Git pre-commit hook for PHP+JS+CSS (Gaia version)

pre-commit

#!/usr/bin/env php
<?php
 
$output             = array();
$errorOutput        = array();
$return             = 0;
$pathToErrorFile    = 'temp/minify_errors.txt';
file_put_contents($pathToErrorFile, '');
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);
 
$exit_status = 0;

ob_start();
foreach ($output as $file) {
    if (!is_readable($file)) {
        continue; // if the file isn't readable,.. we can't syncheck it.  SKIP to the next file to check.
    }
    $returnVal      = 0;
    $resultLines    = array();
    $phpsyn_failed  = false;
    $extension      = strrchr($file, '.');

    if (0 === strcmp($extension, '.php')) {
        // validation of PHP files
        $lint_output    = array();
        exec("phpsyn " . escapeshellarg($file), $resultLines, $returnVal);
        if ($returnVal === 0) {
            continue;
        }
        $exit_status    = 1;
        $phpsyn_failed  = true;
    } else if (0 === strcmp($extension, '.js')) {
        // validation of JS files

        // minification of JS files
        exec('dev/minify/minify ' . escapeshellarg($file) . " -f 2>&1", $resultLines, $returnVal);
    } else if (0 === strcmp($extension, '.css')) {
        // validation of CSS files

        // minification of CSS files
        exec('dev/minify/minify ' . escapeshellarg($file) . " -f 2>&1", $resultLines, $returnVal);
    }

    // if there was an error, give the devloper some useful information and set the Exit status to be non-zero
    if (0 !== $returnVal) {
        $systemCommandResults = array();
        $exit_status        = $returnVal;
        for($i = 0; $i < count($resultLines); $i++) {
            if(0 === strcmp($extension, '.php')) {
                // only echo the lines with 'error: ' in the text (phpsyn error format)
                if(FALSE !== strpos($resultLines[$i], 'error: ')) {
                    $errorOutput[] = $file . ': ' . trim($resultLines[$i]);
                }
            } else {
                // only echo the lines with '[ERROR]' in the text (JSLint error format)
                if(FALSE !== strpos($resultLines[$i], '[ERROR]')) {
                    $errorOutput[] = $file . ': ' . trim($resultLines[$i]);
                }
            }
        }
        if ($phpsyn_failed) {
            echo implode("\n", $resultLines) . "\nPHP SYNTAX CHECK FAILED.  SEE NOTES ABOVE.\n";
        }
    }
}
ob_end_clean();

if (0 !== $exit_status) { // display a summary message at the bottom of the output
    echo "\n" . implode("\n", $errorOutput);
    echo "\n\n" . 'There was an error during pre-commit.  See above.' . "\n";
}
exit($exit_status);