Add new method LoadHTMLFilesRecursively for recursively load template files in a folder

README.md

@@ -829,13 +829,17 @@ func main() {
 
 ### HTML rendering
 
-Using LoadHTMLGlob() or LoadHTMLFiles()
+Using LoadHTMLGlob(), LoadHTMLFiles() or LoadHTMLFilesRecursively
 
 ```go
 func main() {
 	router := gin.Default()
 	router.LoadHTMLGlob("templates/*")
 	//router.LoadHTMLFiles("templates/template1.html", "templates/template2.html")
+
+	// load recursively all .html in "public" folder
+	//router.LoadHTMLFilesRecursively("public", []string{".html"})
+	
 	router.GET("/index", func(c *gin.Context) {
 		c.HTML(http.StatusOK, "index.tmpl", gin.H{
 			"title": "Main website",

gin.go

@@ -10,6 +10,9 @@ import (
 	"net/http"
 	"os"
 	"sync"
+	"strings"
+	"sort"
+	"path/filepath"
 
 	"github.com/gin-gonic/gin/render"
 )
@@ -194,6 +197,26 @@ func (engine *Engine) LoadHTMLFiles(files ...string) {
 	engine.SetHTMLTemplate(templ)
 }
 
+// LoadHTMLFilesRecursively loads recursivly a slice of HTML files mathing an extension
+// and associates the result with HTML renderer.
+func (engine *Engine) LoadHTMLFilesRecursively(folder string, extensionsAllowed []string) {
+
+	files := []string{}
+	sort.Strings(extensionsAllowed)
+
+	filepath.Walk(folder, func(path string, info os.FileInfo, err error) error {
+		extension := strings.ToLower(filepath.Ext(path))
+		indexFound := sort.SearchStrings(extensionsAllowed, extension)
+		if indexFound < len(extensionsAllowed) && extensionsAllowed[indexFound] == extension {
+			files = append(files, path);
+		}
+
+		return nil
+	})
+
+	engine.LoadHTMLFiles(files...)
+}
+
 // SetHTMLTemplate associate a template with HTML renderer.
 func (engine *Engine) SetHTMLTemplate(templ *template.Template) {
 	if len(engine.trees) > 0 {