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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\Formatter\OutputFormatterInterface;
use Symfony\Component\Console\Helper\Helper;
use Symfony\Component\Console\Terminal;
/**
* @author Pierre du Plessis <pdples@gmail.com>
* @author Gabriel Ostrolucký <gabriel.ostrolucky@gmail.com>
*/
class ConsoleSectionOutput extends StreamOutput
{
private array $content = [];
private int $lines = 0;
private array $sections;
private Terminal $terminal;
private int $maxHeight = 0;
/**
* @param resource $stream
* @param ConsoleSectionOutput[] $sections
*/
public function __construct($stream, array &$sections, int $verbosity, bool $decorated, OutputFormatterInterface $formatter)
{
parent::__construct($stream, $verbosity, $decorated, $formatter);
array_unshift($sections, $this);
$this->sections = &$sections;
$this->terminal = new Terminal();
}
/**
* Defines a maximum number of lines for this section.
*
* When more lines are added, the section will automatically scroll to the
* end (i.e. remove the first lines to comply with the max height).
*/
public function setMaxHeight(int $maxHeight): void
{
// when changing max height, clear output of current section and redraw again with the new height
$previousMaxHeight = $this->maxHeight;
$this->maxHeight = $maxHeight;
$existingContent = $this->popStreamContentUntilCurrentSection($previousMaxHeight ? min($previousMaxHeight, $this->lines) : $this->lines);
parent::doWrite($this->getVisibleContent(), false);
parent::doWrite($existingContent, false);
}
/**
* Clears previous output for this section.
*
* @param int $lines Number of lines to clear. If null, then the entire output of this section is cleared
*/
public function clear(?int $lines = null): void
{
if (!$this->content || !$this->isDecorated()) {
return;
}
if ($lines) {
array_splice($this->content, -$lines);
} else {
$lines = $this->lines;
$this->content = [];
}
$this->lines -= $lines;
parent::doWrite($this->popStreamContentUntilCurrentSection($this->maxHeight ? min($this->maxHeight, $lines) : $lines), false);
}
/**
* Overwrites the previous output with a new message.
*/
public function overwrite(string|iterable $message): void
{
if (!$this->content || !$this->isDecorated()) {
$this->writeln($message);
return;
}
// Replace own content and write everything in a single cursor-up + erase
// pass, to avoid the flicker (and the line-eating artifacts on some
// terminals) caused by calling clear() then writeln() back-to-back.
$linesCleared = $this->lines;
$this->content = [];
$this->lines = 0;
if (!is_iterable($message)) {
$message = [$message];
}
foreach ($message as $line) {
$this->addContent($this->getFormatter()->format($line) ?? '', true);
}
$erasedContent = $this->popStreamContentUntilCurrentSection($this->maxHeight ? min($this->maxHeight, $linesCleared) : $linesCleared);
parent::doWrite($this->getVisibleContent(), false);
parent::doWrite($erasedContent, false);
}
public function getContent(): string
{
return implode('', $this->content);
}
public function getVisibleContent(): string
{
if (0 === $this->maxHeight) {
return $this->getContent();
}
return implode('', \array_slice($this->content, -$this->maxHeight));
}
/**
* @internal
*/
public function addContent(string $input, bool $newline = true): int
{
$width = $this->terminal->getWidth();
$lines = explode(\PHP_EOL, $input);
$linesAdded = 0;
$count = \count($lines) - 1;
foreach ($lines as $i => $lineContent) {
// re-add the line break (that has been removed in the above `explode()` for
// - every line that is not the last line
// - if $newline is required, also add it to the last line
if ($i < $count || $newline) {
$lineContent .= \PHP_EOL;
}
// skip line if there is no text (or newline for that matter)
if ('' === $lineContent) {
continue;
}
// For the first line, check if the previous line (last entry of `$this->content`)
// needs to be continued (i.e. does not end with a line break).
if (0 === $i
&& (false !== $lastLine = end($this->content))
&& !str_ends_with($lastLine, \PHP_EOL)
) {
// deduct the line count of the previous line
$this->lines -= (int) ceil($this->getDisplayLength($lastLine) / $width) ?: 1;
// concatenate previous and new line
$lineContent = $lastLine.$lineContent;
// replace last entry of `$this->content` with the new expanded line
array_splice($this->content, -1, 1, $lineContent);
} else {
// otherwise just add the new content
$this->content[] = $lineContent;
}
$linesAdded += (int) ceil($this->getDisplayLength($lineContent) / $width) ?: 1;
}
$this->lines += $linesAdded;
return $linesAdded;
}
/**
* @internal
*/
public function addNewLineOfInputSubmit(): void
{
$this->content[] = \PHP_EOL;
++$this->lines;
}
protected function doWrite(string $message, bool $newline): void
{
// Simulate newline behavior for consistent output formatting, avoiding extra logic
if (!$newline && str_ends_with($message, \PHP_EOL)) {
$message = substr($message, 0, -\strlen(\PHP_EOL));
$newline = true;
}
if (!$this->isDecorated()) {
parent::doWrite($message, $newline);
return;
}
// Check if the previous line (last entry of `$this->content`) needs to be continued
// (i.e. does not end with a line break). In which case, it needs to be erased first.
$linesToClear = $deleteLastLine = ($lastLine = end($this->content) ?: '') && !str_ends_with($lastLine, \PHP_EOL) ? 1 : 0;
$linesAdded = $this->addContent($message, $newline);
if ($lineOverflow = $this->maxHeight > 0 && $this->lines > $this->maxHeight) {
// on overflow, clear the whole section and redraw again (to remove the first lines)
$linesToClear = $this->maxHeight;
}
$erasedContent = $this->popStreamContentUntilCurrentSection($linesToClear);
if ($lineOverflow) {
// redraw existing lines of the section
$previousLinesOfSection = \array_slice($this->content, $this->lines - $this->maxHeight, $this->maxHeight - $linesAdded);
parent::doWrite(implode('', $previousLinesOfSection), false);
}
// if the last line was removed, re-print its content together with the new content.
// otherwise, just print the new content.
parent::doWrite($deleteLastLine ? $lastLine.$message : $message, true);
parent::doWrite($erasedContent, false);
}
/**
* At initial stage, cursor is at the end of stream output. This method makes cursor crawl upwards until it hits
* current section. Then it erases content it crawled through. Optionally, it erases part of current section too.
*/
private function popStreamContentUntilCurrentSection(int $numberOfLinesToClearFromCurrentSection = 0): string
{
$numberOfLinesToClear = $numberOfLinesToClearFromCurrentSection;
$erasedContent = [];
foreach ($this->sections as $section) {
if ($section === $this) {
break;
}
$numberOfLinesToClear += $section->maxHeight ? min($section->lines, $section->maxHeight) : $section->lines;
if ('' !== $sectionContent = $section->getVisibleContent()) {
if (!str_ends_with($sectionContent, \PHP_EOL)) {
$sectionContent .= \PHP_EOL;
}
$erasedContent[] = $sectionContent;
}
}
if ($numberOfLinesToClear > 0) {
// move cursor up n lines
parent::doWrite(\sprintf("\x1b[%dA", $numberOfLinesToClear), false);
// erase to end of screen
parent::doWrite("\x1b[0J", false);
}
return implode('', array_reverse($erasedContent));
}
private function getDisplayLength(string $text): int
{
return Helper::width(Helper::removeDecoration($this->getFormatter(), str_replace("\t", ' ', $text)));
}
}