Add parent example

paulsmith · paulsmith · commit 21c2f7477408 · 2021-08-22T12:44:19.000-05:00
diff --git a/src/text/template/exampleparent_test.go b/src/text/template/exampleparent_test.go
@@ -0,0 +1,78 @@
+package template_test
+
+import (
+	"log"
+	"os"
+	"text/template"
+)
+
+func ExampleTemplate_parent() {
+	const base_html = `<!DOCTYPE html>
+<html>
+	<head>
+		<title>{{block "title" .}}My website{{end}}</title>
+	</head>
+	<body>
+		<main>
+			{{- block "content" .}}{{end -}}
+		</main>
+		<footer>
+			{{- block "footer" .}}
+			<p>Thanks for visiting!</p>
+			{{- end}}
+		</footer>
+	</body>
+</html>
+
+`
+	base := template.Must(template.New("base.html").Parse(base_html))
+
+	const index_html = `{{define "content"}}<h1>Welcome!</h1>{{end}}`
+	index := template.Must(template.Must(base.Clone()).New("index.html").Parse(index_html))
+
+	{
+		err := index.ExecuteTemplate(os.Stdout, "base.html", nil)
+		if err != nil {
+			log.Println("executing template:", err)
+		}
+	}
+
+	const about_html = `{{define "title"}}{{template parent .}} - About{{end}}
+{{define "content"}}<h1>About us</h1>{{end}}`
+	about := template.Must(template.Must(base.Clone()).New("about.html").Parse(about_html))
+
+	{
+		err := about.ExecuteTemplate(os.Stdout, "base.html", nil)
+		if err != nil {
+			log.Println("executing template:", err)
+		}
+	}
+
+	// Output:
+	// <!DOCTYPE html>
+	// <html>
+	// 	<head>
+	// 		<title>My website</title>
+	// 	</head>
+	// 	<body>
+	// 		<main><h1>Welcome!</h1></main>
+	// 		<footer>
+	// 			<p>Thanks for visiting!</p>
+	// 		</footer>
+	// 	</body>
+	// </html>
+	//
+	// <!DOCTYPE html>
+	// <html>
+	// 	<head>
+	// 		<title>My website - About</title>
+	// 	</head>
+	// 	<body>
+	// 		<main><h1>About us</h1></main>
+	// 		<footer>
+	// 			<p>Thanks for visiting!</p>
+	// 		</footer>
+	// 	</body>
+	// </html>
+
+}
