Issue #51

Possibility of custom commands.

Mage/Autoload.php

@@ -31,6 +31,11 @@ class Autoload
         if (strpos($className, 'Task\\') === 0) {
             $baseDir = getcwd() . '/.mage/tasks';
             $postfix = substr($postfix, 5);
+
+        } else if (strpos($className, 'Command\\') === 0) {
+            $baseDir = getcwd() . '/.mage/commands';
+            $postfix = substr($postfix, 8);
+
         } else {
             $baseDir = dirname(dirname(__FILE__));
         }

Mage/Command/Factory.php

@@ -10,6 +10,7 @@
 
 namespace Mage\Command;
 
+use Mage\Command\AbstractCommand;
 use Mage\Config;
 use Mage\Autoload;
 
@@ -39,13 +40,18 @@ class Factory
         $commandName = str_replace(' ', '_', ucwords(str_replace('/', ' ', $commandName)));
         $className = 'Mage\\Command\\BuiltIn\\' . $commandName . 'Command';
 
+        if (!class_exists($className)) {
+            // try a custom command
+            $className = 'Command\\' . $commandName;
+
             if (!class_exists($className)) {
                 throw new Exception('Command "' . $commandName . '" not found.');
             }
+        }
 
         /** @var AbstractCommand $instance */
         $instance = new $className;
-        if (!is_a($instance, "Mage\Command\AbstractCommand")) {
+        if (! $instance instanceOf AbstractCommand) {
             throw new Exception('The command ' . $commandName . ' must be an instance of Mage\Command\AbstractCommand.');
         }