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<?php |
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/** |
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* this file is part of magerun |
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* |
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* @author Tom Klingenberg <https://github.com/ktomk> |
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*/ |
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namespace N98\Util; |
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/** |
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* Class WindowsSystem |
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* |
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* Utility class with global static functions. |
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* |
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* @package N98\Util |
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*/ |
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final class WindowsSystem |
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{ |
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const PATH_SEPARATOR = ';'; |
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const FORBIDDEN_CHARS = '<>:"/\|?*'; |
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/** |
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* @var WindowsSystem |
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*/ |
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private static $instance; |
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/** |
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* @var array |
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*/ |
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private $exts; |
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/** |
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* an instance is bootstrapped in to prevent initialization overhead |
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* |
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* @return WindowsSystem |
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*/ |
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private static function getInstance() |
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{ |
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self::$instance || self::$instance = new WindowsSystem(); |
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return self::$instance; |
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} |
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private function __construct() |
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{ |
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} |
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/** |
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* @return array keys are uppercase extensions incl. dot |
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*/ |
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private function getExecuteableExtesions() |
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{ |
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// PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PSC1 |
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$this->exts || $this->exts = array_flip( |
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array_map('strtoupper', explode(self::PATH_SEPARATOR, getenv('PATHEXT'))) |
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); |
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return $this->exts; |
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} |
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/** |
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* a name is executable based on it's extension |
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* |
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* @param string $name |
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* |
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* @return bool |
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*/ |
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public static function isExecutableName($name) |
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{ |
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// invalid name is never executable |
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if (false !== strpbrk($name, self::FORBIDDEN_CHARS)) { |
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return false; |
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} |
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$compare = '.' . strtoupper(pathinfo($name, PATHINFO_EXTENSION)); |
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if ($compare === '.') { |
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return false; |
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} |
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$exts = self::getInstance()->getExecuteableExtesions(); |
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return isset($exts[$compare]); |
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} |
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/** |
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* a program (by it's basename) is available on system for execution |
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* |
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* @param string $program |
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* @return bool |
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*/ |
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public static function isProgramInstalled($program) |
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{ |
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// programs with an invalid name do not exist |
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if (false !== strpbrk($program, self::FORBIDDEN_CHARS)) { |
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return false; |
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} |
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$isExecutable = self::isExecutableName($program); |
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$paths = explode(self::PATH_SEPARATOR, getenv('PATH')); |
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array_unshift($paths, getcwd()); |
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$exts = self::getInstance()->getExecuteableExtesions(); |
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foreach ($paths as $path) { |
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if (!is_dir($path)) { |
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continue; |
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} |
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$file = $path . '/' . $program; |
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if ($isExecutable && is_readable($file)) { |
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return true; |
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} |
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foreach ($exts as $ext => $index) { |
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$fileEx = $file . $ext; |
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if (is_readable($fileEx)) { |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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} |
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steverobbins /
n98-magerun
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.