From dfc76ddb764819509e38d2d4d2eee32601fcaea8 Mon Sep 17 00:00:00 2001
From: John <john@johng.cn>
Date: Thu, 5 Sep 2019 19:22:11 +0800
Subject: [PATCH] add IsEmpty function for gfile

---
 os/gfile/gfile.go        | 24 ++++++++++++++++++++++++
 os/gfile/gfile_z_test.go | 33 ++++++++++++++++++++++++++++-----
 2 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/os/gfile/gfile.go b/os/gfile/gfile.go
index 9063d9b4e..73a645e3b 100644
--- a/os/gfile/gfile.go
+++ b/os/gfile/gfile.go
@@ -404,6 +404,30 @@ func Dir(path string) string {
 	return filepath.Dir(path)
 }
 
+// IsEmpty checks whether the given <path> is empty.
+// If <path> is a folder, it checks if there's any file under it.
+// If <path> is a file, it checks if the file size is zero.
+func IsEmpty(path string) bool {
+	stat, err := Stat(path)
+	if err != nil {
+		return false
+	}
+	if stat.IsDir() {
+		file, err := os.Open(path)
+		if err != nil {
+			return false
+		}
+		defer file.Close()
+		names, err := file.Readdirnames(-1)
+		if err != nil {
+			return false
+		}
+		return len(names) == 0
+	} else {
+		return stat.Size() == 0
+	}
+}
+
 // Ext returns the file name extension used by path.
 // The extension is the suffix beginning at the final dot
 // in the final element of path; it is empty if there is
diff --git a/os/gfile/gfile_z_test.go b/os/gfile/gfile_z_test.go
index 36dac3c5e..d96691429 100644
--- a/os/gfile/gfile_z_test.go
+++ b/os/gfile/gfile_z_test.go
@@ -12,6 +12,9 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/gogf/gf/os/gtime"
+	"github.com/gogf/gf/util/gconv"
+
 	"github.com/gogf/gf/os/gfile"
 	"github.com/gogf/gf/test/gtest"
 )
@@ -29,6 +32,31 @@ func Test_IsDir(t *testing.T) {
 	})
 }
 
+func Test_IsEmpty(t *testing.T) {
+	gtest.Case(t, func() {
+		path := "/testdir_" + gconv.String(gtime.Nanosecond())
+		createDir(path)
+		defer delTestFiles(path)
+
+		gtest.Assert(gfile.IsEmpty(testpath()+path), true)
+		gtest.Assert(gfile.IsEmpty(testpath()+path+gfile.Separator+"test.txt"), false)
+	})
+	gtest.Case(t, func() {
+		path := "/testfile_" + gconv.String(gtime.Nanosecond())
+		createTestFile(path, "")
+		defer delTestFiles(path)
+
+		gtest.Assert(gfile.IsEmpty(testpath()+path), true)
+	})
+	gtest.Case(t, func() {
+		path := "/testfile_" + gconv.String(gtime.Nanosecond())
+		createTestFile(path, "1")
+		defer delTestFiles(path)
+
+		gtest.Assert(gfile.IsEmpty(testpath()+path), false)
+	})
+}
+
 func Test_Create(t *testing.T) {
 	gtest.Case(t, func() {
 		var (
@@ -36,20 +64,15 @@ func Test_Create(t *testing.T) {
 			filepaths []string
 			fileobj   *os.File
 		)
-
 		filepaths = append(filepaths, "/testfile_cc1.txt")
 		filepaths = append(filepaths, "/testfile_cc2.txt")
-
 		for _, v := range filepaths {
 			fileobj, err = gfile.Create(testpath() + v)
 			defer delTestFiles(v)
 			fileobj.Close()
 			gtest.Assert(err, nil)
-
 		}
-
 	})
-
 }
 
 func Test_Open(t *testing.T) {