From dd84b9d64fb98746a230cd24233ff50a562c39c9 Mon Sep 17 00:00:00 2001
From: 简律纯 <hsiangnianian@outlook.com>
Date: Fri, 28 Apr 2023 01:36:44 +0800
Subject:

---
 cli/internal/fs/lstat.go | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 cli/internal/fs/lstat.go

(limited to 'cli/internal/fs/lstat.go')

diff --git a/cli/internal/fs/lstat.go b/cli/internal/fs/lstat.go
new file mode 100644
index 0000000..eff0810
--- /dev/null
+++ b/cli/internal/fs/lstat.go
@@ -0,0 +1,74 @@
+package fs
+
+import (
+	"io/fs"
+	"os"
+
+	"github.com/vercel/turbo/cli/internal/turbopath"
+)
+
+// LstatCachedFile maintains a cache of file info, mode and type for the given Path
+type LstatCachedFile struct {
+	Path     turbopath.AbsoluteSystemPath
+	fileInfo fs.FileInfo
+	fileMode *fs.FileMode
+	fileType *fs.FileMode
+}
+
+// GetInfo returns, and caches the file info for the LstatCachedFile.Path
+func (file *LstatCachedFile) GetInfo() (fs.FileInfo, error) {
+	if file.fileInfo != nil {
+		return file.fileInfo, nil
+	}
+
+	err := file.lstat()
+	if err != nil {
+		return nil, err
+	}
+
+	return file.fileInfo, nil
+}
+
+// GetMode returns, and caches the file mode for the LstatCachedFile.Path
+func (file *LstatCachedFile) GetMode() (fs.FileMode, error) {
+	if file.fileMode != nil {
+		return *file.fileMode, nil
+	}
+
+	err := file.lstat()
+	if err != nil {
+		return 0, err
+	}
+
+	return *file.fileMode, nil
+}
+
+// GetType returns, and caches the type bits of (FileMode & os.ModeType) for the LstatCachedFile.Path
+func (file *LstatCachedFile) GetType() (fs.FileMode, error) {
+	if file.fileType != nil {
+		return *file.fileType, nil
+	}
+
+	err := file.lstat()
+	if err != nil {
+		return 0, err
+	}
+
+	return *file.fileType, nil
+}
+
+func (file *LstatCachedFile) lstat() error {
+	fileInfo, err := file.Path.Lstat()
+	if err != nil {
+		return err
+	}
+
+	fileMode := fileInfo.Mode()
+	fileModeType := fileMode & os.ModeType
+
+	file.fileInfo = fileInfo
+	file.fileMode = &fileMode
+	file.fileType = &fileModeType
+
+	return nil
+}
-- 
cgit v1.2.3-70-g09d2