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<?php
/**
* PEAR_Command, command pattern class
*
* PHP versions 4 and 5
*
* @category pear
* @package PEAR
* @author Stig Bakken <ssb@php.net>
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @version CVS: $Id: Command.php 286494 2009-07-29 06:57:11Z dufuz $
* @link http://pear.php.net/package/PEAR
* @since File available since Release 0.1
*/
/**
* Needed for error handling
*/
require_once 'PEAR.php';
require_once 'PEAR/Frontend.php';
require_once 'PEAR/XMLParser.php';
/**
* List of commands and what classes they are implemented in.
* @var array command => implementing class
*/
$GLOBALS['_PEAR_Command_commandlist'] = array();
/**
* List of commands and their descriptions
* @var array command => description
*/
$GLOBALS['_PEAR_Command_commanddesc'] = array();
/**
* List of shortcuts to common commands.
* @var array shortcut => command
*/
$GLOBALS['_PEAR_Command_shortcuts'] = array();
/**
* Array of command objects
* @var array class => object
*/
$GLOBALS['_PEAR_Command_objects'] = array();
/**
* PEAR command class, a simple factory class for administrative
* commands.
*
* How to implement command classes:
*
* - The class must be called PEAR_Command_Nnn, installed in the
* "PEAR/Common" subdir, with a method called getCommands() that
* returns an array of the commands implemented by the class (see
* PEAR/Command/Install.php for an example).
*
* - The class must implement a run() function that is called with three
* params:
*
* (string) command name
* (array) assoc array with options, freely defined by each
* command, for example:
* array('force' => true)
* (array) list of the other parameters
*
* The run() function returns a PEAR_CommandResponse object. Use
* these methods to get information:
*
* int getStatus() Returns PEAR_COMMAND_(SUCCESS|FAILURE|PARTIAL)
* *_PARTIAL means that you need to issue at least
* one more command to complete the operation
* (used for example for validation steps).
*
* string getMessage() Returns a message for the user. Remember,
* no HTML or other interface-specific markup.
*
* If something unexpected happens, run() returns a PEAR error.
*
* - DON'T OUTPUT ANYTHING! Return text for output instead.
*
* - DON'T USE HTML! The text you return will be used from both Gtk,
* web and command-line interfaces, so for now, keep everything to
* plain text.
*
* - DON'T USE EXIT OR DIE! Always use pear errors. From static
* classes do PEAR::raiseError(), from other classes do
* $this->raiseError().
* @category pear
* @package PEAR
* @author Stig Bakken <ssb@php.net>
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @version Release: 1.9.0
* @link http://pear.php.net/package/PEAR
* @since Class available since Release 0.1
*/
class PEAR_Command
{
// {{{ factory()
/**
* Get the right object for executing a command.
*
* @param string $command The name of the command
* @param object $config Instance of PEAR_Config object
*
* @return object the command object or a PEAR error
*
* @access public
* @static
*/
function &factory($command, &$config)
{
if (empty($GLOBALS['_PEAR_Command_commandlist'])) {
PEAR_Command::registerCommands();
}
if (isset($GLOBALS['_PEAR_Command_shortcuts'][$command])) {
$command = $GLOBALS['_PEAR_Command_shortcuts'][$command];
}
if (!isset($GLOBALS['_PEAR_Command_commandlist'][$command])) {
$a = PEAR::raiseError("unknown command `$command'");
return $a;
}
$class = $GLOBALS['_PEAR_Command_commandlist'][$command];
if (!class_exists($class)) {
require_once $GLOBALS['_PEAR_Command_objects'][$class];
}
if (!class_exists($class)) {
$a = PEAR::raiseError("unknown command `$command'");
return $a;
}
$ui =& PEAR_Command::getFrontendObject();
$obj = &new $class($ui, $config);
return $obj;
}
// }}}
// {{{ & getObject()
function &getObject($command)
{
$class = $GLOBALS['_PEAR_Command_commandlist'][$command];
if (!class_exists($class)) {
require_once $GLOBALS['_PEAR_Command_objects'][$class];
}
if (!class_exists($class)) {
return PEAR::raiseError("unknown command `$command'");
}
$ui =& PEAR_Command::getFrontendObject();
$config = &PEAR_Config::singleton();
$obj = &new $class($ui, $config);
return $obj;
}
// }}}
// {{{ & getFrontendObject()
/**
* Get instance of frontend object.
*
* @return object|PEAR_Error
* @static
*/
function &getFrontendObject()
{
$a = &PEAR_Frontend::singleton();
return $a;
}
// }}}
// {{{ & setFrontendClass()
/**
* Load current frontend class.
*
* @param string $uiclass Name of class implementing the frontend
*
* @return object the frontend object, or a PEAR error
* @static
*/
function &setFrontendClass($uiclass)
{
$a = &PEAR_Frontend::setFrontendClass($uiclass);
return $a;
}
// }}}
// {{{ setFrontendType()
/**
* Set current frontend.
*
* @param string $uitype Name of the frontend type (for example "CLI")
*
* @return object the frontend object, or a PEAR error
* @static
*/
function setFrontendType($uitype)
{
$uiclass = 'PEAR_Frontend_' . $uitype;
return PEAR_Command::setFrontendClass($uiclass);
}
// }}}
// {{{ registerCommands()
/**
* Scan through the Command directory looking for classes
* and see what commands they implement.
*
* @param bool (optional) if FALSE (default), the new list of
* commands should replace the current one. If TRUE,
* new entries will be merged with old.
