buffalo/cmd/fix/middleware.go
func onlyRelevantFiles(p string, fi os.FileInfo, err error, fn func(p string) error) error {
	if err != nil {
		return err
	}

	if fi.IsDir() {
		base := filepath.Base(p)
		if strings.HasPrefix(base, "_") {
			return filepath.SkipDir
		}
		for _, n := range []string{"vendor", "node_modules", ".git"} {
			if base == n {
				return filepath.SkipDir
			}
		}
		return nil
	}

	ext := filepath.Ext(p)
	if ext != ".go" {
		return nil
	}

	return fn(p)
}
func onlyRelevantFiles(p string, fi os.FileInfo, err error, fn func(p string) error) error {
	if err != nil {
		return err
	}

	if fi.IsDir() {
		base := filepath.Base(p)
		if strings.HasPrefix(base, "_") {
			return filepath.SkipDir
		}
		for _, n := range []string{"vendor", "node_modules", ".git"} {
			if base == n {
				return filepath.SkipDir
			}
		}
		return nil
	}

	ext := filepath.Ext(p)
	if ext != ".go" {
		return nil
	}

	return fn(p)
}
//onlyRelevantFiles processes only .go files excluding folders like node_modules and vendor.