倉庫readlineの簡単な使用

var readline = require('readline');
var prefix = '> ';
var rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        completer: function(line) {// Tab ，    
            var completions = 'hello exit bye quit'.split(' ')
            var hits = completions.filter(function(c) {
                if (c.indexOf(line) == 0) {
                    return c;
                }
            });
            return [hits && hits.length ? hits : completions, line];
        },
        terminal: true
    });
var name;

rl.on('line', function(line) {//    
    switch(line.trim()) {
        case 'hello':
        console.log('hello ' + name);
            break;
        case 'exit':
        case 'quit':
        case 'bye':
            rl.close();
            break;
        default:
            console.log('Say what? I might have heard `' + line.trim() + '`');
            break;
    }
    rl.prompt(true);
}).on('SIGINT', function() {//  Ctrl + C
    rl.question('Sure to exit ? ', function(answer) {
        if (answer.match(/^y(es)?$/i)) {
            rl.close();
        }else {
            rl.prompt(true);
        }
    });
}).on('close', function() {//    
    console.log('Bye! Have a good day!');
    process.exit(0);
});

rl.setPrompt(prefix);
rl.prompt(true);

rl.question('What is your name?', function(answer) {
    console.log('welcome you, ' + answer);
    name = answer;
    rl.prompt(true);
});