improve files listing for ghttp.Server

.example/other/config.toml

@@ -15,4 +15,11 @@
 
 [viewer]
     delimiters  =  ["${", "}"]
-    autoencode  =  true
+    autoencode  =  true
+
+
+[server]
+	Address     = ":8800"
+	ServerRoot  = "/Users/john/Downloads"
+	ServerAgent = "gf-app"
+#	LogPath     = "./log/gf-app/server"

.example/other/test2.go

@@ -1,12 +1,11 @@
 package main
 
 import (
-	"fmt"
+	"github.com/gogf/gf/frame/g"
 )
 
 func main() {
-	b1 := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0}
-	b2 := b1[:2]
-	b1[0] = 9
-	fmt.Println(b2)
+	s := g.Server()
+	s.SetIndexFolder(true)
+	s.Run()
 }

net/ghttp/ghttp_server_handler.go

@@ -279,7 +279,16 @@ func (s *Server) listDir(r *Request, f http.File) {
 		r.Response.WriteStatus(http.StatusInternalServerError, "Error reading directory")
 		return
 	}
-	sort.Slice(files, func(i, j int) bool { return files[i].Name() < files[j].Name() })
+	// The folder type has the most priority than file.
+	sort.Slice(files, func(i, j int) bool {
+		if files[i].IsDir() && !files[j].IsDir() {
+			return true
+		}
+		if !files[i].IsDir() && files[j].IsDir() {
+			return false
+		}
+		return files[i].Name() < files[j].Name()
+	})
 	if r.Response.Header().Get("Content-Type") == "" {
 		r.Response.Header().Set("Content-Type", "text/html; charset=utf-8")
 	}