pre-commit hook for git, running php lint, phpcs and phpmd

pre-commit

#!/usr/bin/php

<?php
// copied from https://gist.github.com/chelmertz/816166
// authored by Travis Swicegood
// modified by Daniel Pinto and Israel Trindade

class Enable
{
    const PHP_LINT = true;
    const PHP_CS = true;
    const PHP_MD = true;

    // Quando true, vai impedir os commits.
    const DEBUG_MODE = true;
}

$output = [];
$return = 0;
exec('git rev-parse --verify HEAD 2> /dev/null', $output, $return);
$against = $return == 0 ? 'HEAD' : '4b825dc642cb6eb9a060e54bf8d69288fbee4904';

exec("git diff-index --cached --name-only {$against}", $output);

// don't check files that aren't PHP
$filename_pattern = '/\.ph(tml|p)$/';
$exclude_patterns = [
    "/\/migrations\//",
    "/\/views\//"
];

$exit_status = 0;

// First we remove those files that does not suit our needs
foreach ($output as $key => $file) {
    foreach ($exclude_patterns as $exclude_pattern) {
        if (preg_match($exclude_pattern, $file)) {
            unset($output[$key]);
            continue 2;
        }
    }

    if (!preg_match($filename_pattern, $file)) {
        unset($output[$key]);
        continue;
    }

    if (!file_exists($file)) {
        // if the file has been moved or deleted,
        // the old filename should be skipped
        unset($output[$key]);
        continue;
    }
}

if (Enable::PHP_LINT) {
    foreach ($output as $file) {
        $lint_output = [];
        exec("git show :" . escapeshellarg($file) . " | php -l ", $lint_output, $return);
        if ($return == 0) {
            continue;
        }

        echo implode("\n", $lint_output), " {$file}\n";
        $exit_status = 1;
    }
}

if ($exit_status != 0) {
    exit($exit_status);
}

if (Enable::PHP_MD) {
    foreach ($output as $file) {
        $md_output = [];
        // Parece que o PHPMD não suporta ler apenas os dados staged.
        //exec("phpmd $(git show :" . escapeshellarg($file) . ") text build/phpmd.xml", $md_output, $return);
        exec("phpmd " . escapeshellarg($file) . " text build/phpmd.xml", $md_output, $return);
        if ($return == 0) {
            continue;
        }

        echo str_replace('STDIN', escapeshellarg($file), implode("\n", $md_output)), "\n";
        $exit_status = 1;
    }
}

// O PHPCS é executado por último, para que suas mensagens fiquem mais visíveis para o usuário.
if (Enable::PHP_CS) {
    foreach ($output as $file) {
        $cs_output = [];
        exec("git show :" . escapeshellarg($file) . " | phpcs -n --standard=build/phpcs_ruleset.xml --encoding=utf-8 --tab-width=4", $cs_output, $return);
        if ($return == 0) {
            continue;
        }

        echo str_replace('STDIN', escapeshellarg($file), implode("\n", $cs_output)), "\n";
        $exit_status = 1;
    }
}

if (Enable::DEBUG_MODE) {
    exit(1);
}

exit($exit_status);