update

type CommandRunner func(name string, arg ...string) *exec.Cmd

type DefaultFileHandler struct{}

type DefaultHTTPClient struct{}

type FileHandler interface {
	CreateTemp(dir, pattern string) (*os.File, error)
	WriteFile(filename string, data []byte, perm os.FileMode) error
	Chmod(name string, mode os.FileMode) error
	Rename(oldpath, newpath string) error
}

type HTTPClient interface {
	Get(url string) (*http.Response, error)
}

type Updater struct {
	Version           string
	BaseURL           string
	URLTemplate       string
	HTTPClient        HTTPClient
	FileHandler       FileHandler
	GetExecPath       func() string
	DetectPlatform    func() string
	DownloadAndUpdate func(url string) error
	CommandRunner     CommandRunner
}