todo
    h4 { opts.title }
    ul
        li(each='{ items.filter(filter) }')
            label(class='{ completed: done }')
                input(type='checkbox', checked='{ done }', onclick='{ parent.toggle }')
                |  { title }
    form(onsubmit='{ add }')
        input(name='input', onkeyup='{ edit }')
        button.todo(disabled='{ !text }') Add