--- /dev/null
+'use strict';
+/**
+ * `list` type prompt
+ */
+
+var _ = {
+ isNumber: require('lodash/isNumber'),
+ findIndex: require('lodash/findIndex'),
+ isString: require('lodash/isString'),
+};
+var chalk = require('chalk');
+var figures = require('figures');
+var cliCursor = require('cli-cursor');
+var runAsync = require('run-async');
+var { flatMap, map, take, takeUntil } = require('rxjs/operators');
+var Base = require('./base');
+var observe = require('../utils/events');
+var Paginator = require('../utils/paginator');
+var incrementListIndex = require('../utils/incrementListIndex');
+
+class ListPrompt extends Base {
+ constructor(questions, rl, answers) {
+ super(questions, rl, answers);
+
+ if (!this.opt.choices) {
+ this.throwParamError('choices');
+ }
+
+ this.firstRender = true;
+ this.selected = 0;
+
+ var def = this.opt.default;
+
+ // If def is a Number, then use as index. Otherwise, check for value.
+ if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) {
+ this.selected = def;
+ } else if (!_.isNumber(def) && def != null) {
+ let index = _.findIndex(this.opt.choices.realChoices, ({ value }) => value === def);
+ this.selected = Math.max(index, 0);
+ }
+
+ // Make sure no default is set (so it won't be printed)
+ this.opt.default = null;
+
+ this.paginator = new Paginator(this.screen);
+ }
+
+ /**
+ * Start the Inquiry session
+ * @param {Function} cb Callback when prompt is done
+ * @return {this}
+ */
+
+ _run(cb) {
+ this.done = cb;
+
+ var self = this;
+
+ var events = observe(this.rl);
+ events.normalizedUpKey.pipe(takeUntil(events.line)).forEach(this.onUpKey.bind(this));
+ events.normalizedDownKey
+ .pipe(takeUntil(events.line))
+ .forEach(this.onDownKey.bind(this));
+ events.numberKey.pipe(takeUntil(events.line)).forEach(this.onNumberKey.bind(this));
+ events.line
+ .pipe(
+ take(1),
+ map(this.getCurrentValue.bind(this)),
+ flatMap((value) => runAsync(self.opt.filter)(value).catch((err) => err))
+ )
+ .forEach(this.onSubmit.bind(this));
+
+ // Init the prompt
+ cliCursor.hide();
+ this.render();
+
+ return this;
+ }
+
+ /**
+ * Render the prompt to screen
+ * @return {ListPrompt} self
+ */
+
+ render() {
+ // Render question
+ var message = this.getQuestion();
+
+ if (this.firstRender) {
+ message += chalk.dim('(Use arrow keys)');
+ }
+
+ // Render choices or answer depending on the state
+ if (this.status === 'answered') {
+ message += chalk.cyan(this.opt.choices.getChoice(this.selected).short);
+ } else {
+ var choicesStr = listRender(this.opt.choices, this.selected);
+ var indexPosition = this.opt.choices.indexOf(
+ this.opt.choices.getChoice(this.selected)
+ );
+ var realIndexPosition =
+ this.opt.choices.reduce(function (acc, value, i) {
+ // Dont count lines past the choice we are looking at
+ if (i > indexPosition) {
+ return acc;
+ }
+ // Add line if it's a separator
+ if (value.type === 'separator') {
+ return acc + 1;
+ }
+
+ var l = value.name;
+ // Non-strings take up one line
+ if (typeof l !== 'string') {
+ return acc + 1;
+ }
+
+ // Calculate lines taken up by string
+ l = l.split('\n');
+ return acc + l.length;
+ }, 0) - 1;
+ message +=
+ '\n' + this.paginator.paginate(choicesStr, realIndexPosition, this.opt.pageSize);
+ }
+
+ this.firstRender = false;
+
+ this.screen.render(message);
+ }
+
+ /**
+ * When user press `enter` key
+ */
+
+ onSubmit(value) {
+ this.status = 'answered';
+
+ // Rerender prompt
+ this.render();
+
+ this.screen.done();
+ cliCursor.show();
+ this.done(value);
+ }
+
+ getCurrentValue() {
+ return this.opt.choices.getChoice(this.selected).value;
+ }
+
+ /**
+ * When user press a key
+ */
+ onUpKey() {
+ this.selected = incrementListIndex(this.selected, 'up', this.opt);
+ this.render();
+ }
+
+ onDownKey() {
+ this.selected = incrementListIndex(this.selected, 'down', this.opt);
+ this.render();
+ }
+
+ onNumberKey(input) {
+ if (input <= this.opt.choices.realLength) {
+ this.selected = input - 1;
+ }
+
+ this.render();
+ }
+}
+
+/**
+ * Function for rendering list choices
+ * @param {Number} pointer Position of the pointer
+ * @return {String} Rendered content
+ */
+function listRender(choices, pointer) {
+ var output = '';
+ var separatorOffset = 0;
+
+ choices.forEach((choice, i) => {
+ if (choice.type === 'separator') {
+ separatorOffset++;
+ output += ' ' + choice + '\n';
+ return;
+ }
+
+ if (choice.disabled) {
+ separatorOffset++;
+ output += ' - ' + choice.name;
+ output += ' (' + (_.isString(choice.disabled) ? choice.disabled : 'Disabled') + ')';
+ output += '\n';
+ return;
+ }
+
+ var isSelected = i - separatorOffset === pointer;
+ var line = (isSelected ? figures.pointer + ' ' : ' ') + choice.name;
+ if (isSelected) {
+ line = chalk.cyan(line);
+ }
+
+ output += line + ' \n';
+ });
+
+ return output.replace(/\n$/, '');
+}
+
+module.exports = ListPrompt;