refactor: use shared functions

pkg/file/stat.go

@@ -2,6 +2,7 @@ package file
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 )
 
@@ -25,38 +26,26 @@ func Exists(path string) (bool, error) {
 //
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsDir(path string) bool {
-	fileInfo, err := os.Stat(path)
-	if os.IsNotExist(err) {
-		return false
-	}
-
-	return fileInfo.IsDir()
+	return isFileMode(path, os.ModeDir)
 }
 
 // IsRegular returns true if the given path is a regular file
 //
 // It resolves all symbolic links
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsRegular(path string) bool {
-	fileInfo, err := os.Stat(path)
-	if os.IsNotExist(err) {
-		return false
+	if s, err := os.Stat(path); err == nil {
+		return s.Mode().IsRegular()
 	}
-
-	return fileInfo.Mode().IsRegular()
+	return false
 }
 
 // IsSymlink returns true if the given path is a symlink
 //
 // It does not resolve any symbolic links
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsSymlink(path string) bool {
-	fileInfo, err := os.Lstat(path)
-	if os.IsNotExist(err) {
-		return false
-	}
-
-	return fileInfo.Mode()&os.ModeSymlink == os.ModeSymlink
+	return isFileModeL(path, os.ModeSymlink)
 }
 
 // IsNamedPipe returns true if the given path is a named pipe
@@ -77,35 +66,44 @@ func IsNamedPipe(path string) bool {
 // It resolves all symbolic links
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsSocket(path string) bool {
-	fileInfo, err := os.Stat(path)
-	if os.IsNotExist(err) {
-		return false
-	}
-
-	return fileInfo.Mode()&os.ModeSocket == os.ModeSocket
+	return isFileMode(path, os.ModeSocket)
 }
 
 // IsDevice returns true if the given path is a device
 //
 // It resolves all symbolic links
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsDevice(path string) bool {
-	fileInfo, err := os.Stat(path)
-	if os.IsNotExist(err) {
-		return false
-	}
-
-	return fileInfo.Mode()&os.ModeDevice == os.ModeDevice
+	return isFileMode(path, os.ModeDevice)
 }
 
 // IsFile returns true if the given path is a regular file, symlink, socket, or device
 //
 // It returns false on any error, e.g. if the file does not exist or on insufficient permissions
 func IsFile(path string) bool {
-	exists, err := Exists(path)
-	if err != nil {
-		return false
+	return IsRegular(path) ||
+		IsSymlink(path) ||
+		IsNamedPipe(path) ||
+		IsSocket(path) ||
+		IsDevice(path)
+}
+
+// isFileMode returns true if the given path has the given file mode, resolving any symbolic links
+//
+// It returns false on any error, e.g. if the file does not exist or on insufficient permissions
+func isFileMode(path string, fileMode fs.FileMode) bool {
+	if s, err := os.Stat(path); err == nil {
+		return s.Mode()&fileMode != 0
 	}
+	return false
+}
 
-	return exists && !IsDir(path)
+// isFileModeL returns true if the given path has the given file mode, not resolving any symbolic links
+//
+// It returns false on any error, e.g. if the file does not exist or on insufficient permissions
+func isFileModeL(path string, fileMode fs.FileMode) bool {
+	if s, err := os.Lstat(path); err == nil {
+		return s.Mode()&fileMode != 0
+	}
+	return false
 }