TrimmedBufferOutput.php
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TrimmedBufferOutput.php
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	<?php

	/*
	* This file is part of the Symfony package.
	*
	* (c) Fabien Potencier <fabien@symfony.com>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/

	namespace Symfony\Component\Console\Output;

	use Symfony\Component\Console\Exception\InvalidArgumentException;
	use Symfony\Component\Console\Formatter\OutputFormatterInterface;

	/**
	* A BufferedOutput that keeps only the last N chars.
	*
	* @author Jérémy Derussé <jeremy@derusse.com>
	*/
	class TrimmedBufferOutput extends Output
	{
	private int $maxLength;
	private string $buffer = '';

	public function __construct(int $maxLength, ?int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = false, ?OutputFormatterInterface $formatter = null)
	{
	if ($maxLength <= 0) {
	throw new InvalidArgumentException(\sprintf('"%s()" expects a strictly positive maxLength. Got %d.', __METHOD__, $maxLength));
	}

	parent::__construct($verbosity, $decorated, $formatter);
	$this->maxLength = $maxLength;
	}

	/**
	* Empties buffer and returns its content.
	*/
	public function fetch(): string
	{
	$content = $this->buffer;
	$this->buffer = '';

	return $content;
	}

	protected function doWrite(string $message, bool $newline): void
	{
	$this->buffer .= $message;

	if ($newline) {
	$this->buffer .= \PHP_EOL;
	}

	$this->buffer = substr($this->buffer, -$this->maxLength);
	}
	}