Add example to build single binary with templates (#1328)

examples/assets-in-binary/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"html/template"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	r := gin.New()
+	t, err := loadTemplate()
+	if err != nil {
+		panic(err)
+	}
+	r.SetHTMLTemplate(t)
+	r.GET("/", func(c *gin.Context) {
+		c.HTML(http.StatusOK, "/html/index.tmpl", gin.H{
+			"Foo": "World",
+		})
+	})
+	r.GET("/bar", func(c *gin.Context) {
+		c.HTML(http.StatusOK, "/html/bar.tmpl", gin.H{
+			"Bar": "World",
+		})
+	})
+	r.Run(":8080")
+}
+
+func loadTemplate() (*template.Template, error) {
+	t := template.New("")
+	for name, file := range Assets.Files {
+		if file.IsDir() || !strings.HasSuffix(name, ".tmpl") {
+			continue
+		}
+		h, err := ioutil.ReadAll(file)
+		if err != nil {
+			return nil, err
+		}
+		t, err = t.New(name).Parse(string(h))
+		if err != nil {
+			return nil, err
+		}
+	}
+	return t, nil
+}