Use a Renderer interface instead of rendering fragments

listitem.go

@@ -0,0 +1,29 @@
+package gold
+
+import (
+	"io"
+	"strings"
+
+	bf "gopkg.in/russross/blackfriday.v2"
+)
+
+type ItemElement struct {
+}
+
+func (e *ItemElement) Render(w io.Writer, node *bf.Node, tr *TermRenderer) error {
+	l := 0
+	n := node
+	for n.Parent != nil && (n.Parent.Type == bf.List || n.Parent.Type == bf.Item) {
+		if n.Parent.Type == bf.List {
+			l++
+		}
+		n = n.Parent
+	}
+
+	el := &BaseElement{
+		Pre:   strings.Repeat("  ", l-1) + "• ",
+		Token: string(node.Literal),
+		Style: Item,
+	}
+	return el.Render(w, node, tr)
+}