Drupal Git pre-commit

#!/usr/bin/php
<?php
/**
 * @file
 * If this file has an exit status other than 0, the commit will fail.
 */
 
// For each check, set to 1 to enable or 0 to disable.
$check_unwanted_strings = 1;
$check_grunt = 1;
$check_gulp = 1;
 
//////
// There should be no reason to edit anything below this line.
//////
 
$diff = get_diff();
 
// Disallows commit if git diff returns an error.
if (diff_error($diff)) {
  exit(1);
}
// Disallows commit if the diff contains an unwanted string.
if ($check_unwanted_strings && contains_unwanted_string($diff)) {
  exit(1);
}
// Disallows commit if grunt is running.
if ($check_grunt && grunt_is_running()) {
  exit(1);
}
// Disallows commit if gulp is running.
if ($check_grunt && gulp_is_running()) {
  exit(1);
}
exit(0);
 
/**
 * Returns the git diff as an array of lines.
 */
function get_diff() {
  $return = 0;
  $diff = array();
  exec('git diff && git diff --staged', $diff, $return);
  if ($return !== 0) {
    $diff = array();
  }
  return $diff;
}
 
/**
 * Checks for error in diff.
 */
function diff_error($diff) {
  $return = 0;
  if (empty($diff)) {
    fwrite(STDOUT, "git diff returned an error. Commit aborted.\n");
    $return = 1;
  }
  return $return;
}
 
/**
 * Checks for unwanted strings.
 */
function contains_unwanted_string($diff) {
  $return = 0;
  // Lowercase only.
  $checks = array(
    'dsm(',
    'dpm(',
    'sdpm(', // search_krumo
    'dpr(',
    'dprint_r(',
    'db_queryd(',
    'kpr(',
    'kprint_r(',
    'var_dump(',
    'error_log(',
    'drupal_debug(',
    'temppp',
    'console.log',
    'debugger;',
  );
 
  foreach ($diff as $lineno => $line) {
    // Skips the line if it's not an addition line.
    if (substr($line, 0, 1) != '+') {
      continue;
    }
    // Checks each line in the diff for unwanted strings.
    foreach ($checks as $check) {
      if (strstr(strtolower($line), $check)) {
        fwrite(STDOUT, "You were about to commit a $check \n");
        fwrite(STDOUT, "Offending line in diff:\n");
        fwrite(STDOUT, "Line: $lineno $line\n");
        fwrite(STDOUT, "Commit aborted.\n");
        $return = 1;
        break 2;
      }
    }
  }
  return $return;
}
 
/**
 * Checks if grunt is running.
 */
function grunt_is_running() {
  $return = 0;
  $output = array();
  exec('killall -s "grunt" &> /dev/null && if [ $? -eq 0 ]; then echo 1; fi', $output);
  if (!empty($output)) {
    fwrite(STDOUT, "Commit aborted: Grunt is running. \n");
    $return = 1;
  }
  return $return;
}
 
/**
 * Checks if gulp is running.
 */
function gulp_is_running() {
  $return = 0;
  $output = array();
  exec('killall -s "gulp" &> /dev/null && if [ $? -eq 0 ]; then echo 1; fi', $output);
  if (!empty($output)) {
    fwrite(STDOUT, "Commit aborted: Gulp is running. \n");
    $return = 1;
  }
  return $return;
}