PrettierPHPFixer.php

<?php

use PhpCsFixer\Fixer\FixerInterface;
use PhpCsFixer\Tokenizer\Tokens;
use Symfony\Component\Filesystem\Filesystem;

/**
 * Fixer for using prettier-php to fix.
 */
final class PrettierPHPFixer implements FixerInterface
{
    /**
     * {@inheritdoc}
     */
    public function getPriority()
    {
        // Allow prettier to pre-process the code before php-cs-fixer
        return 999;
    }

    /**
     * {@inheritdoc}
     */
    public function isCandidate(Tokens $tokens)
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function isRisky()
    {
        return false;
    }

    /**
     * {@inheritdoc}
     */
    public function fix(SplFileInfo $file, Tokens $tokens)
    {
        if (
            0 < $tokens->count() &&
            $this->isCandidate($tokens) &&
            $this->supports($file)
        ) {
            $this->applyFix($file, $tokens);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'Prettier/php';
    }

    /**
     * {@inheritdoc}
     */
    public function supports(SplFileInfo $file)
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    private function applyFix(SplFileInfo $file, Tokens $tokens)
    {
        $tmpFile = $this->getTmpFile($file);
        exec(
            "yarn exec -- prettier --write --tab-width=4 --single-quote=true --trailing-comma-php=php7.3 $tmpFile"
        );

        $content = file_get_contents($tmpFile);
        $tokens->setCode($content);

        (new Filesystem())->remove($tmpFile);
    }

    /**
     * Create a Temp file with the same content as given file.
     *
     * @param SplFileInfo $file file to be copied
     *
     * @return string tmp file name
     */
    private function getTmpFile(SplFileInfo $file): string
    {
        $fileSys = new Filesystem();
        $tmpFolderPath = __DIR__ . DIRECTORY_SEPARATOR . 'tmp';
        $fileSys->mkdir($tmpFolderPath);

        $tmpFileName = str_replace(
            array(DIRECTORY_SEPARATOR, ':'),
            '_',
            $file->getRealPath()
        );
        $tmpFilePath =
            $tmpFolderPath . DIRECTORY_SEPARATOR . '__' . $tmpFileName;
        $fileSys->copy($file->getRealPath(), $tmpFilePath, true);
        return $tmpFilePath;
    }
}