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'use strict';
const Events = require('events');
const colors = require('ansi-colors');
const keypress = require('./keypress');
const timer = require('./timer');
const State = require('./state');
const theme = require('./theme');
const utils = require('./utils');
const ansi = require('./ansi');
/**
* Base class for creating a new Prompt.
* @param {Object} `options` Question object.
*/
class Prompt extends Events {
constructor(options = {}) {
super();
this.name = options.name;
this.type = options.type;
this.options = options;
theme(this);
timer(this);
this.state = new State(this);
this.initial = [options.initial, options.default].find(v => v != null);
this.stdout = options.stdout || process.stdout;
this.stdin = options.stdin || process.stdin;
this.scale = options.scale || 1;
this.term = this.options.term || process.env.TERM_PROGRAM;
this.margin = margin(this.options.margin);
this.setMaxListeners(0);
setOptions(this);
}
async keypress(input, event = {}) {
this.keypressed = true;
let key = keypress.action(input, keypress(input, event), this.options.actions);
this.state.keypress = key;
this.emit('keypress', input, key);
this.emit('state', this.state.clone());
let fn = this.options[key.action] || this[key.action] || this.dispatch;
if (typeof fn === 'function') {
return await fn.call(this, input, key);
}
this.alert();
}
alert() {
delete this.state.alert;
if (this.options.show === false) {
this.emit('alert');
} else {
this.stdout.write(ansi.code.beep);
}
}
cursorHide() {
this.stdout.write(ansi.cursor.hide());
utils.onExit(() => this.cursorShow());
}
cursorShow() {
this.stdout.write(ansi.cursor.show());
}
write(str) {
if (!str) return;
if (this.stdout && this.state.show !== false) {
this.stdout.write(str);
}
this.state.buffer += str;
}
clear(lines = 0) {
let buffer = this.state.buffer;
this.state.buffer = '';
if ((!buffer && !lines) || this.options.show === false) return;
this.stdout.write(ansi.cursor.down(lines) + ansi.clear(buffer, this.width));
}
restore() {
if (this.state.closed || this.options.show === false) return;
let { prompt, after, rest } = this.sections();
let { cursor, initial = '', input = '', value = '' } = this;
let size = this.state.size = rest.length;
let state = { after, cursor, initial, input, prompt, size, value };
let codes = ansi.cursor.restore(state);
if (codes) {
this.stdout.write(codes);
}
}
sections() {
let { buffer, input, prompt } = this.state;
prompt = colors.unstyle(prompt);
let buf = colors.unstyle(buffer);
let idx = buf.indexOf(prompt);
let header = buf.slice(0, idx);
let rest = buf.slice(idx);
let lines = rest.split('\n');
let first = lines[0];
let last = lines[lines.length - 1];
let promptLine = prompt + (input ? ' ' + input : '');
let len = promptLine.length;
let after = len < first.length ? first.slice(len + 1) : '';
return { header, prompt: first, after, rest: lines.slice(1), last };
}
async submit() {
this.state.submitted = true;
this.state.validating = true;
// this will only be called when the prompt is directly submitted
// without initializing, i.e. when the prompt is skipped, etc. Otherwize,
// "options.onSubmit" is will be handled by the "initialize()" method.
if (this.options.onSubmit) {
await this.options.onSubmit.call(this, this.name, this.value, this);
}
let result = this.state.error || await this.validate(this.value, this.state);
if (result !== true) {
let error = '\n' + this.symbols.pointer + ' ';
if (typeof result === 'string') {
error += result.trim();
} else {
error += 'Invalid input';
}
this.state.error = '\n' + this.styles.danger(error);
this.state.submitted = false;
await this.render();
await this.alert();
this.state.validating = false;
this.state.error = void 0;
return;
}
this.state.validating = false;
await this.render();
await this.close();
this.value = await this.result(this.value);
this.emit('submit', this.value);
}
async cancel(err) {
this.state.cancelled = this.state.submitted = true;
await this.render();
await this.close();
if (typeof this.options.onCancel === 'function') {
await this.options.onCancel.call(this, this.name, this.value, this);
}
this.emit('cancel', await this.error(err));
}
async close() {
this.state.closed = true;
try {
let sections = this.sections();
let lines = Math.ceil(sections.prompt.length / this.width);
if (sections.rest) {
this.write(ansi.cursor.down(sections.rest.length));
}
this.write('\n'.repeat(lines));
} catch (err) { /* do nothing */ }
this.emit('close');
}
start() {
if (!this.stop && this.options.show !== false) {
this.stop = keypress.listen(this, this.keypress.bind(this));
this.once('close', this.stop);
}
}
async skip() {
this.skipped = this.options.skip === true;
if (typeof this.options.skip === 'function') {
this.skipped = await this.options.skip.call(this, this.name, this.value);
}
return this.skipped;
}
async initialize() {
let { format, options, result } = this;
this.format = () => format.call(this, this.value);
this.result = () => result.call(this, this.value);
if (typeof options.initial === 'function') {
this.initial = await options.initial.call(this, this);
}
if (typeof options.onRun === 'function') {
await options.onRun.call(this, this);
}
// if "options.onSubmit" is defined, we wrap the "submit" method to guarantee
// that "onSubmit" will always called first thing inside the submit
// method, regardless of how it's handled in inheriting prompts.
