Restore empty lines after rector

restore-empty-lines.php

<?php

declare(strict_types=1);

exec('git diff', $diff);

$currentFile = $chunkStart = null;
$fileChanged = false;
$chunkOffset = 0;
$fileLines = [];

foreach ($diff as $line) {
    if (str_starts_with($line, '---')) {
        if ($fileChanged) {
            updateFile($currentFile, $fileLines);
        }

        $currentFile = str_replace('--- a/', '', $line);
        $fileLines = explode("\n", file_get_contents($currentFile));
        $fileChanged = false;
        continue;
    }

    if (str_starts_with($line, '@@')) {
        preg_match('/@@ -(\d+),(\d+) \+(\d+),(\d+) @@/', $line, $matches);
        $chunkStart = (int) $matches[3];
        $chunkOffset = 0;
        continue;
    }

    if (str_starts_with($line, '-')) {
        // Empty line removed
        if ($line === '-') {
            array_splice($fileLines, $chunkStart + $chunkOffset - 1, 0, '');
            ++$chunkOffset;
            $fileChanged = true;
        }
    } else {
        ++$chunkOffset;
        continue;
    }
}

if ($fileChanged) {
    updateFile($currentFile, $fileLines);
}

function updateFile($file, $lines): void
{
    file_put_contents($file, implode("\n", $lines));
}