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index.js
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index.js
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'use strict'
const stdin = process.stdin
const stderr = process.stderr
const MODE_HIDE = 'hide'
const MODE_MASK = 'mask'
const MODE_CHOKE = 'choke'
const read = {
[MODE_HIDE]: ask => read.raw(ask, MODE_HIDE),
[MODE_MASK]: ask => read.raw(ask, MODE_MASK),
[MODE_CHOKE]: ask => read.raw(ask, MODE_CHOKE),
raw: (ask, mode) => {
// masking isn't available without setRawMode
if (!stdin.setRawMode || process.env.TERM === 'dumb') return read.notty(ask)
return new Promise(function (resolve, reject) {
const ansi = require('ansi-escapes')
let input = ''
stderr.write(ansi.eraseLine)
stderr.write(ansi.cursorLeft)
stderr.write(ask)
stdin.resume()
stdin.setRawMode(true)
function stop () {
if (mode === MODE_MASK) {
stderr.write(ansi.cursorHide + ansi.cursorLeft + ask + input.replace(/./g, '*') + '\n' + ansi.cursorShow)
} else {
stderr.write('\n')
}
stdin.removeListener('data', fn)
stdin.setRawMode(false)
stdin.pause()
}
function enter () {
if (input.length === 0) return
stop()
input = input.replace(/\r$/, '')
resolve(input)
}
function ctrlc () {
reject(new Error('SIGINT'))
stop()
}
function backspace () {
if (input.length === 0) return
input = input.substr(0, input.length - 1)
stderr.write(ansi.cursorBackward(1))
stderr.write(ansi.eraseEndLine)
}
const out = {
[MODE_HIDE]: c => '*'.repeat(c.length),
[MODE_MASK]: c => c,
[MODE_CHOKE]: null,
};
function newchar (c) {
input += c
out[mode] && stderr.write(out[mode](c));
}
let fn = function (c) {
switch (c) {
case '\u0004': // Ctrl-d
case '\r':
case '\n':
return enter()
case '\u0003': // Ctrl-c
return ctrlc()
default:
// backspace
if (c.charCodeAt(0) === 127) return backspace()
else return newchar(c)
}
}
stdin.on('data', fn)
})
},
notty: ask => {
return new Promise((resolve, reject) => {
const spawn = require('cross-spawn')
stderr.write(ask)
let output = spawn.sync('sh', ['-c', 'read -s PASS && echo $PASS'], {
stdio: ['inherit', 'pipe', 'inherit'],
encoding: 'utf8'
})
stderr.write('\n')
if (output.error) return reject(output.error)
resolve(output.stdout.trim())
})
}
}
/**
* prompt -- Prompt for a password
* @module password-prompt
* @example
* let prompt = require('password-prompt')
* let password = prompt('password: ')
* // password: ******
* @param {string} [ask] - prompt output
* @param {Object} [options]
* @param {string} [options.method=mask] - mask or hide
* @returns {Promise<string>} input from user
*/
function prompt (ask, options) {
options = Object.assign(
{
method: 'mask'
},
options
)
stdin.setEncoding('utf8')
return read[options.method](ask).then(input => input || prompt(ask))
}
module.exports = prompt