--- /dev/null
+'use strict';
+/**
+ * `password` type prompt
+ */
+
+var chalk = require('chalk');
+var { map, takeUntil } = require('rxjs/operators');
+var Base = require('./base');
+var observe = require('../utils/events');
+
+function mask(input, maskChar) {
+ input = String(input);
+ maskChar = typeof maskChar === 'string' ? maskChar : '*';
+ if (input.length === 0) {
+ return '';
+ }
+
+ return new Array(input.length + 1).join(maskChar);
+}
+
+class PasswordPrompt extends Base {
+ /**
+ * Start the Inquiry session
+ * @param {Function} cb Callback when prompt is done
+ * @return {this}
+ */
+
+ _run(cb) {
+ this.done = cb;
+
+ var events = observe(this.rl);
+
+ // Once user confirm (enter key)
+ var submit = events.line.pipe(map(this.filterInput.bind(this)));
+
+ var validation = this.handleSubmitEvents(submit);
+ validation.success.forEach(this.onEnd.bind(this));
+ validation.error.forEach(this.onError.bind(this));
+
+ events.keypress
+ .pipe(takeUntil(validation.success))
+ .forEach(this.onKeypress.bind(this));
+
+ // Init
+ this.render();
+
+ return this;
+ }
+
+ /**
+ * Render the prompt to screen
+ * @return {PasswordPrompt} self
+ */
+
+ render(error) {
+ var message = this.getQuestion();
+ var bottomContent = '';
+
+ if (this.status === 'answered') {
+ message += this.opt.mask
+ ? chalk.cyan(mask(this.answer, this.opt.mask))
+ : chalk.italic.dim('[hidden]');
+ } else if (this.opt.mask) {
+ message += mask(this.rl.line || '', this.opt.mask);
+ } else {
+ message += chalk.italic.dim('[input is hidden] ');
+ }
+
+ if (error) {
+ bottomContent = '\n' + chalk.red('>> ') + error;
+ }
+
+ this.screen.render(message, bottomContent);
+ }
+
+ /**
+ * When user press `enter` key
+ */
+
+ filterInput(input) {
+ if (!input) {
+ return this.opt.default == null ? '' : this.opt.default;
+ }
+
+ return input;
+ }
+
+ onEnd(state) {
+ this.status = 'answered';
+ this.answer = state.value;
+
+ // Re-render prompt
+ this.render();
+
+ this.screen.done();
+ this.done(state.value);
+ }
+
+ onError(state) {
+ this.render(state.isValid);
+ }
+
+ onKeypress() {
+ // If user press a key, just clear the default value
+ if (this.opt.default) {
+ this.opt.default = undefined;
+ }
+
+ this.render();
+ }
+}
+
+module.exports = PasswordPrompt;