CConsoleCommandRunner

public function addCommands($path)
{
    if(($commands=$this->findCommands($path))!==array())
    {
        foreach($commands as $name=>$file)
        {
            if(!isset($this->commands[$name]))
                $this->commands[$name]=$file;
        }
    }
}

public function createCommand($name)
{
    $name=strtolower($name);

    $command=null;
    if(isset($this->commands[$name]))
        $command=$this->commands[$name];
    else
    {
        $commands=array_change_key_case($this->commands);
        if(isset($commands[$name]))
            $command=$commands[$name];
    }

    if($command!==null)
    {
        if(is_string($command)) // class file path or alias
        {
            if(strpos($command,'/')!==false || strpos($command,'\\')!==false)
            {
                $className=substr(basename($command),0,-4);
                if(!class_exists($className,false))
                    require_once($command);
            }
            else // an alias
                $className=Yii::import($command);
            return new $className($name,$this);
        }
        else // an array configuration
            return Yii::createComponent($command,$name,$this);
    }
    elseif($name==='help')
        return new CHelpCommand('help',$this);
    else
        return null;
}

public function findCommands($path)
{
    if(($dir=@opendir($path))===false)
        return array();
    $commands=array();
    while(($name=readdir($dir))!==false)
    {
        $file=$path.DIRECTORY_SEPARATOR.$name;
        if(!strcasecmp(substr($name,-11),'Command.php') && is_file($file))
            $commands[strtolower(substr($name,0,-11))]=$file;
    }
    closedir($dir);
    return $commands;
}

public function getCommand()
{
    return $this->_command;
}

public function getScriptName()
{
    return $this->_scriptName;
}

public function run($args)
{
    $this->_scriptName=$args[0];
    array_shift($args);
    if(isset($args[0]))
    {
        $name=$args[0];
        array_shift($args);
    }
    else
        $name='help';

    $oldCommand=$this->_command;
    if(($command=$this->createCommand($name))===null)
        $command=$this->createCommand('help');
    $this->_command=$command;
    $command->init();
    $exitCode=$command->run($args);
    $this->_command=$oldCommand;
    return $exitCode;
}

public function setCommand($value)
{
    $this->_command=$value;
}