add command line history and navigation to the console

lib/monitor.js

@@ -3,14 +3,37 @@
 
 var blessed = require("blessed");
 
-//var formatOutput = require("../utils/format-output.js");
+var CommandHistory = function() {
-//var formatModules = require("../utils/format-modules.js");
+  this.history = [];
-//var formatAssets = require("../utils/format-assets.js");
+  this.pointer = -1;
+};
+
+CommandHistory.prototype.addCommand = function(cmd) {
+  this.history.push(cmd);
+  this.pointer = this.history.length;
+};
+
+CommandHistory.prototype.getPreviousCommand = function(cmd) {
+  if (this.pointer >= 0) {
+    this.pointer--;
+  }
+  return this.history[this.pointer];
+};
+
+CommandHistory.prototype.getNextCommand = function(cmd) {
+  if (this.pointer >= this.history.length) {
+    this.pointer = this.history.length - 1;
+    return '';
+  }
+  this.pointer++;
+  return this.history[this.pointer];
+};
 
 function Dashboard(options) {
   var title = options && options.title || "Embark 2.0";
   this.env = options.env;
   this.console = options.console;
+  this.history = new CommandHistory();
 
   this.color = options && options.color || "green";
   this.minimal = options && options.minimal || false;
@@ -316,8 +339,21 @@ Dashboard.prototype.layoutCmd = function() {
     process.exit(0);
   });
 
+  this.input.key(["up"], function() {
+    var cmd = self.history.getPreviousCommand();
+    self.input.setValue(cmd);
+    self.input.focus();
+  });
+
+  this.input.key(["down"], function() {
+    var cmd = self.history.getNextCommand();
+    self.input.setValue(cmd);
+    self.input.focus();
+  });
+
   this.input.on('submit', function(data) {
     if (data !== '') {
+      self.history.addCommand(data);
       self.logText.log('console> ' + data);
       self.console.executeCmd(data, function(result) {
         self.logText.log(result);