From a56a93e19e32344faad48741e5af8d8d400080f0 Mon Sep 17 00:00:00 2001
From: Inhere <in.798@qq.com>
Date: Wed, 22 Mar 2023 22:00:08 +0800
Subject: [PATCH] :necktie: up(fs): add new fs util JoinSubPaths for join paths

---
 fsutil/fsutil.go              | 8 ++++++++
 fsutil/fsutil_nonwin_test.go  | 1 +
 fsutil/fsutil_windows_test.go | 1 +
 3 files changed, 10 insertions(+)

diff --git a/fsutil/fsutil.go b/fsutil/fsutil.go
index aa5c655d0..c4517ca18 100644
--- a/fsutil/fsutil.go
+++ b/fsutil/fsutil.go
@@ -87,6 +87,14 @@ func JoinPaths(elem ...string) string {
 	return filepath.Join(elem...)
 }
 
+// JoinSubPaths elements, like the filepath.Join()
+func JoinSubPaths(basePath string, elem ...string) string {
+	paths := make([]string, len(elem)+1)
+	paths[0] = basePath
+	copy(paths[1:], elem)
+	return filepath.Join(paths...)
+}
+
 // SlashPath alias of filepath.ToSlash
 func SlashPath(path string) string {
 	return filepath.ToSlash(path)
diff --git a/fsutil/fsutil_nonwin_test.go b/fsutil/fsutil_nonwin_test.go
index c50b40de7..2a9ac2c83 100644
--- a/fsutil/fsutil_nonwin_test.go
+++ b/fsutil/fsutil_nonwin_test.go
@@ -11,6 +11,7 @@ import (
 
 func TestSlashPath_nw(t *testing.T) {
 	assert.Eq(t, "path/to/dir", fsutil.JoinPaths("path", "to", "dir"))
+	assert.Eq(t, "path/to/dir", fsutil.JoinSubPaths("path", "to", "dir"))
 }
 
 func TestRealpath_nw(t *testing.T) {
diff --git a/fsutil/fsutil_windows_test.go b/fsutil/fsutil_windows_test.go
index 7a218cb50..665eb5ed5 100644
--- a/fsutil/fsutil_windows_test.go
+++ b/fsutil/fsutil_windows_test.go
@@ -11,6 +11,7 @@ import (
 
 func TestSlashPath_win(t *testing.T) {
 	assert.Eq(t, "path\\to\\dir", fsutil.JoinPaths("path", "to", "dir"))
+	assert.Eq(t, "path\\to\\dir", fsutil.JoinSubPaths("path", "to", "dir"))
 }
 
 func TestRealpath_win(t *testing.T) {