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<?php
require_once(dirname(__FILE__)."/Extensions.php"); /* for the PHP_Shell_Interface */
/**
*
*/
class PHP_Shell_Options implements PHP_Shell_Extension {
/*
* instance of the current class
*
* @var PHP_Shell_Options
*/
static protected $instance;
/**
* known options and their setors
*
* @var array
* @see registerOption
*/
protected $options = array();
/**
* known options and their setors
*
* @var array
* @see registerOptionAlias
*/
protected $option_aliases = array();
public function register() {
$cmd = PHP_Shell_Commands::getInstance();
$cmd->registerCommand('#^:set #', $this, 'cmdSet', ':set <var>', 'set a shell variable');
}
/**
* register a option
*
* @param string name of the option
* @param object a object handle
* @param string method-name of the setor in the object
* @param string (unused)
*/
public function registerOption($option, $obj, $setor, $getor = null) {
if (!method_exists($obj, $setor)) {
throw new Exception(sprintf("setor %s doesn't exist on class %s", $setor, get_class($obj)));
}
$this->options[trim($option)] = array("obj" => $obj, "setor" => $setor);
}
/**
* set a shell-var
*
* :set al to enable autoload
* :set bg=dark to enable highlighting with a dark backgroud
*/
public function cmdSet($l) {
if (!preg_match('#:set\s+([a-z]+)\s*(?:=\s*([a-z0-9]+)\s*)?$#i', $l, $a)) {
print(':set failed: either :set <option> or :set <option> = <value>');
return;
}
$this->execute($a[1], isset($a[2]) ? $a[2] : null);
}
/**
* get all the option names
*
* @return array names of all options
*/
public function getOptions() {
return array_keys($this->options);
}
/**
* map a option to another option
*
* e.g.: bg maps to background
*
* @param string alias
* @param string option
*/
public function registerOptionAlias($alias, $option) {
if (!isset($this->options[$option])) {
throw new Exception(sprintf("Option %s is not known", $option));
}
$this->option_aliases[trim($alias)] = trim($option);
}
/**
* execute a :set command
*
* calls the setor for the :set <option>
*
*
*/
private function execute($key, $value) {
/* did we hit a alias (bg for backgroud) ? */
if (isset($this->option_aliases[$key])) {
$opt_key = $this->option_aliases[$key];
} else {
$opt_key = $key;
}
if (!isset($this->options[$opt_key])) {
print (':set '.$key.' failed: unknown key');
return;
}
if (!isset($this->options[$opt_key]["setor"])) {
return;
}
$setor = $this->options[$opt_key]["setor"];
$obj = $this->options[$opt_key]["obj"];
$obj->$setor($key, $value);
}
static function getInstance() {
if (is_null(self::$instance)) {
$class = __CLASS__;
self::$instance = new $class();
}
return self::$instance;
}
}
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