Fixed fs package tests on Windows

src/fs/Walk_windows.go

@@ -2,23 +2,27 @@
 
 package fs
 
-import (
-	"io/fs"
-	"path/filepath"
-	"strings"
-)
+import "os"
 
 // Walk calls your callback function for every file name inside the directory.
 // It doesn't distinguish between files and directories.
 func Walk(directory string, callBack func(string)) error {
-	return filepath.WalkDir(directory, func(path string, d fs.DirEntry, err error) error {
-		fileName := d.Name()
+	f, err := os.Open(directory)
 
-		if strings.HasPrefix(fileName, ".") {
-			return filepath.SkipDir
-		}
+	if err != nil {
+		return err
+	}
 
-		callBack(fileName)
-		return nil
-	})
+	files, err := f.Readdirnames(0)
+	f.Close()
+
+	if err != nil {
+		return err
+	}
+
+	for _, file := range files {
+		callBack(file)
+	}
+
+	return nil
 }

src/fs/bench_test.go

@@ -0,0 +1,45 @@
+package fs_test
+
+import (
+	"os"
+	"testing"
+
+	"git.akyoto.dev/cli/q/src/fs"
+	"git.akyoto.dev/go/assert"
+)
+
+func BenchmarkReadDir(b *testing.B) {
+	for b.Loop() {
+		files, err := os.ReadDir(".")
+		assert.Nil(b, err)
+
+		for _, file := range files {
+			func(string) {}(file.Name())
+		}
+	}
+}
+
+func BenchmarkReaddirnames(b *testing.B) {
+	for b.Loop() {
+		f, err := os.Open(".")
+		assert.Nil(b, err)
+		files, err := f.Readdirnames(0)
+		assert.Nil(b, err)
+
+		for _, file := range files {
+			func(string) {}(file)
+		}
+
+		f.Close()
+	}
+}
+
+func BenchmarkWalk(b *testing.B) {
+	for b.Loop() {
+		err := fs.Walk(".", func(file string) {
+			func(string) {}(file)
+		})
+
+		assert.Nil(b, err)
+	}
+}