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package transform
import (
htmltran "code.google.com/p/go-html-transform/html/transform"
"io"
"fmt"
)
type NavActive struct {
Section string
AttrName 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
}
if n.AttrName == "" {
n.AttrName = "hugo-nav"
}
tr.Apply(htmltran.ModifyAttrib("class", "active"), fmt.Sprintf("li[%s=%s]", n.AttrName, n.Section))
return tr.Render(w)
}
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