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node_modules/inquirer/lib/prompts/rawlist.js

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+'use strict';
+/**
+ * `rawlist` type prompt
+ */
+
+var _ = require('lodash');
+var chalk = require('chalk');
+var { map, takeUntil } = require('rxjs/operators');
+var Base = require('./base');
+var Separator = require('../objects/separator');
+var observe = require('../utils/events');
+var Paginator = require('../utils/paginator');
+
+class RawListPrompt extends Base {
+  constructor(questions, rl, answers) {
+    super(questions, rl, answers);
+
+    if (!this.opt.choices) {
+      this.throwParamError('choices');
+    }
+
+    this.opt.validChoices = this.opt.choices.filter(Separator.exclude);
+
+    this.selected = 0;
+    this.rawDefault = 0;
+
+    _.extend(this.opt, {
+      validate: function(val) {
+        return val != null;
+      }
+    });
+
+    var def = this.opt.default;
+    if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) {
+      this.selected = def;
+      this.rawDefault = def;
+    } else if (!_.isNumber(def) && def != null) {
+      let index = _.findIndex(this.opt.choices.realChoices, ({ value }) => value === def);
+      let safeIndex = Math.max(index, 0);
+      this.selected = safeIndex;
+      this.rawDefault = safeIndex;
+    }
+
+    // Make sure no default is set (so it won't be printed)
+    this.opt.default = null;
+
+    this.paginator = new Paginator();
+  }
+
+  /**
+   * Start the Inquiry session
+   * @param  {Function} cb      Callback when prompt is done
+   * @return {this}
+   */
+
+  _run(cb) {
+    this.done = cb;
+
+    // Once user confirm (enter key)
+    var events = observe(this.rl);
+    var submit = events.line.pipe(map(this.getCurrentValue.bind(this)));
+
+    var validation = this.handleSubmitEvents(submit);
+    validation.success.forEach(this.onEnd.bind(this));
+    validation.error.forEach(this.onError.bind(this));
+
+    events.normalizedUpKey.pipe(takeUntil(events.line)).forEach(this.onUpKey.bind(this));
+    events.normalizedDownKey
+      .pipe(takeUntil(events.line))
+      .forEach(this.onDownKey.bind(this));
+    events.keypress
+      .pipe(takeUntil(validation.success))
+      .forEach(this.onKeypress.bind(this));
+    // Init the prompt
+    this.render();
+
+    return this;
+  }
+
+  /**
+   * Render the prompt to screen
+   * @return {RawListPrompt} self
+   */
+
+  render(error) {
+    // Render question
+    var message = this.getQuestion();
+    var bottomContent = '';
+
+    if (this.status === 'answered') {
+      message += chalk.cyan(this.answer);
+    } else {
+      var choicesStr = renderChoices(this.opt.choices, this.selected);
+      message +=
+        '\n' + this.paginator.paginate(choicesStr, this.selected, this.opt.pageSize);
+      message += '\n  Answer: ';
+    }
+    message += this.rl.line;
+
+    if (error) {
+      bottomContent = '\n' + chalk.red('>> ') + error;
+    }
+
+    this.screen.render(message, bottomContent);
+  }
+
+  /**
+   * When user press `enter` key
+   */
+
+  getCurrentValue(index) {
+    if (index == null) {
+      index = this.rawDefault;
+    } else if (index === '') {
+      index = this.selected;
+    } else {
+      index -= 1;
+    }
+
+    var choice = this.opt.choices.getChoice(index);
+    return choice ? choice.value : null;
+  }
+
+  onEnd(state) {
+    this.status = 'answered';
+    this.answer = state.value;
+
+    // Re-render prompt
+    this.render();
+
+    this.screen.done();
+    this.done(state.value);
+  }
+
+  onError() {
+    this.render('Please enter a valid index');
+  }
+
+  /**
+   * When user press a key
+   */
+
+  onKeypress() {
+    var index = this.rl.line.length ? Number(this.rl.line) - 1 : 0;
+
+    if (this.opt.choices.getChoice(index)) {
+      this.selected = index;
+    } else {
+      this.selected = undefined;
+    }
+    this.render();
+  }
+
+  /**
+   * When user press up key
+   */
+
+  onUpKey() {
+    this.onArrowKey('up');
+  }
+
+  /**
+   * When user press down key
+   */
+
+  onDownKey() {
+    this.onArrowKey('down');
+  }
+
+  /**
+   * When user press up or down key
+   * @param {String} type Arrow type: up or down
+   */
+
+  onArrowKey(type) {
+    var len = this.opt.choices.realLength;
+
+    if (type === 'up') this.selected = this.selected > 0 ? this.selected - 1 : len - 1;
+    else this.selected = this.selected < len - 1 ? this.selected + 1 : 0;
+
+    this.rl.line = String(this.selected + 1);
+  }
+}
+
+/**
+ * Function for rendering list choices
+ * @param  {Number} pointer Position of the pointer
+ * @return {String}         Rendered content
+ */
+
+function renderChoices(choices, pointer) {
+  var output = '';
+  var separatorOffset = 0;
+
+  choices.forEach(function(choice, i) {
+    output += '\n  ';
+
+    if (choice.type === 'separator') {
+      separatorOffset++;
+      output += ' ' + choice;
+      return;
+    }
+
+    var index = i - separatorOffset;
+    var display = index + 1 + ') ' + choice.name;
+    if (index === pointer) {
+      display = chalk.cyan(display);
+    }
+
+    output += display;
+  });
+
+  return output;
+}
+
+module.exports = RawListPrompt;