Add subdirectory supports for HTML method

Author: thedevsaddam

README.md

@@ -1,7 +1,7 @@
 Package renderer
 ==================
 [![Build Status](https://travis-ci.org/thedevsaddam/renderer.svg?branch=master)](https://travis-ci.org/thedevsaddam/renderer)
-[![Project status](https://img.shields.io/badge/version-1.1-green.svg)](https://github.com/thedevsaddam/renderer/releases)
+[![Project status](https://img.shields.io/badge/version-1.2-green.svg)](https://github.com/thedevsaddam/renderer/releases)
 [![Go Report Card](https://goreportcard.com/badge/github.com/thedevsaddam/renderer)](https://goreportcard.com/report/github.com/thedevsaddam/renderer)
 [![Coverage Status](https://coveralls.io/repos/github/thedevsaddam/renderer/badge.svg?branch=master)](https://coveralls.io/github/thedevsaddam/renderer?branch=master)
 [![GoDoc](https://godoc.org/github.com/thedevsaddam/renderer?status.svg)](https://godoc.org/github.com/thedevsaddam/renderer)

renderer.go

@@ -17,7 +17,9 @@ import (
 	"html/template"
 	"io"
 	"io/ioutil"
+	"log"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
 
@@ -562,5 +564,23 @@ func (r *Render) parseGlob() {
 	for _, fm := range r.opts.FuncMap {
 		tmpl.Funcs(fm)
 	}
-	r.globTemplates = template.Must(tmpl.ParseGlob(r.opts.ParseGlobPattern))
+	if !strings.Contains(r.opts.ParseGlobPattern, "*.") {
+		log.Fatal("renderer: invalid glob pattern!")
+	}
+	pf := strings.Split(r.opts.ParseGlobPattern, "*")
+	fPath := pf[0]
+	fExt := pf[1]
+	err := filepath.Walk(fPath, func(path string, info os.FileInfo, err error) error {
+		if strings.Contains(path, fExt) {
+			_, err = tmpl.ParseFiles(path)
+			if err != nil {
+				log.Println(err)
+			}
+		}
+		return err
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	r.globTemplates = tmpl
 }