<?php
/**
* Command class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\console;
/**
* Command represents an executable console command.
*
* It works like {@link \yii\web\Controller} by parsing command line options and dispatching
* the request to a specific action with appropriate option values.
*
* Users call a console command via the following command format:
* <pre>
* yiic CommandName ActionName --Option1=Value1 --Option2=Value2 ...
* </pre>
*
* Child classes mainly needs to implement various action methods whose name must be
* prefixed with "action". The parameters to an action method are considered as options
* for that specific action. The action specified as {@link defaultAction} will be invoked
* when a user does not specify the action name in his command.
*
* Options are bound to action parameters via parameter names. For example, the following
* action method will allow us to run a command with <code>yiic sitemap --type=News</code>:
* <pre>
* class SitemapCommand {
* public function actionIndex($type) {
* ....
* }
* }
* </pre>
*
* @property string $name The command name.
* @property CommandRunner $commandRunner The command runner instance.
* @property string $help The command description. Defaults to 'Usage: php entry-script.php command-name'.
* @property array $optionHelp The command option help information. Each array element describes
* the help information for a single action.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
abstract class Command extends \yii\base\Component
{
/**
* @var string the name of the default action. Defaults to 'index'.
*/
public $defaultAction='index';
private $_name;
private $_runner;
/**
* Constructor.
* @param string $name name of the command
* @param CConsoleCommandRunner $runner the command runner
*/
public function __construct($name,$runner)
{
$this->_name=$name;
$this->_runner=$runner;
}
/**
* Initializes the command object.
* This method is invoked after a command object is created and initialized with configurations.
* You may override this method to further customize the command before it executes.
*/
public function init()
{
}
/**
* Executes the command.
* The default implementation will parse the input parameters and
* dispatch the command request to an appropriate action with the corresponding
* option values
* @param array $args command line parameters for this command.
*/
public function run($args)
{
list($action, $options, $args)=$this->resolveRequest($args);
$methodName='action'.$action;
if(!preg_match('/^\w+$/',$action) || !method_exists($this,$methodName))
$this->usageError("Unknown action: ".$action);
$method=new \ReflectionMethod($this,$methodName);
$params=array();
// named and unnamed options
foreach($method->getParameters() as $param)
{
$name=$param->getName();
if(isset($options[$name]))
{
if($param->isArray())
$params[]=is_array($options[$name]) ? $options[$name] : array($options[$name]);
else if(!is_array($options[$name]))
$params[]=$options[$name];
else
$this->usageError("Option --$name requires a scalar. Array is given.");
} else if($name==='args')
$params[]=$args;
else if($param->isDefaultValueAvailable())
$params[]=$param->getDefaultValue();
else
$this->usageError("Missing required option --$name.");
unset($options[$name]);
}
// try global options
if(!empty($options))
{
$class=new \ReflectionClass(get_class($this));
foreach($options as $name=>$value)
{
if($class->hasProperty($name))
{
$property=$class->getProperty($name);
if($property->isPublic() && !$property->isStatic())
{
$this->$name=$value;
unset($options[$name]);
}
}
}
}
if(!empty($options))
$this->usageError("Unknown options: ".implode(', ',array_keys($options)));
if($this->beforeAction($action,$params))
{
$method->invokeArgs($this,$params);
$this->afterAction($action,$params);
}
}
/**
* This method is invoked right before an action is to be executed.
* You may override this method to do last-minute preparation for the action.
* @param string $action the action name
* @param array $params the parameters to be passed to the action method.
* @return boolean whether the action should be executed.
*/
protected function beforeAction($action,$params)
{
return true;
}
/**
* This method is invoked right after an action finishes execution.
* You may override this method to do some postprocessing for the action.
* @param string $action the action name
* @param array $params the parameters to be passed to the action method.
*/
protected function afterAction($action,$params)
{
}
/**
* Parses the command line arguments and determines which action to perform.
