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Terminal.php

152 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	/** @internal */
14	class Terminal
15	{
16	private static $width;
17	private static $height;
18	private static $stty;
19	/**
20	* Gets the terminal width.
21	*
22	* @return int
23	*/
24	public function getWidth()
25	{
26	$width = \getenv('COLUMNS');
27	if (\false !== $width) {
28	return (int) \trim($width);
29	}
30	if (null === self::$width) {
31	self::initDimensions();
32	}
33	return self::$width ?: 80;
34	}
35	/**
36	* Gets the terminal height.
37	*
38	* @return int
39	*/
40	public function getHeight()
41	{
42	$height = \getenv('LINES');
43	if (\false !== $height) {
44	return (int) \trim($height);
45	}
46	if (null === self::$height) {
47	self::initDimensions();
48	}
49	return self::$height ?: 50;
50	}
51	/**
52	* @internal
53	*/
54	public static function hasSttyAvailable() : bool
55	{
56	if (null !== self::$stty) {
57	return self::$stty;
58	}
59	// skip check if shell_exec function is disabled
60	if (!\function_exists('shell_exec')) {
61	return \false;
62	}
63	return self::$stty = (bool) \shell_exec('stty 2> ' . ('\\' === \DIRECTORY_SEPARATOR ? 'NUL' : '/dev/null'));
64	}
65	private static function initDimensions()
66	{
67	if ('\\' === \DIRECTORY_SEPARATOR) {
68	$ansicon = \getenv('ANSICON');
69	if (\false !== $ansicon && \preg_match('/^(\\d+)x(\\d+)(?: \$(\\d+)x(\\d+)\$)?$/', \trim($ansicon), $matches)) {
70	// extract [w, H] from "wxh (WxH)"
71	// or [w, h] from "wxh"
72	self::$width = (int) $matches[1];
73	self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
74	} elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
75	// only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
76	// testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
77	self::initDimensionsUsingStty();
78	} elseif (null !== ($dimensions = self::getConsoleMode())) {
79	// extract [w, h] from "wxh"
80	self::$width = (int) $dimensions[0];
81	self::$height = (int) $dimensions[1];
82	}
83	} else {
84	self::initDimensionsUsingStty();
85	}
86	}
87	/**
88	* Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
89	*/
90	private static function hasVt100Support() : bool
91	{
92	return \function_exists('sapi_windows_vt100_support') && \sapi_windows_vt100_support(\fopen('php://stdout', 'w'));
93	}
94	/**
95	* Initializes dimensions using the output of an stty columns line.
96	*/
97	private static function initDimensionsUsingStty()
98	{
99	if ($sttyString = self::getSttyColumns()) {
100	if (\preg_match('/rows.(\\d+);.columns.(\\d+);/i', $sttyString, $matches)) {
101	// extract [w, h] from "rows h; columns w;"
102	self::$width = (int) $matches[2];
103	self::$height = (int) $matches[1];
104	} elseif (\preg_match('/;.(\\d+).rows;.(\\d+).columns/i', $sttyString, $matches)) {
105	// extract [w, h] from "; h rows; w columns"
106	self::$width = (int) $matches[2];
107	self::$height = (int) $matches[1];
108	}
109	}
110	}
111	/**
112	* Runs and parses mode CON if it's available, suppressing any error output.
113	*
114	* @return int[]\|null An array composed of the width and the height or null if it could not be parsed
115	*/
116	private static function getConsoleMode() : ?array
117	{
118	$info = self::readFromProcess('mode CON');
119	if (null === $info \|\| !\preg_match('/--------+\\r?\\n.+?(\\d+)\\r?\\n.+?(\\d+)\\r?\\n/', $info, $matches)) {
120	return null;
121	}
122	return [(int) $matches[2], (int) $matches[1]];
123	}
124	/**
125	* Runs and parses stty -a if it's available, suppressing any error output.
126	*/
127	private static function getSttyColumns() : ?string
128	{
129	return self::readFromProcess('stty -a \| grep columns');
130	}
131	private static function readFromProcess(string $command) : ?string
132	{
133	if (!\function_exists('proc_open')) {
134	return null;
135	}
136	$descriptorspec = [1 => ['pipe', 'w'], 2 => ['pipe', 'w']];
137	$cp = \function_exists('sapi_windows_cp_set') ? \sapi_windows_cp_get() : 0;
138	$process = \proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => \true]);
139	if (!\is_resource($process)) {
140	return null;
141	}
142	$info = \stream_get_contents($pipes[1]);
143	\fclose($pipes[1]);
144	\fclose($pipes[2]);
145	\proc_close($process);
146	if ($cp) {
147	\sapi_windows_cp_set($cp);
148	}
149	return $info;
150	}
151	}
152