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node_modules/inquirer/lib/prompts/list.js

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+'use strict';
+/**
+ * `list` type prompt
+ */
+
+var _ = require('lodash');
+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');
+
+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)
+      );
+      message +=
+        '\n' + this.paginator.paginate(choicesStr, indexPosition, 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() {
+    var len = this.opt.choices.realLength;
+    this.selected = this.selected > 0 ? this.selected - 1 : len - 1;
+    this.render();
+  }
+
+  onDownKey() {
+    var len = this.opt.choices.realLength;
+    this.selected = this.selected < len - 1 ? this.selected + 1 : 0;
+    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;