99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
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// Copyright 2016 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package utils
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import (
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"fmt"
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"strings"
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"github.com/peterh/liner"
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)
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// Holds the stdin line reader.
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// Only this reader may be used for input because it keeps
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// an internal buffer.
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var Stdin = newUserInputReader()
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type userInputReader struct {
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*liner.State
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warned bool
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supported bool
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normalMode liner.ModeApplier
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rawMode liner.ModeApplier
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}
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func newUserInputReader() *userInputReader {
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r := new(userInputReader)
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// Get the original mode before calling NewLiner.
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// This is usually regular "cooked" mode where characters echo.
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normalMode, _ := liner.TerminalMode()
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// Turn on liner. It switches to raw mode.
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r.State = liner.NewLiner()
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rawMode, err := liner.TerminalMode()
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if err != nil || !liner.TerminalSupported() {
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r.supported = false
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} else {
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r.supported = true
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r.normalMode = normalMode
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r.rawMode = rawMode
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// Switch back to normal mode while we're not prompting.
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normalMode.ApplyMode()
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}
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return r
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}
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func (r *userInputReader) Prompt(prompt string) (string, error) {
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if r.supported {
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r.rawMode.ApplyMode()
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defer r.normalMode.ApplyMode()
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} else {
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// liner tries to be smart about printing the prompt
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// and doesn't print anything if input is redirected.
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// Un-smart it by printing the prompt always.
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fmt.Print(prompt)
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prompt = ""
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defer fmt.Println()
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}
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return r.State.Prompt(prompt)
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}
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func (r *userInputReader) PasswordPrompt(prompt string) (passwd string, err error) {
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if r.supported {
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r.rawMode.ApplyMode()
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defer r.normalMode.ApplyMode()
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return r.State.PasswordPrompt(prompt)
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}
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if !r.warned {
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fmt.Println("!! Unsupported terminal, password will be echoed.")
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r.warned = true
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}
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// Just as in Prompt, handle printing the prompt here instead of relying on liner.
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fmt.Print(prompt)
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passwd, err = r.State.Prompt("")
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fmt.Println()
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return passwd, err
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}
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func (r *userInputReader) ConfirmPrompt(prompt string) (bool, error) {
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prompt = prompt + " [y/N] "
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input, err := r.Prompt(prompt)
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if len(input) > 0 && strings.ToUpper(input[:1]) == "Y" {
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return true, nil
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}
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return false, err
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}
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