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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

 * @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: 1.10.1

 * @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

     */

    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()

    public static 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

     */

    public 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

     */

    public 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

     */

    public 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

     */

    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

     */

    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

     */

    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

     */

    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

     */

    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

     */

    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;

    }

    // }}}

}