the whole shebang

vendor/symfony/finder/Symfony/Component/Finder/Shell/Shell.php

@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Finder\Shell;
+
+/**
+ * @author Jean-François Simon <contact@jfsimon.fr>
+ */
+class Shell
+{
+    const TYPE_UNIX    = 1;
+    const TYPE_DARWIN  = 2;
+    const TYPE_CYGWIN  = 3;
+    const TYPE_WINDOWS = 4;
+    const TYPE_BSD     = 5;
+
+    /**
+     * @var string|null
+     */
+    private $type;
+
+    /**
+     * Returns guessed OS type.
+     *
+     * @return int
+     */
+    public function getType()
+    {
+        if (null === $this->type) {
+            $this->type = $this->guessType();
+        }
+
+        return $this->type;
+    }
+
+    /**
+     * Tests if a command is available.
+     *
+     * @param string $command
+     *
+     * @return bool
+     */
+    public function testCommand($command)
+    {
+        if (self::TYPE_WINDOWS === $this->type) {
+            // todo: find a way to test if windows command exists
+            return false;
+        }
+
+        if (!function_exists('exec')) {
+            return false;
+        }
+
+        // todo: find a better way (command could not be available)
+        exec('command -v '.$command, $output, $code);
+
+        return 0 === $code && count($output) > 0;
+    }
+
+    /**
+     * Guesses OS type.
+     *
+     * @return int
+     */
+    private function guessType()
+    {
+        $os = strtolower(PHP_OS);
+
+        if (false !== strpos($os, 'cygwin')) {
+            return self::TYPE_CYGWIN;
+        }
+
+        if (false !== strpos($os, 'darwin')) {
+            return self::TYPE_DARWIN;
+        }
+
+        if (false !== strpos($os, 'bsd')) {
+            return self::TYPE_BSD;
+        }
+
+        if (0 === strpos($os, 'win')) {
+            return self::TYPE_WINDOWS;
+        }
+
+        return self::TYPE_UNIX;
+    }
+}