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diff --git a/vendor/drush/drush/lib/Drush/Command/Commandfiles.php b/vendor/drush/drush/lib/Drush/Command/Commandfiles.php
new file mode 100644
index 000000000..516f71f3f
--- /dev/null
+++ b/vendor/drush/drush/lib/Drush/Command/Commandfiles.php
@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drush\Command\Commandfiles.
+ */
+
+namespace Drush\Command;
+
+/**
+ * Default commandfiles implementation.
+ *
+ * This class manages the list of commandfiles that are active
+ * in Drush for the current command invocation.
+ */
+class Commandfiles implements CommandfilesInterface {
+  protected $cache;
+  protected $deferred;
+
+  function __construct() {
+    $this->cache = array();
+    $this->deferred = array();
+  }
+
+  function get() {
+  	return $this->cache;
+  }
+
+  function deferred() {
+  	return $this->deferred;
+  }
+
+  function sort() {
+  	ksort($this->cache);
+  }
+
+  function add($commandfile) {
+	  $load_command = FALSE;
+
+	  $module = basename($commandfile);
+	  $module = preg_replace('/\.*drush[0-9]*\.inc/', '', $module);
+	  $module_versionless = preg_replace('/\.d([0-9]+)$/', '', $module);
+	  if (!isset($this->cache[$module_versionless])) {
+	    $drupal_version = '';
+	    if (preg_match('/\.d([0-9]+)$/', $module, $matches)) {
+	      $drupal_version = $matches[1];
+	    }
+	    if (empty($drupal_version)) {
+	      $load_command = TRUE;
+	    }
+	    else {
+	      if (function_exists('drush_drupal_major_version') && ($drupal_version == drush_drupal_major_version())) {
+	      	$load_command = TRUE;
+	      }
+	      else {
+		    // Signal that we should try again on
+		    // the next bootstrap phase.
+		    $this->deferred[$module] = $commandfile; 	
+	      }
+	    }
+	    if ($load_command) {
+	      $this->cache[$module_versionless] = $commandfile;
+	      require_once $commandfile;
+	      unset($this->deferred[$module]);
+	    }
+	  }
+	  return $load_command;
+  }
+}