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Add the ability to set navbar li class to active

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First cut at doing post html processing.  This utility can be used to
mark pages as active.
This commit is contained in:
Noah Campbell 2013-09-28 23:05:16 -07:00
parent db50154e75
commit f34ea6108d
2 changed files with 88 additions and 0 deletions
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28
transform/nav.go Normal file
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package transform
import (
htmltran "code.google.com/p/go-html-transform/html/transform"
"io"
"fmt"
)
type NavActive struct {
Section string
}
func (n *NavActive) Apply(r io.Reader, w io.Writer) (err error) {
var tr *htmltran.Transformer
if n.Section == "" {
_, err = io.Copy(w, r)
return
}
if tr, err = htmltran.NewFromReader(r); err != nil {
return
}
tr.Apply(htmltran.ModifyAttrib("class", "active"), fmt.Sprintf("li[data-nav=%s]", n.Section))
return tr.Render(w)
}

60
transform/nav_test.go Normal file
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package transform
import (
"bytes"
"strings"
"testing"
)
const HTML_WITH_NAV = `<!DOCTYPE html>
<html>
<head></head>
<body>
<nav>
<ul class="nav navbar-nav">
<li data-nav="section_1"><a href="#">Section 1</a></li>
<li data-nav="section_2"><a href="#">Section 2</a></li>
</ul>
</nav>
</body>
</html>
`
const EXPECTED_HTML_WITH_NAV_1 = `<!DOCTYPE html><html><head></head>
<body>
<nav>
<ul class="nav navbar-nav">
<li data-nav="section_1"><a href="#">Section 1</a></li>
<li data-nav="section_2" class="active"><a href="#">Section 2</a></li>
</ul>
</nav>
</body></html>`
func TestDegenerateNoSectionSet(t *testing.T) {
var (
tr = new(NavActive)
out = new(bytes.Buffer)
)
if err := tr.Apply(strings.NewReader(HTML_WITH_NAV), out); err != nil {
t.Errorf("Unexpected error in NavActive.Apply: %s", err)
}
if out.String() != HTML_WITH_NAV {
t.Errorf("NavActive.Apply should simply pass along the buffer unmodified.")
}
}
func TestSetNav(t *testing.T) {
tr := &NavActive{Section: "section_2"}
out := new(bytes.Buffer)
if err := tr.Apply(strings.NewReader(HTML_WITH_NAV), out); err != nil {
t.Errorf("Unexpected error in Apply() for NavActive: %s", err)
}
expected := EXPECTED_HTML_WITH_NAV_1
if out.String() != expected {
t.Errorf("NavActive.Apply output expected and got:\n%q\n%q", expected, out.String())
}
}