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Terminal.php

151 lines

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	namespace IAWP_SCOPED\Symfony\Component\Console;
12
13	class Terminal
14	{
15	private static $width;
16	private static $height;
17	private static $stty;
18	/**
19	* Gets the terminal width.
20	*
21	* @return int
22	*/
23	public function getWidth()
24	{
25	$width = \getenv('COLUMNS');
26	if (\false !== $width) {
27	return (int) \trim($width);
28	}
29	if (null === self::$width) {
30	self::initDimensions();
31	}
32	return self::$width ?: 80;
33	}
34	/**
35	* Gets the terminal height.
36	*
37	* @return int
38	*/
39	public function getHeight()
40	{
41	$height = \getenv('LINES');
42	if (\false !== $height) {
43	return (int) \trim($height);
44	}
45	if (null === self::$height) {
46	self::initDimensions();
47	}
48	return self::$height ?: 50;
49	}
50	/**
51	* @internal
52	*/
53	public static function hasSttyAvailable() : bool
54	{
55	if (null !== self::$stty) {
56	return self::$stty;
57	}
58	// skip check if shell_exec function is disabled
59	if (!\function_exists('shell_exec')) {
60	return \false;
61	}
62	return self::$stty = (bool) \shell_exec('stty 2> ' . ('\\' === \DIRECTORY_SEPARATOR ? 'NUL' : '/dev/null'));
63	}
64	private static function initDimensions()
65	{
66	if ('\\' === \DIRECTORY_SEPARATOR) {
67	$ansicon = \getenv('ANSICON');
68	if (\false !== $ansicon && \preg_match('/^(\\d+)x(\\d+)(?: \$(\\d+)x(\\d+)\$)?$/', \trim($ansicon), $matches)) {
69	// extract [w, H] from "wxh (WxH)"
70	// or [w, h] from "wxh"
71	self::$width = (int) $matches[1];
72	self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
73	} elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
74	// only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
75	// testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
76	self::initDimensionsUsingStty();
77	} elseif (null !== ($dimensions = self::getConsoleMode())) {
78	// extract [w, h] from "wxh"
79	self::$width = (int) $dimensions[0];
80	self::$height = (int) $dimensions[1];
81	}
82	} else {
83	self::initDimensionsUsingStty();
84	}
85	}
86	/**
87	* Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
88	*/
89	private static function hasVt100Support() : bool
90	{
91	return \function_exists('sapi_windows_vt100_support') && \sapi_windows_vt100_support(\fopen('php://stdout', 'w'));
92	}
93	/**
94	* Initializes dimensions using the output of an stty columns line.
95	*/
96	private static function initDimensionsUsingStty()
97	{
98	if ($sttyString = self::getSttyColumns()) {
99	if (\preg_match('/rows.(\\d+);.columns.(\\d+);/i', $sttyString, $matches)) {
100	// extract [w, h] from "rows h; columns w;"
101	self::$width = (int) $matches[2];
102	self::$height = (int) $matches[1];
103	} elseif (\preg_match('/;.(\\d+).rows;.(\\d+).columns/i', $sttyString, $matches)) {
104	// extract [w, h] from "; h rows; w columns"
105	self::$width = (int) $matches[2];
106	self::$height = (int) $matches[1];
107	}
108	}
109	}
110	/**
111	* Runs and parses mode CON if it's available, suppressing any error output.
112	*
113	* @return int[]\|null An array composed of the width and the height or null if it could not be parsed
114	*/
115	private static function getConsoleMode() : ?array
116	{
117	$info = self::readFromProcess('mode CON');
118	if (null === $info \|\| !\preg_match('/--------+\\r?\\n.+?(\\d+)\\r?\\n.+?(\\d+)\\r?\\n/', $info, $matches)) {
119	return null;
120	}
121	return [(int) $matches[2], (int) $matches[1]];
122	}
123	/**
124	* Runs and parses stty -a if it's available, suppressing any error output.
125	*/
126	private static function getSttyColumns() : ?string
127	{
128	return self::readFromProcess('stty -a \| grep columns');
129	}
130	private static function readFromProcess(string $command) : ?string
131	{
132	if (!\function_exists('proc_open')) {
133	return null;
134	}
135	$descriptorspec = [1 => ['pipe', 'w'], 2 => ['pipe', 'w']];
136	$cp = \function_exists('sapi_windows_cp_set') ? \sapi_windows_cp_get() : 0;
137	$process = \proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => \true]);
138	if (!\is_resource($process)) {
139	return null;
140	}
141	$info = \stream_get_contents($pipes[1]);
142	\fclose($pipes[1]);
143	\fclose($pipes[2]);
144	\proc_close($process);
145	if ($cp) {
146	\sapi_windows_cp_set($cp);
147	}
148	return $info;
149	}
150	}
151