1{% code
 2type Selection int
 3const (
 4    Git Selection = iota
 5    List
 6    About
 7    Config
 8)
 9%}
10
11{% func insertIfEqual(s, d Selection) %}{% if s == d %} selected{% endif %}{% endfunc %}
12
13
14{% func Navbar (s Selection) %}
15        <nav class="container navbar navbar-expand">
16          <div class="navbar-nav">
17            <a class="nav-link{%= insertIfEqual(s, Git) %}" href="/">git</a>
18            <a class="nav-link{%= insertIfEqual(s, List) %}" href="/list">list</a>
19            <a class="nav-link{%= insertIfEqual(s, About) %}" href="/about">about</a>
20            <a class="nav-link{%= insertIfEqual(s, Config) %}" href="/config">config</a>
21          </div>
22        </nav>
23{% endfunc %}