add prefix for render templates

render/options.go

@@ -32,4 +32,7 @@ type Options struct {
 	// DefaultContentType instructs the engine what it should fall back to if
 	// the "content-type" is unknown
 	DefaultContentType string
+
+	// Prefix inherits the global single prefix from buffalo.Options
+	Prefix string
 }

render/template.go

@@ -266,18 +266,18 @@ func (s *templateRenderer) assetPath(file string) (string, error) {
 		if err != nil {
 			manifest, err = s.AssetsFS.Open("assets/manifest.json")
 			if err != nil {
-				return assetPathFor(file), nil
+				return assetPathFor(s.Prefix, file), nil
 			}
 		}
 		defer manifest.Close()
 
 		err = loadManifest(manifest)
 		if err != nil {
-			return assetPathFor(file), fmt.Errorf("your manifest.json is not correct: %s", err)
+			return assetPathFor(s.Prefix, file), fmt.Errorf("your manifest.json is not correct: %s", err)
 		}
 	}
 
-	return assetPathFor(file), nil
+	return assetPathFor(s.Prefix, file), nil
 }
 
 // Template renders the named files using the specified

render/template_helpers.go

@@ -45,12 +45,12 @@ func (s *templateRenderer) addAssetsHelpers(helpers Helpers) Helpers {
 
 var assetMap = stringMap{}
 
-func assetPathFor(file string) string {
+func assetPathFor(prefix string, file string) string {
 	filePath, ok := assetMap.Load(file)
 	if filePath == "" || !ok {
 		filePath = file
 	}
-	return path.Join("/assets", filePath)
+	return path.Join(prefix, "assets", filePath)
 }
 
 func loadManifest(manifest io.Reader) error {