New Render API

render/text.go

@@ -5,21 +5,20 @@ import (
 	"net/http"
 )
 
-type plainTextRender struct{}
+type String struct {
+	Format string
+	Data   []interface{}
+}
 
-func (_ plainTextRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
-	format := data[0].(string)
-	values := data[1].([]interface{})
-	WritePlainText(w, code, format, values)
+func (r String) Write(w http.ResponseWriter) error {
+	header := w.Header()
+	if _, exist := header["Content-Type"]; !exist {
+		header.Set("Content-Type", "text/plain; charset=utf-8")
+	}
+	if len(r.Data) > 0 {
+		fmt.Fprintf(w, r.Format, r.Data...)
+	} else {
+		w.Write([]byte(r.Format))
+	}
 	return nil
 }
-
-func WritePlainText(w http.ResponseWriter, code int, format string, values []interface{}) {
-	writeHeader(w, code, "text/plain; charset=utf-8")
-	// we assume w.Write can not fail, is that right?
-	if len(values) > 0 {
-		fmt.Fprintf(w, format, values...)
-	} else {
-		w.Write([]byte(format))
-	}
-}