KevinGH\RequirementChecker\Terminal

Complexity

Total Complexity

32

Size/Duplication

Total Lines	150
Duplicated Lines	0 %

Importance

Changes

0

9 Methods

Rating	Name	Duplication	Size	Complexity
A	initDimensionsUsingStty()	0	11	4
A	hasVt100Support()	0	3	2
A	hasSttyAvailable()	0	14	3
A	getSttyColumns()	0	3	1
A	getHeight()	0	12	4
A	getConsoleMode()	0	9	3
B	initDimensions()	0	19	8
A	readFromProcess()	0	22	3
A	getWidth()	0	12	4

<?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;
    }
}