php QC pre-commit hook

PreCommitHook.php

#!/usr/bin/php
<?php

/**
 * Git pre-commit hook for PHP code quality
 * install with `<path-to-file> install`
 */
class PreCommitHook
{
    /**
     * @var string[]
     */
    protected $files;

    public function __construct()
    {
        exec('git diff-index --cached --name-only HEAD', $files);
        $this->files = $files;
    }

    public function install()
    {
        $this->testCommand('ln -s -r ' . escapeshellarg(__FILE__) . ' .git/hooks/pre-commit');

        return 0;
    }

    public function testCommand($command)
    {
        exec($command, $output, $result);

        if ($result !== 0) {
            $this->failWithMessage($output, $result);
        }
    }

    public function failWithMessage($message, $exitStatus = 1)
    {
        if (is_array($message)) {
            $message = implode(PHP_EOL, $message);
        }

        echo $message;
        exit(1);
    }

    public function getFiles($match = null)
    {
        if ($match === null) {
            return $this->files;
        }

        $matchedFiles = [];
        foreach ($this->files as $file) {
            if (preg_match($match, $file)) {
                $matchedFiles[] = $file;
            }
        }

        return $matchedFiles;
    }
}


$hook = new PreCommitHook();

if ($argc == 2 && $argv[1] == 'install') {
    $hook->install();
    exit();
}

echo 'Executing PHP Lint...' . PHP_EOL;
foreach ($hook->getFiles('/\.php$/') as $file) {
    $hook->testCommand('php -l ' . escapeshellarg($file));
}

echo 'Executing PHP CS...' . PHP_EOL;
foreach ($hook->getFiles('/\.php$/') as $file) {
    $hook->testCommand('vendor/bin/phpcs --extensions=php -n --standard=PSR2 ' . escapeshellarg($file));
}

echo 'Executing PHP STAN...' . PHP_EOL;
foreach ($hook->getFiles('/\.php$/') as $file) {
    $hook->testCommand('vendor/bin/phpstan analyze --level=4 ' . escapeshellarg($file));
}