Add a feature to serve templates from binary data generated by go-bindata

README.md

@@ -170,6 +170,34 @@ func main() {
 
 ~~~
 
+### Loading Templates from Binary Data Generated by [go-bindata](https://github.com/jteeuwen/go-bindata)
+
+You can load templates from binary data generated by [go-bindata](https://github.com/jteeuwen/go-bindata) by invoking the `RendererBin` function instead of the `Renderer` function:
+
+~~~go
+package main
+
+import (
+	"github.com/go-martini/martini"
+	"github.com/martini-contrib/render"
+)
+
+func main() {
+	m := martini.Classic()
+
+	// Load html templates from binary data.
+	m.Use(render.RendererBin(Asset, AssetNames()))
+
+	m.Get("/", func(r render.Render) {
+		r.HTML(200, "hello", "world")
+	})
+
+	m.Run()
+}
+~~~
+
+You have to pass the `Asset` function and the return value of the `AssetNames` function (these functions are generated by go-bindata) to the `RendererBin` function.
+
 ## Authors
 * [Jeremy Saenz](http://github.com/codegangsta)
 * [Cory Jacobsen](http://github.com/unrolled)

render.go

@@ -138,6 +138,18 @@ func Renderer(options ...Options) martini.Handler {
 	}
 }
 
+// RendererBin is same as Renderer but for loading templates from binary data (assets).
+func RendererBin(asset func(string) ([]byte, error), assetNames []string, options ...Options) martini.Handler {
+	opt := prepareOptions(options)
+	cs := prepareCharset(opt.Charset)
+	t := compileBin(asset, assetNames, opt)
+	return func(res http.ResponseWriter, req *http.Request, c martini.Context) {
+		// use a clone of the initial template
+		tc, _ := t.Clone()
+		c.MapTo(&renderer{res, req, tc, opt, cs}, (*Render)(nil))
+	}
+}
+
 func prepareCharset(charset string) string {
 	if len(charset) != 0 {
 		return "; charset=" + charset
@@ -209,6 +221,52 @@ func compile(options Options) *template.Template {
 	return t
 }
 
+// compileBin is same as compile but for loading templates from binary data (assets).
+func compileBin(asset func(string) ([]byte, error), assetNames []string, options Options) *template.Template {
+	dir := options.Directory
+	t := template.New(dir)
+	t.Delims(options.Delims.Left, options.Delims.Right)
+	// parse an initial template in case we don't have any
+	template.Must(t.Parse("Martini"))
+
+	for _, path := range assetNames {
+		if !strings.HasPrefix(path, dir) {
+			continue
+		}
+
+		r, err := filepath.Rel(dir, path)
+		if err != nil {
+			panic(err)
+		}
+
+		ext := getExt(r)
+
+		for _, extension := range options.Extensions {
+			if ext == extension {
+
+				buf, err := asset(path)
+				if err != nil {
+					panic(err)
+				}
+
+				name := (r[0 : len(r)-len(ext)])
+				tmpl := t.New(filepath.ToSlash(name))
+
+				// add our funcmaps
+				for _, funcs := range options.Funcs {
+					tmpl.Funcs(funcs)
+				}
+
+				// Bomb out if parse fails. We don't want any silent server starts.
+				template.Must(tmpl.Funcs(helperFuncs).Parse(string(buf)))
+				break
+			}
+		}
+	}
+
+	return t
+}
+
 func getExt(s string) string {
 	if strings.Index(s, ".") == -1 {
 		return ""

render_test.go

@@ -56,7 +56,7 @@ func Test_Render_JSON_Prefix(t *testing.T) {
 
 	expect(t, res.Code, 300)
 	expect(t, res.Header().Get(ContentType), ContentJSON+"; charset=UTF-8")
-	expect(t, res.Body.String(), prefix + `{"one":"hello","two":"world"}`)
+	expect(t, res.Body.String(), prefix+`{"one":"hello","two":"world"}`)
 }
 
 func Test_Render_Indented_JSON(t *testing.T) {
@@ -124,6 +124,29 @@ func Test_Render_HTML(t *testing.T) {
 	expect(t, res.Body.String(), "<h1>Hello jeremy</h1>\n")
 }
 
+func Test_Render_HTML_From_Binary_Data(t *testing.T) {
+	m := martini.Classic()
+	m.Use(RendererBin(
+		func(name string) ([]byte, error) {
+			return []byte("test"), nil
+		},
+		[]string{"templates/index.tmpl"},
+	))
+
+	// routing
+	m.Get("/foobar", func(r Render) {
+		r.HTML(200, "index", nil)
+	})
+
+	res := httptest.NewRecorder()
+	req, _ := http.NewRequest("GET", "/foobar", nil)
+
+	m.ServeHTTP(res, req)
+
+	expect(t, res.Code, 200)
+	expect(t, res.Header().Get(ContentType), ContentHTML+"; charset=UTF-8")
+	expect(t, res.Body.String(), "test")
+}
 func Test_Render_XHTML(t *testing.T) {
 	m := martini.Classic()
 	m.Use(Renderer(Options{