@sap/cds-dk/lib/mtx/util/question.js

Command line client and development toolkit for the SAP Cloud Application Programming Model

const readline = require('readline');

module.exports = class Question {

    static askQuestion(question, defaultValue, hidden = false) {
        const rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout
        });

        if (defaultValue) {
            question += '(' + defaultValue + ') ';
        }
        return new Promise(resolve => {
            rl.question(question, answer => {
                answer = answer.replace(/\r?\n|\r/g, '');
                if (answer.length === 0 && defaultValue) {
                    answer = defaultValue;
                }
                resolve(answer);
                rl.close();
            });

            if (hidden) {
                const rla = rl;
                rla._writeToOutput = function _writeToOutput() {
                    rla.output.write('*');
                };
            }
        });
    }

    static askBooleanQuestion(question) {
        const rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout
        });

        return new Promise(resolve => {
            rl.question(question, answer => {
                if (answer === 'y' || answer === 'Y') {
                    resolve(true);
                } else {
                    resolve(false);
                }
                rl.close();
            });
        });
    }
}