Pre-commit SVN hook that runs lint

svn-lint.php

#!/usr/local/bin/php
<?php
/**
 * Pre-commit Subversion script.
 *
 * @author Omni Adams <[email protected]>
 */


/**
 * Path to the awk binary.
 */
define('AWK', '/usr/bin/awk');

/**
 * Path to the grep binary.
 */
define('GREP', '/bin/grep');

/**
 * Path to the php binary.
 */
define('PHP', '/usr/local/bin/php');

/**
 * Path to svnlook binary.
 */
define('SVNLOOK', '/usr/bin/svnlook');

/**
 * Divider to inject into error messages to pretty them up.
 */
define('DIVIDER',
    '********************************************************************************');

/**
 * Run PHP lint on every PHP file that changed.
 *
 * If any of the PHP files in the current transaction have lint errors, writes
 * an error message to standard error and returns true.
 * @param string $transaction SVN transaction ID.
 * @param string $repository Full path to the repository.
 * @return boolean True if there was an error.
 */
function runPhpLint($transaction, $repository) {
    $errors = false;
    $changedCommand = SVNLOOK . ' changed -t "'
        . $transaction . '" "'
        . $repository . '" '
        . '| ' . GREP . ' "^[UA]" '
        . '| ' . GREP . ' "\\.php$" '
        . '| ' . AWK . ' \'{print $2}\'';
    exec($changedCommand, $changedOutput);
    foreach ($changedOutput as $file) {
        $lint = array();
        $lintCommand = SVNLOOK . ' cat -t "'
            . $transaction . '" "'
            . $repository . '" "' . $file . '" '
            . '| ' . PHP . ' -l';
        exec($lintCommand, $lint);
        if ('No syntax errors detected in -' == $lint[0]) {
            // Lint returns text on good files,
            // don't write that to standard
            // error or consider it an error.
            continue;
        }
        $message = PHP_EOL . DIVIDER . PHP_EOL . PHP_EOL
            . $file . ' contains PHP error(s):' . PHP_EOL;
        foreach ($lint as $line) {
            // PHP lint includes some blank lines in its output.
            if ('' == $line) {
                continue;
            }
            // PHP lint tells us where the error is,
            // which because we pass it in by piping it
            // to standard in, doesn't tell us anything.
            if ('Errors parsing -' == $line) {
                continue;
            }
            $message .= "\t" . $line . PHP_EOL;
        }
        file_put_contents('php://stderr', $message . PHP_EOL);
        $errors = true;
    }
    return $errors;
}


if (runPhpLint($transaction, $repository)) {
    exit(1);
}

exit(0);

Great gist :)