* @param array $args command line arguments
* @return array the action name, named options (name=>value), and unnamed options
*/
protected function resolveRequest($args)
{
$options=array(); // named parameters
$params=array(); // unnamed parameters
foreach($args as $arg)
{
if(preg_match('/^--(\w+)(=(.*))?$/',$arg,$matches)) // an option
{
$name=$matches[1];
$value=isset($matches[3]) ? $matches[3] : true;
if(isset($options[$name]))
{
if(!is_array($options[$name]))
$options[$name]=array($options[$name]);
$options[$name][]=$value;
} else
$options[$name]=$value;
} else if(isset($action))
$params[]=$arg;
else
$action=$arg;
}
if(!isset($action))
$action=$this->defaultAction;
return array($action,$options,$params);
}
/**
* @return string the command name.
*/
public function getName()
{
return $this->_name;
}
/**
* @return \yii\console\CommandRunner the command runner instance
*/
public function getCommandRunner()
{
return $this->_runner;
}
/**
* Provides the command description.
* This method may be overridden to return the actual command description.
* @return string the command description. Defaults to 'Usage: php entry-script.php command-name'.
*/
public function getHelp()
{
$help='Usage: '.$this->getCommandRunner()->getScriptName().' '.$this->getName();
$options=$this->getOptionHelp();
if(empty($options))
return $help;
if(count($options)===1)
return $help.' '.$options[0];
$help.=" <action>\nActions:\n";
foreach($options as $option)
$help.=' '.$option."\n";
return $help;
}
/**
* Provides the command option help information.
* The default implementation will return all available actions together with their
* corresponding option information.
* @return array the command option help information. Each array element describes
* the help information for a single action.
*/
public function getOptionHelp()
{
$options=array();
$class=new \ReflectionClass(get_class($this));
foreach($class->getMethods(\ReflectionMethod::IS_PUBLIC) as $method)
{
$name=$method->getName();
if(!strncasecmp($name,'action',6) && strlen($name)>6)
{
$name=substr($name,6);
$name[0]=strtolower($name[0]);
$help=$name;
foreach($method->getParameters() as $param)
{
$optional=$param->isDefaultValueAvailable();
$defaultValue=$optional ? $param->getDefaultValue() : null;
$name=$param->getName();
if($optional)
$help.=" [--$name=$defaultValue]";
else
$help.=" --$name=value";
}
$options[]=$help;
}
}
return $options;
}
/**
* Displays a usage error.
* This method will then terminate the execution of the current application.
* @param string $message the error message
*/
public function usageError($message)
{
echo "Error: $message\n\n".$this->getHelp()."\n";
exit(1);
}
/**
* Renders a view file.
* @param string $_viewFile_ view file path
* @param array $_data_ optional data to be extracted as local view variables
* @param boolean $_return_ whether to return the rendering result instead of displaying it
* @return mixed the rendering result if required. Null otherwise.
*/
public function renderFile($_viewFile_,$_data_=null,$_return_=false)
{
if(is_array($_data_))
extract($_data_,EXTR_PREFIX_SAME,'data');
else
$data=$_data_;
if($_return_)
{
ob_start();
ob_implicit_flush(false);
require($_viewFile_);
return ob_get_clean();
} else
require($_viewFile_);
}
/**
* Reads input via the readline PHP extension if that's available, or fgets() if readline is not installed.
*
* @param string $message to echo out before waiting for user input
* @return mixed line read as a string, or false if input has been closed
*/
public function prompt($message)
{
if(extension_loaded('readline'))
{
$input = readline($message.' ');
readline_add_history($input);
return $input;
} else
{
echo $message.' ';
return trim(fgets(STDIN));
}
}
/**
* Asks user to confirm by typing y or n.
*
* @param string $message to echo out before waiting for user input
* @return bool if user confirmed
*/
public function confirm($message)
{
echo $message.' [yes|no] ';
return !strncasecmp(trim(fgets(STDIN)),'y',1);
}
}