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- 28.08.2024
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Terminal.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Console;
013
014 class Terminal
015 {
016 private static $width;
017 private static $height;
018 private static $stty;
019
020 /**
021 * Gets the terminal width.
022 *
023 * @return int
024 */
025 public function getWidth()
026 {
027 $width = getenv('COLUMNS');
028 if (false !== $width) {
029 return (int) trim($width);
030 }
031
032 if (null === self::$width) {
033 self::initDimensions();
034 }
035
036 return self::$width ?: 80;
037 }
038
039 /**
040 * Gets the terminal height.
041 *
042 * @return int
043 */
044 public function getHeight()
045 {
046 $height = getenv('LINES');
047 if (false !== $height) {
048 return (int) trim($height);
049 }
050
051 if (null === self::$height) {
052 self::initDimensions();
053 }
054
055 return self::$height ?: 50;
056 }
057
058 /**
059 * @internal
060 *
061 * @return bool
062 */
063 public static function hasSttyAvailable()
064 {
065 if (null !== self::$stty) {
066 return self::$stty;
067 }
068
069 // skip check if exec function is disabled
070 if (!\function_exists('exec')) {
071 return false;
072 }
073
074 exec('stty 2>&1', $output, $exitcode);
075
076 return self::$stty = 0 === $exitcode;
077 }
078
079 private static function initDimensions()
080 {
081 if ('\\' === \DIRECTORY_SEPARATOR) {
082 if (preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim(getenv('ANSICON')), $matches)) {
083 // extract [w, H] from "wxh (WxH)"
084 // or [w, h] from "wxh"
085 self::$width = (int) $matches[1];
086 self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
087 } elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
088 // only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
089 // testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
090 self::initDimensionsUsingStty();
091 } elseif (null !== $dimensions = self::getConsoleMode()) {
092 // extract [w, h] from "wxh"
093 self::$width = (int) $dimensions[0];
094 self::$height = (int) $dimensions[1];
095 }
096 } else {
097 self::initDimensionsUsingStty();
098 }
099 }
100
101 /**
102 * Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
103 */
104 private static function hasVt100Support()
105 {
106 return \function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support(fopen('php://stdout', 'w'));
107 }
108
109 /**
110 * Initializes dimensions using the output of an stty columns line.
111 */
112 private static function initDimensionsUsingStty()
113 {
114 if ($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