loadTemplate: support loading mulitple templates

frontend/frontend.go

@@ -1,6 +1,7 @@
 package frontend
 
 import (
+	"fmt"
 	"io/ioutil"
 	"net/http"
 
@@ -16,23 +17,34 @@ import (
 
 //TODO: log last update
 
-//loadTemplate loads a single template from statikFS and returns a template object
+//loadTemplate loads a list of templates, relative to the statikFS root, and a FuncMap, and returns a template object
-func loadTemplate(templateName string, funcMap template.FuncMap) (*template.Template, error) {
+func loadTemplate(templateNames []string, funcMap template.FuncMap) (*template.Template, error) {
-	tmpl := template.New(templateName).Funcs(funcMap)
+	if len(templateNames) == 0 {
+		return nil, fmt.Errorf("templateNames can't be empty")
+	}
+	tmpl := template.New(templateNames[0]).Funcs(funcMap)
 	statikFS, err := fs.New()
 	if err != nil {
 		return nil, err
 	}
-	r, err := statikFS.Open("/" + templateName)
+
-	if err != nil {
+	for _, templateName := range templateNames {
-		return nil, err
+		r, err := statikFS.Open("/" + templateName)
+		if err != nil {
+			return nil, err
+		}
+		defer r.Close()
+		contents, err := ioutil.ReadAll(r)
+		if err != nil {
+			return nil, err
+		}
+		tmpl, err = tmpl.Parse(string(contents))
+		if err != nil {
+			return nil, err
+		}
 	}
-	defer r.Close()
+
-	contents, err := ioutil.ReadAll(r)
+	return tmpl, nil
-	if err != nil {
-		return nil, err
-	}
-	return tmpl.Parse(string(contents))
 }
 
 // MakeFrontend configures the router and returns a new Frontend struct