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99 lines
3.0 KiB
99 lines
3.0 KiB
4 years ago
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'use strict';
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const prompts = require('./prompts');
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const passOn = ['suggest', 'format', 'onState', 'validate', 'onRender', 'type'];
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const noop = () => {};
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/**
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* Prompt for a series of questions
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* @param {Array|Object} questions Single question object or Array of question objects
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* @param {Function} [onSubmit] Callback function called on prompt submit
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* @param {Function} [onCancel] Callback function called on cancel/abort
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* @returns {Object} Object with values from user input
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*/
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async function prompt(questions=[], { onSubmit=noop, onCancel=noop }={}) {
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const answers = {};
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const override = prompt._override || {};
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questions = [].concat(questions);
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let answer, question, quit, name, type, lastPrompt;
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const getFormattedAnswer = async (question, answer, skipValidation = false) => {
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if (!skipValidation && question.validate && question.validate(answer) !== true) {
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return;
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}
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return question.format ? await question.format(answer, answers) : answer
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};
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for (question of questions) {
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({ name, type } = question);
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// evaluate type first and skip if type is a falsy value
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if (typeof type === 'function') {
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type = await type(answer, { ...answers }, question)
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question['type'] = type
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}
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if (!type) continue;
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// if property is a function, invoke it unless it's a special function
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for (let key in question) {
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if (passOn.includes(key)) continue;
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let value = question[key];
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question[key] = typeof value === 'function' ? await value(answer, { ...answers }, lastPrompt) : value;
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}
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lastPrompt = question;
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if (typeof question.message !== 'string') {
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throw new Error('prompt message is required');
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}
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// update vars in case they changed
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({ name, type } = question);
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if (prompts[type] === void 0) {
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throw new Error(`prompt type (${type}) is not defined`);
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}
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if (override[question.name] !== undefined) {
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answer = await getFormattedAnswer(question, override[question.name]);
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if (answer !== undefined) {
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answers[name] = answer;
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continue;
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}
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}
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try {
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// Get the injected answer if there is one or prompt the user
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answer = prompt._injected ? getInjectedAnswer(prompt._injected, question.initial) : await prompts[type](question);
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answers[name] = answer = await getFormattedAnswer(question, answer, true);
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quit = await onSubmit(question, answer, answers);
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} catch (err) {
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quit = !(await onCancel(question, answers));
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}
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if (quit) return answers;
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}
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return answers;
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}
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function getInjectedAnswer(injected, deafultValue) {
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const answer = injected.shift();
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if (answer instanceof Error) {
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throw answer;
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}
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return (answer === undefined) ? deafultValue : answer;
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}
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function inject(answers) {
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prompt._injected = (prompt._injected || []).concat(answers);
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}
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function override(answers) {
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prompt._override = Object.assign({}, answers);
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}
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module.exports = Object.assign(prompt, { prompt, prompts, inject, override });
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