*
* @param string (optional) where (what directory) to look for
* classes, defaults to the Command subdirectory of
* the directory from where this file (__FILE__) is
* included.
*
* @return bool TRUE on success, a PEAR error on failure
*
* @access public
* @static
*/
function registerCommands($merge = false, $dir = null)
{
$parser = new PEAR_XMLParser;
if ($dir === null) {
$dir = dirname(__FILE__) . '/Command';
}
if (!is_dir($dir)) {
return PEAR::raiseError("registerCommands: opendir($dir) '$dir' does not exist or is not a directory");
}
$dp = @opendir($dir);
if (empty($dp)) {
return PEAR::raiseError("registerCommands: opendir($dir) failed");
}
if (!$merge) {
$GLOBALS['_PEAR_Command_commandlist'] = array();
}
while ($file = readdir($dp)) {
if ($file{0} == '.' || substr($file, -4) != '.xml') {
continue;
}
$f = substr($file, 0, -4);
$class = "PEAR_Command_" . $f;
// List of commands
if (empty($GLOBALS['_PEAR_Command_objects'][$class])) {
$GLOBALS['_PEAR_Command_objects'][$class] = "$dir/" . $f . '.php';
}
$parser->parse(file_get_contents("$dir/$file"));
$implements = $parser->getData();
foreach ($implements as $command => $desc) {
if ($command == 'attribs') {
continue;
}
if (isset($GLOBALS['_PEAR_Command_commandlist'][$command])) {
return PEAR::raiseError('Command "' . $command . '" already registered in ' .
'class "' . $GLOBALS['_PEAR_Command_commandlist'][$command] . '"');
}
$GLOBALS['_PEAR_Command_commandlist'][$command] = $class;
$GLOBALS['_PEAR_Command_commanddesc'][$command] = $desc['summary'];
if (isset($desc['shortcut'])) {
$shortcut = $desc['shortcut'];
if (isset($GLOBALS['_PEAR_Command_shortcuts'][$shortcut])) {
return PEAR::raiseError('Command shortcut "' . $shortcut . '" already ' .
'registered to command "' . $command . '" in class "' .
$GLOBALS['_PEAR_Command_commandlist'][$command] . '"');
}
$GLOBALS['_PEAR_Command_shortcuts'][$shortcut] = $command;
}
if (isset($desc['options']) && $desc['options']) {
foreach ($desc['options'] as $oname => $option) {
if (isset($option['shortopt']) && strlen($option['shortopt']) > 1) {
return PEAR::raiseError('Option "' . $oname . '" short option "' .
$option['shortopt'] . '" must be ' .
'only 1 character in Command "' . $command . '" in class "' .
$class . '"');
}
}
}
}
}
ksort($GLOBALS['_PEAR_Command_shortcuts']);
ksort($GLOBALS['_PEAR_Command_commandlist']);
@closedir($dp);
return true;
}
// }}}
// {{{ getCommands()
/**
* Get the list of currently supported commands, and what
* classes implement them.
*
* @return array command => implementing class
*
* @access public
* @static
*/
function getCommands()
{
if (empty($GLOBALS['_PEAR_Command_commandlist'])) {
PEAR_Command::registerCommands();
}
return $GLOBALS['_PEAR_Command_commandlist'];
}
// }}}
// {{{ getShortcuts()
/**
* Get the list of command shortcuts.
*
* @return array shortcut => command
*
* @access public
* @static
*/
function getShortcuts()
{
if (empty($GLOBALS['_PEAR_Command_shortcuts'])) {
PEAR_Command::registerCommands();
}
return $GLOBALS['_PEAR_Command_shortcuts'];
}
// }}}
// {{{ getGetoptArgs()
/**
* Compiles arguments for getopt.
*
* @param string $command command to get optstring for
* @param string $short_args (reference) short getopt format
* @param array $long_args (reference) long getopt format
*
* @return void
*
* @access public
* @static
*/
function getGetoptArgs($command, &$short_args, &$long_args)
{
if (empty($GLOBALS['_PEAR_Command_commandlist'])) {
PEAR_Command::registerCommands();
}
if (isset($GLOBALS['_PEAR_Command_shortcuts'][$command])) {
$command = $GLOBALS['_PEAR_Command_shortcuts'][$command];
}
if (!isset($GLOBALS['_PEAR_Command_commandlist'][$command])) {
return null;
}
$obj = &PEAR_Command::getObject($command);
return $obj->getGetoptArgs($command, $short_args, $long_args);
}
// }}}
// {{{ getDescription()
/**
* Get description for a command.
*
* @param string $command Name of the command
*
* @return string command description
*
* @access public
* @static
*/
function getDescription($command)
{
if (!isset($GLOBALS['_PEAR_Command_commanddesc'][$command])) {
return null;
}
return $GLOBALS['_PEAR_Command_commanddesc'][$command];
}
// }}}
// {{{ getHelp()
/**
* Get help for command.
*
* @param string $command Name of the command to return help for
*
* @access public
* @static
*/
function getHelp($command)
{
$cmds = PEAR_Command::getCommands();
if (isset($GLOBALS['_PEAR_Command_shortcuts'][$command])) {
$command = $GLOBALS['_PEAR_Command_shortcuts'][$command];
}
if (isset($cmds[$command])) {
$obj = &PEAR_Command::getObject($command);
return $obj->getHelp($command);
}
return false;
}
// }}}
}
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