markdown: support soft-line breaks (#92)

markdown/extender.go

@@ -174,6 +174,11 @@ func (r *nodeRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
 
 		n := node.(*ast.Text)
 		text := n.Text(source)
+		if len(text) == 0 {
+			// Simply write a line break if there is no text in the node, otherwise, soft break lines are sticking.
+			_ = w.WriteByte('\n')
+			return ast.WalkContinue, nil
+		}
 
 		// Rewrites `{#foo}` directives in text to `<a id="foo"></a>` anchors.
 		matches := anchorDirectivePattern.FindAllIndex(text, -1)

markdown/markdown.go

@@ -71,7 +71,6 @@ func New(opts Options) goldmark.Markdown {
 			parser.WithAttribute(),
 		),
 		goldmark.WithRendererOptions(
-			goldmarkhtml.WithHardWraps(),
 			goldmarkhtml.WithXHTML(),
 			goldmarkhtml.WithUnsafe(),
 		),

markdown/markdown_test.go

@@ -134,7 +134,9 @@ func TestRenderer(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			want := `<h1 id="b"><a name="b" class="anchor" href="#b" rel="nofollow" aria-hidden="true" title="#b"></a>a</h1>` + "\n"
+			want := `<h1 id="b"><a name="b" class="anchor" href="#b" rel="nofollow" aria-hidden="true" title="#b"></a>a
+</h1>
+`
 			if string(doc.HTML) != want {
 				t.Errorf("got %q, want %q", string(doc.HTML), want)
 			}