depicter / vendor / symfony / console / Terminal.php

Terminal.php in Depicter — Popup & Slider Builder trunk, at vendor/symfony/console/Terminal.php

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1	<?php
2
3	/*
4	* This file is part of the Symfony package.
5	*
6	* (c) Fabien Potencier <[email protected]>
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\Console;
13
14	class Terminal
15	{
16	private static $width;
17	private static $height;
18	private static $stty;
19
20	/**
21	* Gets the terminal width.
22	*
23	* @return int
24	*/
25	public function getWidth()
26	{
27	$width = getenv('COLUMNS');
28	if (false !== $width) {
29	return (int) trim($width);
30	}
31
32	if (null === self::$width) {
33	self::initDimensions();
34	}
35
36	return self::$width ?: 80;
37	}
38
39	/**
40	* Gets the terminal height.
41	*
42	* @return int
43	*/
44	public function getHeight()
45	{
46	$height = getenv('LINES');
47	if (false !== $height) {
48	return (int) trim($height);
49	}
50
51	if (null === self::$height) {
52	self::initDimensions();
53	}
54
55	return self::$height ?: 50;
56	}
57
58	/**
59	* @internal
60	*/
61	public static function hasSttyAvailable(): bool
62	{
63	if (null !== self::$stty) {
64	return self::$stty;
65	}
66
67	// skip check if shell_exec function is disabled
68	if (!\function_exists('shell_exec')) {
69	return false;
70	}
71
72	return self::$stty = (bool) shell_exec('stty 2> '.('\\' === \DIRECTORY_SEPARATOR ? 'NUL' : '/dev/null'));
73	}
74
75	private static function initDimensions()
76	{
77	if ('\\' === \DIRECTORY_SEPARATOR) {
78	$ansicon = getenv('ANSICON');
79	if (false !== $ansicon && preg_match('/^(\d+)x(\d+)(?: $(\d+)x(\d+)$)?$/', trim($ansicon), $matches)) {
80	// extract [w, H] from "wxh (WxH)"
81	// or [w, h] from "wxh"
82	self::$width = (int) $matches[1];
83	self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
84	} elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
85	// only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
86	// testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
87	self::initDimensionsUsingStty();
88	} elseif (null !== $dimensions = self::getConsoleMode()) {
89	// extract [w, h] from "wxh"
90	self::$width = (int) $dimensions[0];
91	self::$height = (int) $dimensions[1];
92	}
93	} else {
94	self::initDimensionsUsingStty();
95	}
96	}
97
98	/**
99	* Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
100	*/
101	private static function hasVt100Support(): bool
102	{
103	return \function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support(fopen('php://stdout', 'w'));
104	}
105
106	/**
107	* Initializes dimensions using the output of an stty columns line.
108	*/
109	private static function initDimensionsUsingStty()
110	{
111	if ($sttyString = self::getSttyColumns()) {
112	if (preg_match('/rows.(\d+);.columns.(\d+);/i', $sttyString, $matches)) {
113	// extract [w, h] from "rows h; columns w;"
114	self::$width = (int) $matches[2];
115	self::$height = (int) $matches[1];
116	} elseif (preg_match('/;.(\d+).rows;.(\d+).columns/i', $sttyString, $matches)) {
117	// extract [w, h] from "; h rows; w columns"
118	self::$width = (int) $matches[2];
119	self::$height = (int) $matches[1];
120	}
121	}
122	}
123
124	/**
125	* Runs and parses mode CON if it's available, suppressing any error output.
126	*
127	* @return int[]\|null An array composed of the width and the height or null if it could not be parsed
128	*/
129	private static function getConsoleMode(): ?array
130	{
131	$info = self::readFromProcess('mode CON');
132
133	if (null === $info \|\| !preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
134	return null;
135	}
136
137	return [(int) $matches[2], (int) $matches[1]];
138	}
139
140	/**
141	* Runs and parses stty -a if it's available, suppressing any error output.
142	*/
143	private static function getSttyColumns(): ?string
144	{
145	return self::readFromProcess('stty -a \| grep columns');
146	}
147
148	private static function readFromProcess(string $command): ?string
149	{
150	if (!\function_exists('proc_open')) {
151	return null;
152	}
153
154	$descriptorspec = [
155	1 => ['pipe', 'w'],
156	2 => ['pipe', 'w'],
157	];
158
159	$cp = \function_exists('sapi_windows_cp_set') ? sapi_windows_cp_get() : 0;
160
161	if (!$process = @proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true])) {
162	return null;
163	}
164
165	$info = stream_get_contents($pipes[1]);
166	fclose($pipes[1]);
167	fclose($pipes[2]);
168	proc_close($process);
169
170	if ($cp) {
171	sapi_windows_cp_set($cp);
172	}
173
174	return $info;
175	}
176	}
177