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node_modules/inquirer/lib/prompts/base.js

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+'use strict';
+/**
+ * Base prompt implementation
+ * Should be extended by prompt types.
+ */
+
+var _ = require('lodash');
+var chalk = require('chalk');
+var runAsync = require('run-async');
+var { filter, flatMap, share, take, takeUntil } = require('rxjs/operators');
+var Choices = require('../objects/choices');
+var ScreenManager = require('../utils/screen-manager');
+
+class Prompt {
+  constructor(question, rl, answers) {
+    // Setup instance defaults property
+    _.assign(this, {
+      answers: answers,
+      status: 'pending'
+    });
+
+    // Set defaults prompt options
+    this.opt = _.defaults(_.clone(question), {
+      validate: () => true,
+      filter: val => val,
+      when: () => true,
+      suffix: '',
+      prefix: chalk.green('?')
+    });
+
+    // Make sure name is present
+    if (!this.opt.name) {
+      this.throwParamError('name');
+    }
+
+    // Set default message if no message defined
+    if (!this.opt.message) {
+      this.opt.message = this.opt.name + ':';
+    }
+
+    // Normalize choices
+    if (Array.isArray(this.opt.choices)) {
+      this.opt.choices = new Choices(this.opt.choices, answers);
+    }
+
+    this.rl = rl;
+    this.screen = new ScreenManager(this.rl);
+  }
+
+  /**
+   * Start the Inquiry session and manage output value filtering
+   * @return {Promise}
+   */
+
+  run() {
+    return new Promise(resolve => {
+      this._run(value => resolve(value));
+    });
+  }
+
+  // Default noop (this one should be overwritten in prompts)
+  _run(cb) {
+    cb();
+  }
+
+  /**
+   * Throw an error telling a required parameter is missing
+   * @param  {String} name Name of the missing param
+   * @return {Throw Error}
+   */
+
+  throwParamError(name) {
+    throw new Error('You must provide a `' + name + '` parameter');
+  }
+
+  /**
+   * Called when the UI closes. Override to do any specific cleanup necessary
+   */
+  close() {
+    this.screen.releaseCursor();
+  }
+
+  /**
+   * Run the provided validation method each time a submit event occur.
+   * @param  {Rx.Observable} submit - submit event flow
+   * @return {Object}        Object containing two observables: `success` and `error`
+   */
+  handleSubmitEvents(submit) {
+    var self = this;
+    var validate = runAsync(this.opt.validate);
+    var asyncFilter = runAsync(this.opt.filter);
+    var validation = submit.pipe(
+      flatMap(value =>
+        asyncFilter(value, self.answers).then(
+          filteredValue =>
+            validate(filteredValue, self.answers).then(
+              isValid => ({ isValid: isValid, value: filteredValue }),
+              err => ({ isValid: err, value: filteredValue })
+            ),
+          err => ({ isValid: err })
+        )
+      ),
+      share()
+    );
+
+    var success = validation.pipe(
+      filter(state => state.isValid === true),
+      take(1)
+    );
+    var error = validation.pipe(
+      filter(state => state.isValid !== true),
+      takeUntil(success)
+    );
+
+    return {
+      success: success,
+      error: error
+    };
+  }
+
+  /**
+   * Generate the prompt question string
+   * @return {String} prompt question string
+   */
+
+  getQuestion() {
+    var message =
+      this.opt.prefix +
+      ' ' +
+      chalk.bold(this.opt.message) +
+      this.opt.suffix +
+      chalk.reset(' ');
+
+    // Append the default if available, and if question isn't answered
+    if (this.opt.default != null && this.status !== 'answered') {
+      // If default password is supplied, hide it
+      if (this.opt.type === 'password') {
+        message += chalk.italic.dim('[hidden] ');
+      } else {
+        message += chalk.dim('(' + this.opt.default + ') ');
+      }
+    }
+
+    return message;
+  }
+}
+
+module.exports = Prompt;