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build/node_modules/inquirer/lib/ui/baseUI.js

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+'use strict';
+var _ = require('lodash');
+var readlineFacade = require('readline2');
+
+
+/**
+ * Base interface class other can inherits from
+ */
+
+var UI = module.exports = function (opt) {
+  // Instantiate the Readline interface
+  // @Note: Don't reassign if already present (allow test to override the Stream)
+  if (!this.rl) {
+    this.rl = readlineFacade.createInterface(_.extend({
+      terminal: true
+    }, opt));
+  }
+  this.rl.resume();
+
+  this.onForceClose = this.onForceClose.bind(this);
+
+  // Make sure new prompt start on a newline when closing
+  this.rl.on('SIGINT', this.onForceClose);
+  process.on('exit', this.onForceClose);
+};
+
+
+/**
+ * Handle the ^C exit
+ * @return {null}
+ */
+
+UI.prototype.onForceClose = function () {
+  this.close();
+  console.log('\n'); // Line return
+};
+
+
+/**
+ * Close the interface and cleanup listeners
+ */
+
+UI.prototype.close = function () {
+  // Remove events listeners
+  this.rl.removeListener('SIGINT', this.onForceClose);
+  process.removeListener('exit', this.onForceClose);
+
+  // Restore prompt functionnalities
+  this.rl.output.unmute();
+
+  // Close the readline
+  this.rl.output.end();
+  this.rl.pause();
+  this.rl.close();
+  this.rl = null;
+};