PHPMD Git pre-commit hook with parallell checks thanks to Node.js

gistfile1.js

#!/usr/bin/env node

var child_process = require('child_process'),
  spawn = child_process.spawn,
  exec = child_process.exec,
  quitOnError = null, rules;

function checkFiles() {
  if (quitOnError === null || !rules) {
    return;
  }
  var gitPhpmd = spawn('git', ['phpmd', rules])
  gitPhpmd.stdout.on('data', function (data) {
    process.stdout.write(data);
  });
  gitPhpmd.on('exit', function (code) {
    if (quitOnError) {
      setTimeout(function () {
        process.exit(code);
      }, 10);
    }
  });
}

exec('git config hooks.phpmdstoponerror', function (error, stdout) {
  if (error === null) {
    quitOnError = (stdout.trim() != '0');
    checkFiles();
  }
  else {
    quitOnError = false;
  }
});
exec('git config hooks.phpmd', function (error, stdout) {
  if (error === null) {
    rules = stdout.trim();
    checkFiles();
  }
});

git-phpmd

#!/bin/bash
# Uses multiphpmd from https://github.com/voxpelli/node-multiphpmd
git diff --name-only --staged | multiphpmd $1