1: <?php
 2: 
 3: /*
 4:  * This file is part of the Symfony package.
 5:  *
 6:  * (c) Fabien Potencier <fabien@symfony.com>
 7:  *
 8:  * For the full copyright and license information, please view the LICENSE
 9:  * file that was distributed with this source code.
10:  */
11: 
12: namespace Symfony\Component\Finder\Shell;
13: 
14: /**
15:  * @author Jean-François Simon <contact@jfsimon.fr>
16:  */
17: class Shell
18: {
19:     const TYPE_UNIX    = 1;
20:     const TYPE_DARWIN  = 2;
21:     const TYPE_CYGWIN  = 3;
22:     const TYPE_WINDOWS = 4;
23:     const TYPE_BSD     = 5;
24: 
25:     /**
26:      * @var string|null
27:      */
28:     private $type;
29: 
30:     /**
31:      * Returns guessed OS type.
32:      *
33:      * @return int
34:      */
35:     public function getType()
36:     {
37:         if (null === $this->type) {
38:             $this->type = $this->guessType();
39:         }
40: 
41:         return $this->type;
42:     }
43: 
44:     /**
45:      * Tests if a command is available.
46:      *
47:      * @param string $command
48:      *
49:      * @return bool
50:      */
51:     public function testCommand($command)
52:     {
53:         if (self::TYPE_WINDOWS === $this->type) {
54:             // todo: find a way to test if windows command exists
55:             return false;
56:         }
57: 
58:         if (!function_exists('exec')) {
59:             return false;
60:         }
61: 
62:         // todo: find a better way (command could not be available)
63:         exec('command -v '.$command, $output, $code);
64: 
65:         return 0 === $code && count($output) > 0;
66:     }
67: 
68:     /**
69:      * Guesses OS type.
70:      *
71:      * @return int
72:      */
73:     private function guessType()
74:     {
75:         $os = strtolower(PHP_OS);
76: 
77:         if (false !== strpos($os, 'cygwin')) {
78:             return self::TYPE_CYGWIN;
79:         }
80: 
81:         if (false !== strpos($os, 'darwin')) {
82:             return self::TYPE_DARWIN;
83:         }
84: 
85:         if (false !== strpos($os, 'bsd')) {
86:             return self::TYPE_BSD;
87:         }
88: 
89:         if (0 === strpos($os, 'win')) {
90:             return self::TYPE_WINDOWS;
91:         }
92: 
93:         return self::TYPE_UNIX;
94:     }
95: }
96: