get the lines existing per user in a git repo

git-line-count.js

#!/usr/bin/env node

var child_process = require('child_process'),
  users = {},
  c = 0,
  modes = ['100644', '100664', '100755'];

function blameFile(file, i) {
  setTimeout(function () {
  child_process.exec('git blame ' + file, function (error, stdout, stderr) {
    var lines = stdout.split('\n'),
      j = lines.length,
      user;

    c -= 1;

    while (j) {
      j -= 1;
      line = lines[j];
      user = line.replace(/^\^?[a-f0-9]{7,8}[^\(]*\(/, '').replace(/[0-9]{4}\-[0-9]{2}\-[0-9]{2}.*$/g, '');
      user = user.replace(/\s+?$/g, '');

      if (users.hasOwnProperty(user)) {
        users[user] += 1;
      } else {
        users[user] = 1;
      }
    }

    process.stdout.write('.');

    if (!c) {
      console.log('');
      console.log(users);
    }
  });
  }, i * 150);
}

child_process.exec('git ls-tree --full-tree -r master', function (error, stdout, stderr) {
  var files = stdout.split('\n'),
    i = files.length;
  c = files.length;

    while (i) {
      i -= 1;
      if (modes.indexOf(files[i].substr(0, 6)) === -1 || (/\.(png|jpg|gif|ico|jar|pickle|json|pyc)$/).test(files[i])) {
        c -= 1;
        continue;
      }
      blameFile(files[i].substr(53), i);
    }
});