
  .toggle-all {
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
    -webkit-appearance: none;
    appearance: none;
  }
}

@media (max-width: 430px) {
  .footer {
    height: 50px;
  }
  .filters {
    bottom: 10px;
  }
}