// Renders the example content including support for context sensitive
// text substitution.
func (c *exampleContent) Write(w io.Writer) (int, error) {
e := c.Example
wwwURL := fburl.URL{
Env: rellenv.FbEnv(c.Context),
}
w = htmlwriter.New(w)
tpl, err := template.New("example-" + e.URL).Parse(string(e.Content))
if err != nil {
// if template parsing fails, we ignore it. it's probably malformed html
return fmt.Fprint(w, e.Content)
}
countingW := counting.NewWriter(w)
err = tpl.Execute(countingW,
struct {
Rand string // a random token
RellFBNS string // the OG namespace
RellURL string // local http://www.fbrell.com/ URL
WwwURL string // server specific http://www.facebook.com/ URL
}{
Rand: randString(10),
RellFBNS: rellenv.FbApp(c.Context).Namespace(),
RellURL: c.Env.AbsoluteURL("/").String(),
WwwURL: wwwURL.String(),
})
if err != nil {
// if template execution fails, we ignore it. it's probably malformed html
return fmt.Fprint(w, e.Content)
}
return countingW.Count(), err
}
func TestWriter(t *testing.T) {
const payload = "hello world"
buf := bytes.NewBuffer(nil)
countingW := counting.NewWriter(buf)
fmt.Fprint(countingW, payload)
if countingW.Count() != len(payload) {
t.Fatalf("did not get expected count")
}
if buf.String() != payload {
t.Fatalf("did not get expected payload: %s", buf.String())
}
}