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Terminal.php
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Terminal.php
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<?php
declare(strict_types=1);
/*
* This file is part of the box project.
*
* (c) Kevin Herrera <kevin@herrera.io>
* Théo Fidry <theo.fidry@gmail.com>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
namespace KevinGH\RequirementChecker;
use function exec;
use function fclose;
use function fopen;
use function function_exists;
use function getenv;
use function is_resource;
use function preg_match;
use function proc_close;
use function proc_open;
use function sapi_windows_vt100_support;
use function stream_get_contents;
use function trim;
use const DIRECTORY_SEPARATOR;
/**
* This file is copy/pasted from the Symfony project to avoid a dependency on `symfony/console` which would be too big for just using this
* class.
*
* @license MIT (c) Fabien Potencier <fabien@symfony.com>
*/
class Terminal
{
private static $width;
private static $height;
private static $stty;
/**
* Gets the terminal width.
*/
public function getWidth(): int
{
$width = getenv('COLUMNS');
if (false !== $width) {
return (int) trim($width);
}
if (!isset(self::$width)) {
self::initDimensions();
}
return self::$width ?: 80;
}
/**
* Gets the terminal height.
*/
public function getHeight(): int
{
$height = getenv('LINES');
if (false !== $height) {
return (int) trim($height);
}
if (!isset(self::$height)) {
self::initDimensions();
}
return self::$height ?: 50;
}
/**
* @internal
*/
public static function hasSttyAvailable(): bool
{
if (isset(self::$stty)) {
return self::$stty;
}
// skip check if exec function is disabled
if (!function_exists('exec')) {
return false;
}
exec('stty 2>&1', $output, $exitcode);
return self::$stty = 0 === $exitcode;
}
private static function initDimensions(): void
{
if ('\\' === DIRECTORY_SEPARATOR) {
if (preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim(getenv('ANSICON') ?: ''), $matches)) {
// extract [w, H] from "wxh (WxH)"
// or [w, h] from "wxh"
self::$width = (int) $matches[1];
self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
} elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {
// only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)
// testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT
self::initDimensionsUsingStty();
} elseif (null !== $dimensions = self::getConsoleMode()) {
// extract [w, h] from "wxh"
self::$width = (int) $dimensions[0];
self::$height = (int) $dimensions[1];
}
} else {
self::initDimensionsUsingStty();
}
}
/**
* Returns whether STDOUT has vt100 support (some Windows 10+ configurations).
*/
private static function hasVt100Support(): bool
{
return function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support(fopen('php://stdout', 'wb'));
}
private static function initDimensionsUsingStty(): void
{
if ($sttyString = self::getSttyColumns()) {
if (preg_match('/rows.(\d+);.columns.(\d+);/i', $sttyString, $matches)) {
// extract [w, h] from "rows h; columns w;"
self::$width = (int) $matches[2];
self::$height = (int) $matches[1];
} elseif (preg_match('/;.(\d+).rows;.(\d+).columns/i', $sttyString, $matches)) {
// extract [w, h] from "; h rows; w columns"
self::$width = (int) $matches[2];
self::$height = (int) $matches[1];
}
}
}
/**
* Runs and parses mode CON if it's available, suppressing any error output.
*
* @return int[]|null An array composed of the width and the height or null if it could not be parsed
*/
private static function getConsoleMode(): ?array
{
$info = self::readFromProcess('mode CON');
if (null === $info || !preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
return null;
}
return [(int) $matches[2], (int) $matches[1]];
}
/**
* Runs and parses stty -a if it's available, suppressing any error output.
*/
private static function getSttyColumns(): ?string
{
return self::readFromProcess('stty -a | grep columns');
}
private static function readFromProcess(string $command): ?string
{
if (!function_exists('proc_open')) {
return null;
}
$descriptorspec = [
1 => ['pipe', 'w'],
2 => ['pipe', 'w'],
];
$process = proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
if (!is_resource($process)) {
return null;
}
$info = stream_get_contents($pipes[1]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);
return $info;
}
}