block header
  nav(role='navigation' class='menubar')
    span(class='left')
      ul
        li
          a(href='/')
            img(src='images/home.svg')
    span(class='right')
      ul
        if username
          li
            input(type='text', class='search')
          li
            a(href='/settings')
              img(src='images/settings.svg')
        else
          li
            a(href='/login')
              img(src='images/login.svg')