example: ding dong auto-replyer

examples/ding-dong-bot.js

+const Wechaty = require('../wechaty')
+const log = require('npmlog')
+//log.level = 'verbose'
+
+const welcome = `
+| __        __        _           _         
+| \\ \\      / /__  ___| |__   __ _| |_ _   _ 
+|  \\ \\ /\\ / / _ \\/ __| '_ \\ / _\` | __| | | |
+|   \\ V  V /  __/ (__| | | | (_| | |_| |_| |
+|    \\_/\\_/ \\___|\\___|_| |_|\\__,_|\\__|\\__, |
+|                                     |___/ 
+
+=============== Powered by Wechaty ===============
+-------- https://github.com/zixia/wechaty --------
+
+I'm a bot, my super power is talk in Wechat.
+
+If you send me a 'ding', I will reply you a 'dong'!
+__________________________________________________
+
+Hope you like it, and you are very welcome to 
+upgrade me for more super powers!
+
+Please wait... I'm trying to login in...
+
+`
+
+console.log(welcome)
+
+const bot = new Wechaty()
+bot.init()
+.then(login)
+
+bot.on('message', (m) => {
+	log.info('Bot', 'recv message: %s', m)
+	if (/^ding$/.test(m.get('content'))) {
+		const r = new Wechaty.Message()
+		r.set('to', m.get('from'))
+		r.set('content', 'dong')
+		bot.send(r)
+		.then(() => { log.info('Bot', 'auto replied') })
+	}
+})
+
+function login() {
+	log.info('Bot', 'Welcome to Wechaty')
+
+	bot.puppet
+	.getLoginQrImgUrl()
+	.then(url =>
+		console.log(`\n\nAction needed. Scan the belowing QRCode to login:\n\n${url}\n\nTip: You can copy/paste it to a web browser.\n`) 
+	).catch(e => log.error('Bot', 'promise rejected'))
+}
+
+bot.on('login'	, () => npm.info('Bot', 'logined'))
+bot.on('logout'	, () => npm.info('Bot', 'logouted'))
+