Use a Renderer interface instead of rendering fragments

image.go

@@ -0,0 +1,31 @@
+package gold
+
+import (
+	"io"
+
+	bf "gopkg.in/russross/blackfriday.v2"
+)
+
+type ImageElement struct {
+}
+
+func (e *ImageElement) Render(w io.Writer, node *bf.Node, tr *TermRenderer) error {
+	if len(node.LastChild.Literal) > 0 {
+		el := &BaseElement{
+			Token: string(node.LastChild.Literal),
+			Style: Image,
+		}
+		el.Render(w, node.LastChild, tr)
+	}
+	if len(node.LinkData.Destination) > 0 {
+		el := &BaseElement{
+			Token: resolveRelativeURL(tr.BaseURL, string(node.LinkData.Destination)),
+			Pre:   " [Image: ",
+			Post:  "]",
+			Style: Link,
+		}
+		el.Render(w, node, tr)
+	}
+
+	return nil
+}