if (typeof options.onSubmit === 'function') {
let onSubmit = options.onSubmit.bind(this);
let submit = this.submit.bind(this);
delete this.options.onSubmit;
this.submit = async() => {
await onSubmit(this.name, this.value, this);
return submit();
};
}
await this.start();
await this.render();
}
render() {
throw new Error('expected prompt to have a custom render method');
}
run() {
return new Promise(async(resolve, reject) => {
this.once('submit', resolve);
this.once('cancel', reject);
if (await this.skip()) {
this.render = () => {};
return this.submit();
}
await this.initialize();
this.emit('run');
});
}
async element(name, choice, i) {
let { options, state, symbols, timers } = this;
let timer = timers && timers[name];
state.timer = timer;
let value = options[name] || state[name] || symbols[name];
let val = choice && choice[name] != null ? choice[name] : await value;
if (val === '') return val;
let res = await this.resolve(val, state, choice, i);
if (!res && choice && choice[name]) {
return this.resolve(value, state, choice, i);
}
return res;
}
async prefix() {
let element = await this.element('prefix') || this.symbols;
let timer = this.timers && this.timers.prefix;
let state = this.state;
state.timer = timer;
if (utils.isObject(element)) element = element[state.status] || element.pending;
if (!utils.hasColor(element)) {
let style = this.styles[state.status] || this.styles.pending;
return style(element);
}
return element;
}
async message() {
let message = await this.element('message');
if (!utils.hasColor(message)) {
return this.styles.strong(message);
}
return message;
}
async separator() {
let element = await this.element('separator') || this.symbols;
let timer = this.timers && this.timers.separator;
let state = this.state;
state.timer = timer;
let value = element[state.status] || element.pending || state.separator;
let ele = await this.resolve(value, state);
if (utils.isObject(ele)) ele = ele[state.status] || ele.pending;
if (!utils.hasColor(ele)) {
return this.styles.muted(ele);
}
return ele;
}
async pointer(choice, i) {
let val = await this.element('pointer', choice, i);
if (typeof val === 'string' && utils.hasColor(val)) {
return val;
}
if (val) {
let styles = this.styles;
let focused = this.index === i;
let style = focused ? styles.primary : val => val;
let ele = await this.resolve(val[focused ? 'on' : 'off'] || val, this.state);
let styled = !utils.hasColor(ele) ? style(ele) : ele;
return focused ? styled : ' '.repeat(ele.length);
}
}
async indicator(choice, i) {
let val = await this.element('indicator', choice, i);
if (typeof val === 'string' && utils.hasColor(val)) {
return val;
}
if (val) {
let styles = this.styles;
let enabled = choice.enabled === true;
let style = enabled ? styles.success : styles.dark;
let ele = val[enabled ? 'on' : 'off'] || val;
return !utils.hasColor(ele) ? style(ele) : ele;
}
return '';
}
body() {
return null;
}
footer() {
if (this.state.status === 'pending') {
return this.element('footer');
}
}
header() {
if (this.state.status === 'pending') {
return this.element('header');
}
}
async hint() {
if (this.state.status === 'pending' && !this.isValue(this.state.input)) {
let hint = await this.element('hint');
if (!utils.hasColor(hint)) {
return this.styles.muted(hint);
}
return hint;
}
}
error(err) {
return !this.state.submitted ? (err || this.state.error) : '';
}
format(value) {
return value;
}
result(value) {
return value;
}
validate(value) {
if (this.options.required === true) {
return this.isValue(value);
}
return true;
}
isValue(value) {
return value != null && value !== '';
}
resolve(value, ...args) {
return utils.resolve(this, value, ...args);
}
get base() {
return Prompt.prototype;
}
get style() {
return this.styles[this.state.status];
}
get height() {
return this.options.rows || utils.height(this.stdout, 25);
}
get width() {
return this.options.columns || utils.width(this.stdout, 80);
}
get size() {
return { width: this.width, height: this.height };
}
set cursor(value) {
this.state.cursor = value;
}
get cursor() {
return this.state.cursor;
}
set input(value) {
this.state.input = value;
}
get input() {
return this.state.input;
}
set value(value) {
this.state.value = value;
}
get value() {
let { input, value } = this.state;
let result = [value, input].find(this.isValue.bind(this));
return this.isValue(result) ? result : this.initial;
}
static get prompt() {
return options => new this(options).run();
}
}
function setOptions(prompt) {
let isValidKey = key => {
return prompt[key] === void 0 || typeof prompt[key] === 'function';
};
let ignore = [
'actions',
'choices',
'initial',
'margin',
'roles',
'styles',
'symbols',
'theme',
'timers',
'value'
];
let ignoreFn = [
'body',
'footer',
'error',
'header',
'hint',
'indicator',
'message',
'prefix',
'separator',
'skip'
];
for (let key of Object.keys(prompt.options)) {
if (ignore.includes(key)) continue;
if (/^on[A-Z]/.test(key)) continue;
let option = prompt.options[key];
if (typeof option === 'function' && isValidKey(key)) {
if (!ignoreFn.includes(key)) {
prompt[key] = option.bind(prompt);
}
} else if (typeof prompt[key] !== 'function') {
prompt[key] = option;
}
}
}
function margin(value) {
if (typeof value === 'number') {
value = [value, value, value, value];
}
let arr = [].concat(value || []);
let pad = i => i % 2 === 0 ? '\n' : ' ';
let res = [];
for (let i = 0; i < 4; i++) {
let char = pad(i);
if (arr[i]) {
res.push(char.repeat(arr[i]));
} else {
res.push('');
}
}
return res;
}
module.exports = Prompt;