func PromptConfirm(prompt string) (bool, error) {
	var (
		input string
		err   error
	)
	prompt = prompt + " [y/N] "

	if liner.TerminalSupported() {
		lr := liner.NewLiner()
		defer lr.Close()
		input, err = lr.Prompt(prompt)
	} else {
		fmt.Print(prompt)
		input, err = bufio.NewReader(os.Stdin).ReadString('\n')
		fmt.Println()
	}

	if len(input) > 0 && strings.ToUpper(input[:1]) == "Y" {
		return true, nil
	} else {
		return false, nil
	}

	return false, err
}

func newLightweightJSRE(libPath string, client comms.EthereumClient, interactive bool) *jsre {
	js := &jsre{ps1: "> "}
	js.wait = make(chan *big.Int)
	js.client = client
	js.ds = docserver.New("/")

	// update state in separare forever blocks
	js.re = re.New(libPath)
	if err := js.apiBindings(js); err != nil {
		utils.Fatalf("Unable to initialize console - %v", err)
	}

	if !liner.TerminalSupported() || !interactive {
		js.prompter = dumbterm{bufio.NewReader(os.Stdin)}
	} else {
		lr := liner.NewLiner()
		js.withHistory(func(hist *os.File) { lr.ReadHistory(hist) })
		lr.SetCtrlCAborts(true)
		js.loadAutoCompletion()
		lr.SetWordCompleter(apiWordCompleter)
		lr.SetTabCompletionStyle(liner.TabPrints)
		js.prompter = lr
		js.atexit = func() {
			js.withHistory(func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
			lr.Close()
			close(js.wait)
		}
	}
	return js
}

func readPassword(prompt string, warnTerm bool) (string, error) {
	if liner.TerminalSupported() {
		lr := liner.NewLiner()
		defer lr.Close()
		return lr.PasswordPrompt(prompt)
	}
	if warnTerm {
		fmt.Println("!! Unsupported terminal, password will be echoed.")
	}
	fmt.Print(prompt)
	input, err := bufio.NewReader(os.Stdin).ReadString('\n')
	fmt.Println()
	return input, err
}

func newJSRE(expanse *exp.Expanse, docRoot, corsDomain string, client comms.ExpanseClient, interactive bool, f xeth.Frontend) *jsre {
	js := &jsre{expanse: expanse, ps1: "> "}

	// set default cors domain used by startRpc from CLI flag
	js.corsDomain = corsDomain
	if f == nil {
		f = js
	}

	js.xeth = xeth.New(expanse, f)

	js.wait = js.xeth.UpdateState()
	js.client = client
	if clt, ok := js.client.(*comms.InProcClient); ok {
		if offeredApis, err := api.ParseApiString(shared.AllApis, codec.JSON, js.xeth, expanse); err == nil {
			clt.Initialize(api.Merge(offeredApis...))
		}
	}

	// update state in separare forever blocks
	js.re = re.New(docRoot)
	if err := js.apiBindings(f); err != nil {
		utils.Fatalf("Unable to connect - %v", err)
	}

	if !liner.TerminalSupported() || !interactive {
		js.prompter = dumbterm{bufio.NewReader(os.Stdin)}
	} else {
		lr := liner.NewLiner()
		js.withHistory(expanse.DataDir, func(hist *os.File) { lr.ReadHistory(hist) })
		lr.SetCtrlCAborts(true)
		js.loadAutoCompletion()
		lr.SetWordCompleter(apiWordCompleter)
		lr.SetTabCompletionStyle(liner.TabPrints)
		js.prompter = lr
		js.atexit = func() {
			js.withHistory(expanse.DataDir, func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
			lr.Close()
			close(js.wait)
		}
	}
	return js
}

func newUserInputReader() *userInputReader {
	r := new(userInputReader)
	// Get the original mode before calling NewLiner.
	// This is usually regular "cooked" mode where characters echo.
	normalMode, _ := liner.TerminalMode()
	// Turn on liner. It switches to raw mode.
	r.State = liner.NewLiner()
	rawMode, err := liner.TerminalMode()
	if err != nil || !liner.TerminalSupported() {
		r.supported = false
	} else {
		r.supported = true
		r.normalMode = normalMode
		r.rawMode = rawMode
		// Switch back to normal mode while we're not prompting.
		normalMode.ApplyMode()
	}
	return r
}

// newTerminalPrompter creates a liner based user input prompter working off the
// standard input and output streams.
func newTerminalPrompter() *terminalPrompter {
	p := new(terminalPrompter)
	// Get the original mode before calling NewLiner.
	// This is usually regular "cooked" mode where characters echo.
	normalMode, _ := liner.TerminalMode()
	// Turn on liner. It switches to raw mode.
	p.State = liner.NewLiner()
	rawMode, err := liner.TerminalMode()
	if err != nil || !liner.TerminalSupported() {
		p.supported = false
	} else {
		p.supported = true
		p.normalMode = normalMode
		p.rawMode = rawMode
		// Switch back to normal mode while we're not prompting.
		normalMode.ApplyMode()
	}
	p.SetCtrlCAborts(true)
	p.SetTabCompletionStyle(liner.TabPrints)

	return p
}

func newJSRE(ethereum *eth.Ethereum, libPath string, interactive bool, corsDomain string) *jsre {
	js := &jsre{ethereum: ethereum, ps1: "> "}
	// set default cors domain used by startRpc from CLI flag
	js.corsDomain = corsDomain
	js.xeth = xeth.New(ethereum, js)
	js.re = re.New(libPath)
	js.apiBindings()
	js.adminBindings()

	if !liner.TerminalSupported() || !interactive {
		js.prompter = dumbterm{bufio.NewReader(os.Stdin)}
	} else {
		lr := liner.NewLiner()
		js.withHistory(func(hist *os.File) { lr.ReadHistory(hist) })
		lr.SetCtrlCAborts(true)
		js.prompter = lr
		js.atexit = func() {
			js.withHistory(func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
			lr.Close()
		}
	}
	return js
}