upstream / vendor / symfony / console / Terminal.php

Terminal.php in UpStream: a Project Management Plugin for WordPress 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 <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\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	* @return bool
62	*/
63	public static function hasSttyAvailable()
64	{
65	if (null !== self::$stty) {
66	return self::$stty;
67	}
68
69	// skip check if exec function is disabled
70	if (!\function_exists('exec')) {
71	return false;
72	}
73
74	exec('stty 2>&1', $output, $exitcode);
75
76	return self::$stty = 0 === $exitcode;
77	}
78
79	private static function initDimensions()
80	{
81	if ('\\' === \DIRECTORY_SEPARATOR) {
82	if (preg_match('/^(\d+)x(\d+)(?: $(\d+)x(\d+)$)?$/', trim(getenv('ANSICON')), $matches)) {
83	// extract [w, H] from "wxh (WxH)"
84	// or [w, h] from "wxh"
85	self::$width = (int) $matches[1];
86	self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
87	} elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
88	// only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
89	// testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
90	self::initDimensionsUsingStty();
91	} elseif (null !== $dimensions = self::getConsoleMode()) {
92	// extract [w, h] from "wxh"
93	self::$width = (int) $dimensions[0];
94	self::$height = (int) $dimensions[1];
95	}
96	} else {
97	self::initDimensionsUsingStty();
98	}
99	}
100
101	/**
102	* Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
103	*/
104	private static function hasVt100Support()
105	{
106	return \function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support(fopen('php://stdout', 'w'));
107	}
108
109	/**
110	* Initializes dimensions using the output of an stty columns line.
111	*/
112	private static function initDimensionsUsingStty()
113	{
114	if ($sttyString = self::getSttyColumns()) {
115	if (preg_match('/rows.(\d+);.columns.(\d+);/i', $sttyString, $matches)) {
116	// extract [w, h] from "rows h; columns w;"
117	self::$width = (int) $matches[2];
118	self::$height = (int) $matches[1];
119	} elseif (preg_match('/;.(\d+).rows;.(\d+).columns/i', $sttyString, $matches)) {
120	// extract [w, h] from "; h rows; w columns"
121	self::$width = (int) $matches[2];
122	self::$height = (int) $matches[1];
123	}
124	}
125	}
126
127	/**
128	* Runs and parses mode CON if it's available, suppressing any error output.
129	*
130	* @return int[]\|null An array composed of the width and the height or null if it could not be parsed
131	*/
132	private static function getConsoleMode()
133	{
134	$info = self::readFromProcess('mode CON');
135
136	if (null === $info \|\| !preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
137	return null;
138	}
139
140	return [(int) $matches[2], (int) $matches[1]];
141	}
142
143	/**
144	* Runs and parses stty -a if it's available, suppressing any error output.
145	*
146	* @return string\|null
147	*/
148	private static function getSttyColumns()
149	{
150	return self::readFromProcess('stty -a \| grep columns');
151	}
152
153	/**
154	* @param string $command
155	*
156	* @return string\|null
157	*/
158	private static function readFromProcess($command)
159	{
160	if (!\function_exists('proc_open')) {
161	return null;
162	}
163
164	$descriptorspec = [
165	1 => ['pipe', 'w'],
166	2 => ['pipe', 'w'],
167	];
168
169	$process = proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
170	if (!\is_resource($process)) {
171	return null;
172	}
173
174	$info = stream_get_contents($pipes[1]);
175	fclose($pipes[1]);
176	fclose($pipes[2]);
177	proc_close($process);
178
179	return $info;
180	}
181	}
182